Category Archives: Shrubs & Trees

What To Do With All Those Fall Leaves?

by Judy Bernard, Master Gardener

What to do with leaves? It used to be that one would rake the leaves, put them into bags to be collected by the municipality, where they would often be put into landfill or composting. They are a rich source of organic material for the garden that helps retain moisture in the soil.

I have a friend that collects leaves that fall on her lawn, bags them and uses them the next spring in her vegetable garden. They first mulch them into the lawn, then, what remains is collected into bags and stored until spring. The leaves are spread between the rows of her vegetable garden in the spring and watered down. When the tender vegetable plants have sprouted, she then uses the leaves to mulch around all of her veggies. By fall there are no more leaves, just rich organic material in the soil for next years garden.

The leaves can also be used to protect tender perennials by covering them with a blanket for the winter. Indeed, mulch all of your perennial beds with leaves in the fall to protect them from winter extremes. And don’t be in a hurry to uncover them in the spring.

I’ve included a couple of links to give you other ideas of how to use this valuable resource.

Things to do with fall leaves

What to do with fall leaves

Waiting for top soil and sod for our new home, I’ve “planted” pots with my shrubs, tulip tree and peonies into the fill along the side of the house. I collected some bags of leaves along the roadside and have mulched the pots for the winter.

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September in the Garden

By Mary-Jane Pilgrim, Master Gardener

Fall is in the air.  You can see the days getting shorter, and feel that the temperatures are cooling.  The Canada Geese are grouping; ready to make their noisy trip south.  The boats and camping trailers are also heading south.  The monarchs will soon be leaving us for sunnier climates in Mexico.  It’s that time of year where every living thing in our region starts preparing for the colder seasons to come.monarch2015

In the garden, fall is a great time for planting, dividing, weeding, mulching and planning for spring renovations.  The soil is warm, the days are cooler and the rain is usually frequent.  These three items are a big part of what is needed to get new plantings well established before the snow flies.

Fall Planting

Now is the time to plant buy and plant spring-flowering bulbs like tulips, daffodils, allium, snowdrops and crocus.  Shop early for the best selection.  If you are plagued by squirrels, know that they do not go after daffodils — so fill your basket with these instead of some of the more delicious bulbs like tulips that may just make a tasty snack.

Now is also a great time to plant late season annuals like pansies, kale and cabbage for garden bed interest or for front door planters.  It’s also prime tree and shrub planting time.  Water well until freeze-up.

Fall Dividingrudbeckia

September is a great time to divide some of those perennials that have outgrown their space, or that you’d like to share with others.  Watch for obvious division points for hosta, black-eyed susans, coneflower, iris and daylilies.  Plants will have enough time to establish roots in their new homes if this splitting and replanting is done now.  After splitting, cut back any unnecessary leaves or flower stalks from these to make the transition a little easier for these perennials.

Fall Weeding

Many of us have lost interest in this task by now.  However, if you consider that every weed that remains in your beds is likely to go to seed, and that most weeds carry hundreds of seeds, it’s totally in your best interest to keep those beds as weed-free as possible.  For me, this includes deadheading any self-seeding perennials as well.

Fall Mulching

Add some compost, and a two- to three-inch layer of mulch to beds to get them ready for winter. It’s like putting the comforter on the bed.  You can use garden-centre mulch for this, but I have a neighbour with mature maple trees that provide all of the leaves that I can use.  Leaves are great insulator, and best of all, they’re completely free!

Spring Renovation Planning

Lastly, fall is a great time for you to assess areas of the garden which may need renovation next spring.  I sometimes draw maps of the different plants in my garden beds, and it’s not uncommon to see the words “remove”, “divide” and “move” scrawled across these drawings. You may think that you’ll remember all of this next spring, but I have my bets against you on this one!

Here’s to some great fall preparation to make next spring just a little bit more organized and successful.

Tamarack or Larch?

By Christine Freeburn, Master Gardener

Many of you may have noticed the amazing yellow shades of the tamarack trees last October. They absolutely glowed in the landscape after the maple, oak and other deciduous trees had dropped their colourful leaves.tamarack-trees-208125_960_720

Tamarack and larches are from the Pinaceae family and the Larix genus with different species names to differentiate themselves. They are deciduous conifers, meaning they are evergreens that drop their needles in winter. Their bark seems flaky with reddish undertones. Leaves or needles are a light bluish green turning a bright yellow in autumn. They grow in whorls or tufts around the branch and give the tree a soft fluffy appearance. Cones are small.

