Category Archives: winter

Winter Weeds

By Laura Gardner, Master Gardener

At this time of year there are two kinds of easily identifiable weeds: “winter annuals” and “biennials.” Biennials begin their lifecycle by germinating from seed in the first growing season. Winter annuals germinate from seed in the fall. They both form a vegetative basal rosette that lies in a suspended state over winter. The rosette protects what is known as the shoot apical meristem—stem cells of the plant that are responsible for the generation of shoots and leaves later in the spring. They will then grow more upright, flower, produce seeds, and then die, finishing their lifecycle. Some species may function as either a winter annual or a summer annual. Summer annuals germinate from seed in the spring and complete their life cycle that same year. One of the challenges of managing summer annuals is that they can reproduce more than once a year, potentially contributing to a large seed bank. Biennials generally take two years to complete their lifecycles. However, some so called biennial species may extend into subsequent growing seasons and be more like perennials if they have sufficient root energy stores and have not had the opportunity to flower and go to seed. This can happen if you do not remove at least the root crown of the plant when weeding.

In the Peterborough Public Library’s native plant garden, I took some photographs of some basal rosettes with the idea of identifying them later at home. Coincidentally, a copy of a book that I had on order for more than a year finally arrived: Weeds of the Northeast, 2nd Edition, by Joseph C. Neal et al. (Cornell University Press). In addition to the US Northeastern, Mid-Atlantic, and Upper Midwestern states, the book includes Southern Canada. In the 26 years since the first edition was published in 1997, more than 200 new species have been added. Many of these new species are invasive plants from the horticultural trade [e.g. Common Periwinkle (Vinca minor)]. It is strictly an identification guide and so if you are looking for weed management guidance, this type of information will need to be found elsewhere.

The book has a dichotomous key that is a bit different from others. It relies on identifying the plants through their vegetative parts such as leaf lobes, leaf arrangement, leaf margins, leaf hairs, etc., but not on their floral traits. It also does not lead you to an immediate single species identification, but rather enables you to compare your plant with several possible matches through their photos and descriptions. The photos are particularly valuable for identification purposes—showing plants in various stages of life—from seedling to maturity. The glossary is helpful for those that are unfamiliar with some of the botanical terms. This is a great resource for anyone to use to confirm the findings of a plant identification app.

Here are some of the weeds I found and identified using this guidebook:

Shepherd’s Purse (Capsella bursa-pastoris): A summer or winter annual.

Shepherd’s Purse (Capsella bursa-pastoris)

Field Pennycress (Thlaspi arvense): A Summer or Winter Annual

Field Pennycress (Thlaspi arvense)

Canada Horseweed (Erigeron canadensis): Summer or Winter Annual

Canada Horseweed (Erigeron canadensis)

Bull Thistle (Cirsium vulgare) and Common Mullein (Verbascum thapsus): Biennials

Bull Thistle (Cirsium vulgare) and Common Mullein (Verbascum thapsus)

Gardening in January

By Christine Freeburn, Master Gardener

Here we are in the dark days of winter; the holidays are over, the new year has been rung in, and the days are getting longer as we see the snow falling and the temperatures plunging.

Although we can’t go out and play in the garden, there are still lots of things we can do to satisfy our green thumbs.

Clean and sharpen garden tools
Buying good quality tools and keeping them clean and sharpened just makes good sense. Diseases can be passed through your tools, so always wipe with soap & water or even better with disinfectant wipes. Check out this site for tips on keeping tools in great condition.

Check out seed catalogues online
Growing plants from seed gives you a wider variety to choose from and also the satisfaction of growing your own. If you are a vegetable grower, try something new this coming season. If you are like me, you will want to order a paper copy catalogue from your favourite seed companies.

Start a garden journal
Set something up on your computer with charts and photos, or start a written record in a blank book or special garden journal. Record new plant purchases and who you bought them from and where they were planted in your garden. Include successes, ways to improve and dreams for next season.

Review last year’s garden successes
If you have kept a journal, you can check your notes. How can you improve for this coming season? Did you plant the right plant in the best location? Were soil, light and water conditions the best they could be? Remember that weather can determine success or failure as well. Some plants thrive with wet cooler springs while others enjoy hot and humid weather.

Check your houseplants for signs of pests or diseases
Gnats and aphids seem to come alive during the next couple of months. Have Safers soap ready to combat those nasty pests. Remove diseased leaves and isolate plants that are sick. Many houseplants are in resting stages and are not actively growing, so do not fertilize. Houseplants may not be drinking as much either so water sparingly. Have a bright indirect spot in your home? Maybe it’s time for a new specimen. Remember to isolate your new plant to ensure it is not infested or diseased before introducing to the rest of your collection.

Brighten your home with some fresh cut flowers
There is nothing like fresh cut flowers to brighten up a gloomy winter day. Check out this post on our website for caring for cut flowers.

Read a gardening book
When the weather outside is frightful, be sure to have a list of books to read, whether physically or electronically. Lorraine Johnson’s A Garden for the Rusty-Patched Bumble Bee is on my list.

Outside garden maintenance
When you are outside shovelling snow, throw some clean snow on and around any of your more tender perennials. Things like rhododendrons and hibiscus overwinter better if they have a nice layer of snow to cover and insulate them. If the weather has gotten mild and the snow has melted, cut and use your old Christmas tree branches to cover and protect from the coming frigid temperatures and bright burning sunlight.