European Larch is Larix decidua which grows here in the east. It tends to have droopy branches and grows in fields and open areas as it likes sun. Its needles tend to be a bit longer than the Tamarack needles and it’s cones are bigger.

Tamarack is Laris laricina which grows here in wet swampy areas in full sun. It is native to Canada.

Larch can live up to 850 years and grow 260′ tall while Tamarack are smaller, growing only 65′ high.larch-163340_960_720

There are several dwarf cultivars created for the home garden, however these trees do not do well in cities where they suffer from air pollution.

A strong softwood, Tamarack means ‘wood used for snowshoes’ in the Algonguin language.

Western Larch L.occidentalis grows in western Canada.

Watch for these bright pops of colour this fall.

Mulch–Do you love it or hate it?

By Cheryl Harrison, Master Gardener

Mulch may be used as a noun or as a verb.  I make a list to pick up some “mulch” (noun) at the garden centre so that I can come home and “mulch” (verb) my flower garden.

I mulch my gardens including my vegetable garden, my flower gardens and my container gardens. Mulch is amazing and is even used by mother nature without any human intervention. If you walk through a pine forest, you will notice that the pine needles are in a thick layer on the forest floor. Mother nature does this for a reason!

Benefits of Mulch

Mulch helps to:

  • moderate soil temperature – it keeps soil cooler in summer and warmer in winter.
  • reduce weed growth – covers the soil to reduce sunlight for weed seed germination and weakens growth of sprouted weeds.
  • retain moisture – it provides protection from drought.
  • build good soil structure and improve soil texture as it decomposes.
  • protect the soil – reduce erosion by water and wind.
  • protect plant foliage from soil splash which can transfer fungus to the leaves of plants.

There are so many types of mulch to choose from that there is sure to be something to suit every gardener.

Organic Mulch

pine needle mulch
Pine needle mulch – waiting for plants. South Carolina garden. 
  • Adds nutrients to the soil as it decomposes, living mulches may be fragrant and attract pollinators.
  • Grass clippings, dried shredded fall leaves, leaf mould, conifer needles, clean straw or hay, wood chips or sawdust, shredded newspapers, shredded bark, coconut/nut husks, finished compost, cover crops, creeping groundcover perennials (eg. Thyme – covers the ground well and it flowers) or even closely planted gardens.

Inorganic Mulch

stone mulch
Stone mulch, author’s garden
  • Permanent, does not break down easily and does not add nutrients to the soil.
  • Geotextiles (landscape fabric), plastic and stone.

 

Mulch Application

Yes, mulching your gardens is work but the benefits are definitely worth it.

Apply mulch to damp soil, 5-10 cm (2-4 inches) deep using a shovel, a garden fork or a bucket. It really depends on the type of mulch which tool will work the best for you.

Do not cover the crown (centre of plant where the stems originate) or mulch right up to the trunk of your trees. You may smother your plant if you cover it with mulch or attract insects to your tree’s trunk if you mulch too close. You will need to re-apply organic mulch every couple of years as it breaks down and becomes part of the garden soil.

Purchasing Mulch

Mulch may be purchased in bulk or in bags. Be sure to ask questions about the product. You want mulch that is free of weed seeds and disease. If you prefer dyed mulch, you will want mulch where the dye used is not poisonous to you or the other critters in your garden.

Oh, I forgot one of the most important benefits of mulch … your soil and your plants are healthy and happy, so enjoy those beautiful gardens!

authors garden
Author’s garden

The Light in Your Garden

by Chris Freeburn, Master Gardener

Growing any plant successfully in your garden depends on many factors and an important one is the amount of light you get throughout the day. Growing Hosta out in the blazing sunshine is fine when they first emerge in springtime, but most Hosta will fry with the hot summer sun all day long. A peony without enough sun will have lovely green leaves, but will probably not give you any flowers.

Take a day or two to notice when your flower beds are in sun and for how long. Full sun means at least 6 hours of sun a day. Full shade means no direct sun. Part sun should only be about 3 hours. Morning sun is the best as it is not harsh and hot like late afternoon sun, so if you have gardens facing east, you have the best light for most plants.

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Knowing which direction your home sits is important too. Get your orientation fixed in your mind. Remember that trees and buildings will shade the gardens as the sun moves throughout the day. As the seasons change, the sun will move slightly in its orientation and where the sunlight comes from will change. Be prepared when you go plant shopping, read plant tags and talk to experts to be sure you are putting the right plant in the right place for the right light requirements.

Like growing just outside your garden growing zones, gardeners can also grow outside sun requirements. Hybridizing has enabled us to have plants that will grow outside their normal light needs. For instance, there are now Hosta that will take a lot of sun. Try to stretch the limits if you want that certain plant in that certain place, but remember to monitor it to be sure it is not being stressed and is performing at its best.

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Lighting may change in your garden. If a big tree is removed, a full shade garden can become a full sun garden. As a tree grows in your or your neighbour’s yard, or if a new building goes up, it will become more shaded. You may find that you will have to relocate plants when this happens.

Spend more time in your garden, just watching. It is good for your education and good for your soul.

GreenUP Ecology Park Spring Sale

By Suzanne Seryck, Master Gardener

GreenUP Ecology Park Spring Sale – Saturday May 18th 2019

The GreenUP Ecology Park  has often been called a hidden gem, it has been in Peterborough in its current location for 25 years, but many people are still unaware of its existence. I first discovered the park approximately 8 years ago when I was researching native plants. At that time I wanted to plant a large perennial bed filled exclusively with native plants. I spent all winter researching the plants I wanted and where I could buy them locally and came across the Ecology Park and better still discovered they were holding a spring sale.

I dutifully arrived on the day of the sale 5 minutes after opening only to discover a very, very long line of people all carrying totes, boxes, bags, anything that could be used to carry plants. Even though it was incredible busy I was able to find almost everything on my list with help from the many knowledgeable volunteers and staff that were on hand to help. I was quickly and efficiently processed through the payment line, and was soon on my way home to start planting. The quality and choice of plants was extensive, and I knew then that I had found something special. I have been returning to the Ecology Park every year since either as a customer or as a volunteer.

plantsalecourtesyofGreenUpFBpage

Native plants are plants that grow locally in a particular area. Whether you are planting an entire garden of native plants or simply planting one or two, the benefits are numerous. Native plants tends to be more hardy to the local conditions, needing less watering, and next to no pesticides or fertilizers. They can improve air quality, help in managing rain water runoff and maintain healthy soil as their root systems are deep and help prevent soil from compaction and erosion. Native plants provide both habitat and food sources for wildlife, as many native pollinators rely on native plants. There are numerous interesting articles on the internet detailing the benefits of planting with native plants – I have listed a few below. There are also links to two other native plant nurseries (in addition to Ecology Park).

Why Native Plants Matter
Benefits of Native Plants
List of Native Plants in Ontario
(from Ontario Wildflowers – a comprehensive list)

Native Plants in Claremont
Ontario Native Plants (online only – ship from Hamilton)

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This year the GreenUP Ecology Park Spring Sale is being held on Saturday May 18th from 10 am until 4 pm. As well as trees, shrubs and wildflowers you can also buy vegetables and annuals at the sale along with compost, mulch and wood chips, but make sure you bring your own containers to hold the compost or mulch. A list of available trees, shrubs, wildflowers and grasses is available on the Ecology Park website.

Children are welcome, even encouraged. While you shop there is a large children’s play area complete with a willow trail and cedar maze to keep them entertained. Be sure to check out the latest addition to the park, the new children’s education shelter which has been built using sustainable practices.

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And finally, the Peterborough Master Gardeners will be on hand wearing their red aprons between 10 am and 2 pm to answer any gardening questions you might have. Be sure to stop by and say hello!

The Peterborough Garden Show

By Mary-Jane Pilgrim, Master Gardener

It’s coming in 25 days.  It can’t come soon enough.  In our city, “The Garden Show” is a true sign of spring.  It’s an occasion that brings together speakers, workshop leaders, vendors, horticultural society members, master gardeners, exhibitors and many others for one reason:  “For the Love of Gardening”.PGS-logo-small

This year marks the 19th fantastic show: 
April 26 – 28, 2019 (Friday 5-9pm, Saturday 10am-5pm & Sunday 10am-4pm).

And there’s great news ! The show has MOVED – to Fleming College’s brand new Trades and Technology Centre on Brealey Drive with lots of FREE parking and a $10, one-price ticket so you can enjoy the show all weekend.

The Peterborough and Area Master Gardeners will have a booth at the show, and will be happy to answer any gardening questions that you may have. Watch for our red aprons!

The theme “Coming Up Roses” is reflected in several of the amazing speakers along with educational and fun workshops and demos.

This award-winning show was honoured in 2017 with both a “Canada 150 Garden Experience”, and “Garden Event of the Year” by the Canadian Garden Council, so come and see what all the fuss is about.

You will find many of your old favourite vendors along with some new ones.

…and don’t forget the popular “Little Green Thumbs” Children’s Garden that is always teaming with liveliness and action! There are learning activities, face painting, crafts and even a take-home project. Their theme this year is “Miniature Gardens for Elves and Fairies”.

All the show profits go back into our community to fund scholarships for post-secondary students studying in horticulture-related fields,various local projects & Community Gardens.  Since 2002, the show has put over $200,000 back into our community.

Please save the date, visit and and learn why “Everything’s Coming Up Roses” in 2019.

Learn more about the incredible speakers, workshops, bus trips, places to stay and tickets here: peterboroughgardenshow.com.

 

Truth or Fiction? Are Black Walnuts Toxic in my Garden?

by Emma Murphy, Master Gardener

As a Master Gardener, one of the most common questions I get asked is about the toxicity of walnut trees (Juglans nigra).

“Well I heard that the juglone stuff in the roots kills everything and that I can’t plant anything under or anywhere near a walnut tree.”

Well yes Virginia, you can plant a garden under a walnut tree, and have it thrive. Let’s look at Exhibit 1 below – an established perennial bed under a walnut tree. It’s at our house, so I guarantee it’s real, and it’s been there since late 2007.

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Lots of lovely perennials here – hostas (Hosta spp.), daylilies (Hemerocallis), bearded iris (Iris germanica), summer phlox (Phlox paniculata), wild ginger (Asarum canadense), purple coneflower (Echinacea purpurea), ditch lilies (Hemerocallis fulva), although those last ones are doing just a little too well LOL. Don’t believe it’s a walnut tree? Here’s a photo from a bit further back on the street.

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Yes, she’s a big old lady – we think she was planted around the same time the house was built, making her about 140 years old. I think she’s getting a bit tired out – most years she doesn’t produce too many walnuts. Her slightly younger cousin is to the left of the barn in the background – LOTS of walnuts off her (and yes a garden under that one too).

So where does this fallacy come from that ‘nothing grows under a walnut’? Well certainly all parts of the walnut tree contain a chemical called juglone (heck it’s even in the Latin name!). Juglone is a chemical that affects other plants growing nearby (a phenomenon called allelopathy). Simply put, allelopathy involves “living or dead plant parts that release chemicals into the soil which have an effect on other plants—positive or negative.” For walnuts it seems like an attempt at self preservation, with juglone acting like a natural herbicide on other plants.

As Professor Linda Chalker-Scott explains in her recent (2019) peer-reviewed Washington State University Extension paper, damage to tomatoes and other crops near walnut trees in the 1920s caused people to believe that toxic chemicals were involved, and this perception persisted and became widespread despite there being no evidence (and this was before social media existed!). The US Department of Agriculture did field testing – no problems. When applied in a laboratory setting to seeds and seedlings it did cause stunting, wilting, and necrosis, but the specific way it did this was unclear. The most recent science suggests that juglone disrupts photosynthetic and respiratory pathways and interferes with water uptake in plants.

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So! It does affect plants – the laboratory says so. Well yes, and no. Field tests do not support the laboratory work, which doesn’t accurately mimic real life conditions in your average residential garden (again, for more detail read the excellent paper referenced above). Two very old University Extension papers (1973 and 1993) continue to be used to state which plants are ‘sensitive’ and which are ‘tolerant’. However these were simply observational papers—meaning that they correlate the presence of walnut trees with damage to other species but do not confirm a causative relationship. Neither should be considered good scientific evidence.

Gardening With Walnut Trees – My Story

I am sure the scientists, arboretums, farmers, and garden writers will continue to debate this topic for a while. Meanwhile, here’s our story. In 2007 I wanted a garden bed under our black walnut in my front yard. At the time I had heard the walnut horror stories, so I thought – well, how about I just don’t disturb the roots of the tree? (not a good thing to do when establishing any garden beds under a tree). I put good topsoil and compost down, making sure to minimize tearing up of the soil and roots, and planted, and watered, and waited. Things grew. Winter happened. Next spring plants came up. For the most part I just moved perennials that were already on site, although some hostas were new. Here’s the garden in 2008 in the fall.

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Fall asters (Astereae spp.), sedums (Sedum ‘Autumn Joy’ in this case), hostas (Hosta spp.), wild ginger (Asarum canadense), fall rudbeckias (Rudbeckia fulgida and triloba), purple coneflower (Echinacea purpurea), ninebark (Physocarpus opulifolius), iris (Iris spp.), astilbe (Astilbe spp.), sweet woodruff (Galium odoratum), Ozark sundrops (Oenothera macrocarpa), coral bells (Heuchera spp.), cranesbill (Geranium spp.). All doing just fine.

And 2009 below, in the spring. Irises (Iris spp.) lemon lilies (Hemerocallis lilioasphodelus), lungwort (Pulmonaria spp.), poppies (Papaver rhoeas), ditch lilies (Hemerocallis fulva), variegated solomon’s seal (Polygonatum odoratum ‘Variegatum’), bracken (Pteridium aquilinum), bleeding hearts (Dicentra spectabilis), daylilies (Hemerocallis spp.).

BP6_plants_2009

Certainly, planting in general under walnuts is challenging – they cast dense shade and have extensive, water hungry root systems. Watering after establishment and for the first season is critical. We also had our walnut tree pruned professionally (it needed it) so it actually gets decent sunlight in the latter part of the afternoon. Like any fruit or nut tree they are messy, from their spring pollen to their leaves and nuts…oh those nuts.. 2017 was a crazy year – buckets of walnuts (I even had to engage my neighbours’ lovely children from across the street to help collect them) to 2018, with almost no walnuts. My trees are old too – although well pruned, their leaves drop at that first hard frost. 1

 

In Defence of Walnut Trees

Black walnuts are not all bad, and I will continue to treasure them in my yard. They are an amazing shade tree, are highly valued for their fine grained dark wood (for furniture), a great food source for wildlife and birds, and my white breasted nuthatches’ favourite spot to hide their seeds.

We have definitely had our challenges with our walnut trees, and I’ve learned a great deal over the past 20 years. But one thing I know – I can garden with them around. You can too.

Note: Black walnuts are not the only tree that produce juglone – other members of the Juglandaceae also produce it as well as hickory trees. Butternut, English walnut, bitternut hickory, pignut hickory, pecan, shagbark hickory, mockernut hickory are in the same family.

Facebook Groups for the Green Community

By Mary-Jane Pilgrim, Master Gardener

Two weeks ago, I wrote about iPhone and Android apps that can help you to identify plants & trees, know where/when/how/what to plant and also help you to connect with like-minded people for discussion.  Facebook groups serve similar purposes.  At this time of year, these groups are eye-candy for the green community as they often remind us how few days are left until spring, where to attend local (indoor) green/gardening events, and how to care for those houseplants that need a fb groups bloglittle TLC.  During the gardening season, these groups magically transform to become a forum for a little bragging for those inclined to share pictures of the results of their hard work, and also a forum for those needing a little help.  I’ve posted a plant picture to one of them, and had a definitive answer to an identification question in literally less than ONE MINUTE (Thanks, Jeff Mason!).

Here’s a list of some of the (mostly local) groups that I’m a member of.  There certainly are a lot more!  Most are public, but don’t let the ‘closed group’ label scare you.  If anything, closed groups are completely welcoming to gardeners!  They just may ask you to answer a few simple gardening questions to make sure that the group doesn’t get infected by spammers.

Over the Fence with Peterborough Master Gardeners (530 members)

A local group specializing in plant identification, local events, and gardening questions answered by knowledgeable Master Gardeners. Novice, expert and professional gardeners are encouraged to join and post freely.

Ontario Gardeners (3, 571 members)

This group is for us Ontarian’s to post, chat or ask about plants we have in the yard, pond or house. Check out our files section newly created Oct.2016 and will be added to over time. Happy Gardening!!!

Canadian Gardeners (10,443 members)

This group is for anyone that wants to discuss flower gardens & vegetable gardens that live in Canada. Help others with tips, share your gardening secrets and stories and maybe learn a thing or two yourself! Lots of gardening links, self help and diy posts. Share your favorite gardening books, tools, websites and photographs with your fellow Canadian Gardeners! Add your zone to aid in advise, tips and to give your fellow Canadian Gardeners the idea of conditions you garden in 😊

GardenOntario (2,026 members)

To reach, connect and help educate all members through gardening related articles, videos, live broadcasts, activities and events happening with our societies across Ontario. Affiliated with the Ontario Horticultural Association.

Canadian Succulent & Cactus Hoarders (2,166 members, closed group)

A community place for Canadians who are addicted to collecting succulents and cacti. Ask questions and show off your collection! For now buy/sell/trade posts will be allowed until the group grows big enough that it warrants a separate group.

Plants for Peterborough Canada (657 members, closed group)

Peterborough Ontario Canada – A place to share plants for free. Upload pictures, share tips, get help thinning your gardens, get advice, play the *What on earth is growing in my garden game* offer plants, get plants, swap plants, its allllllllllll about plants! We encourage FREE share. Please save the selling of plants for kijiji. We also encourage you to share photos of your gardens, and upcycling ideas to beautify them!

Garden Deals for Peterborough, Canada (208 members, closed group)

If you know of a good deal on plants or gardening material in the Peterborough, Ontario, area – please post it here. Also – please share if you find unique plants that people may be interested in!!

Garden Seminars & Workshops: Every Gardener’s Should-Do List

By Lee Edwards, Master Gardener

As Gardeners, we already know that gardening has many benefits including improving our health and connecting us with nature, to name just a few.  That said, did you know that attending gardening seminars and workshops can also improve your health- brain gain, ramp up your gardening skills, get you out meeting others with similar interests, and increase your communication abilities?  Even more, seminars and workshops add new ideas to your horticultural know-how, empower your confidence in gardening, and help to propel you to new gardening heights.

So, what does a gardening seminar or workshop look like?  Well, unlike lectures, they tend to be short, interesting, educational talks or demonstrations usually featuring a speaker engaged with a small group of attendees focused on garden topics of interest to the attendees.  During the event attendees typically get the opportunity to ask questions, participate in hands-on activities if any, learn something new, connect with speakers and increase their existing knowledge.

Indeed, during the cold winter as outdoor gardening slows down, attending a garden seminar or workshop is a great way to break up the long winter months away from the garden while remaining involved in garden goings-on and being amongst gardening enthusiasts.  The lively energy and creative atmosphere that permeates these events are infectious to everyone, worth the time and fee to attend, not to mention downright fun most-times.  Truly, garden seminars and workshops should be on every gardener’s yearly to-do list.  If you’ve never been to a garden seminar or workshop, now may be the time to try one, to investment in yourself, inspire your creative growth and add to your gardening knowledge.

Did you know that the Peterborough & Area Master Gardeners annually present a wonderfully fun and informative gardening seminar called “A Day for Gardeners?”

2019 Save the Date

A Day For Gardeners Seminars by Peterborough & Area Master Gardeners

A day of fun, friendship, food and learning.  Select 3 of 6 seminars presented by Master Gardeners and speakers on topics of interest to both new and experienced gardeners.

Date:   Saturday, March 2nd, 2019
Place:  Activity Haven Centre – 180 Barnardo Ave, Peterborough, ON K9H 5V3
Time:  10:00am – 3:00pm
Price:   $35 – EARLY BIRD (register and pay by February 2nd, 2019)
$40 – after February 2nd.
Includes lunch.  Walk-ins on day of seminars are welcome if room is available.

Have Fun Gardening!