Sign up for some online learning
There are many local garden organizations that have newsletters, blogs, YouTube videos and live zoom events available. Be sure you are learning from a reputable and local site if you want to add to your knowledge for your own garden. You can, of course, enjoy the foliage of some exotic locations, but know we can’t grow most of it in our zone 5 environment.

Try these sites for local learning. Some sites offer free webinars while others will charge.

https://arboretum.uoguelph.ca/educationandevents/workshops
https://splibrary.ca/events/gardening-changing-climate
https://www.eventbrite.ca/e/attracting-pollinators-to-the-garden-tickets

Already signed up for some online learning?  You can share with us or post on our facebook page “Over the Fence with the Peterborough Master Gardeners

As of today, there are only TEN more weeks till spring.

Use this time to rest, plan and dream for the next season.

In Praise of the Lowly Common Juniper

By Mary-Jane Pilgrim, Master Gardener

I am always amazed that wildlife makes it through winter in our zone, as food doesn’t appear to be all that plentiful when everything is covered in snow and ice. However difficult it seems, native wildlife have a variety of adaptations to surviving winter; knowing where to find food is one of them.

Juniperus communis or common juniper is one of the most widely distributed trees in the world. They are members of the Cupressaceae family. They can tolerate a wide range of conditions; they are tough, they can survive with a lot of wind, and thereby can provide protection for animals in harsh weather. Junipers have a strong scent, bitter taste, and sharp needles. Deer tend to ignore plants with these attributes.

The berries, however, are a different story. They begin life a grey-green color, and ripen in 18 months to a deep purple-black hue with a blue waxy coating. While they are called juniper berries, the “berry” is actually a cone, the female seed cone. Junipers are almost always dioecious which means that in order for the female plants to set fruit, a male plant must be in the vicinity.

Juniper berries are one of the top late winter foods for many birds and mammals which covet the deep blue orbs. They aren’t particularly high energy or calorie-dense; they are soft and fleshy, and have a strong, woody, spicy, pepper-like flavor with a gritty texture. Perhaps this is why they are ignored early on, but in the depths of winter when all the other really desirable food is gone, they become more popular with wildlife. Juniper berries could be the difference between survival and starvation for the species who rely upon them.

Junipers have a long history with humans as well as wildlife. These trees are responsible for one of the only spices derived from a conifer. The ripe, blue berries were and are currently used throughout the world to flavor meats (particularly wild game) – and sauerkraut. The first record of juniper berries was in Ancient Egypt at around 1500 BC.

During the Black Death in the 14th century, plague doctors wore masks with long beaks full of juniper berries and other botanicals to mask the unpleasant smells they’d encounter tending the sick. They believed that juniper stopped the spread of the disease. This was somewhat true – the disease was spread by fleas and juniper is an effective and natural flea repellent.

Most famously, the unripe, green berries are used to flavor gin. Gin is originally from the Netherlands — in the 16th century, a schnaps was distilled with juniper berries to become so called “Genever” (in dutch: juniper berry) which was consumed for medical purposes. “Genever” developed to become the today’s “Gin”.

Juniper berries have since been used to flush out toxins, heal infections and even aid in digestion. Caution: If you intend to forage your local woodlot for berries, be wary because while most of them are harmless, there are some species that have mildly toxic berries. Do not randomly harvest juniper berries unless you are sure of the species.

Foraging aside, if you are looking for native plants for your garden, a few juniper bushes are a great choice. They’re hardy, provide cover and food for a variety of wildlife, and will definitely help our wild neighbors survive particularly difficult winters.

Foraging for Winter Décor

By Marilyn Homewood, Master Gardener

As we enter the holiday season, the time has come to start collecting some of nature’s bounty to create seasonal trimmings for your home.  Much of this bounty is right under our noses and can be gathered easily. Foraging should begin at home on your own property.  It is surprising at what you can find in your own garden not just in terms of evergreens but also dried material such as seed pods.  For those items not immediately on your doorstep, look elsewhere where you have the permission (I visit friends for a few snips of things from their gardens) or forage on public spaces such as roadsides.  Remember to harvest sustainably taking only what you will use and take minimum amounts from each plant.  When harvesting boughs, only use trees larger than 6 feet and cut your boughs 2-4 feet from the tip of a branch and above a node to encourage regeneration. Make it look like you were never there.

Swag on potting shed

Cedar, white pine, white spruce and scotch pine can be found in abundance locally but don’t overlook the junipers (I like to use wild junipers), yews and euonymus.  Fir is really nice but more difficult to source in my area but it is available for purchase.

Boughs can be used as garlands or in planters.  The soil in the planter acts as a source of moisture until freeze up and also stabilizes the display.  Conifer branches can also be cut down to be used in table arrangements or in wreaths.  For arrangements kept indoors, fill the container with a mixture of potting mix and vermiculite and keep damp to prevent needle drop. 

Winter wreath

Woodies: Two species that are used extensively in this area are white birch and red osier dogwood.  Both provide colour contrast and add a structural element.  I keep my birch from year to year so only had to source once. Birch is available for purchase at many stores.  Dogwood is available anywhere it is moist so remember to be mindful of your footwear when foraging.

This arrangement lasted 6 weeks before the needles began to drop

What says the holidays better than pinecones?  They come in many different sizes and shapes depending on their species.  Closed cones can be opened by placing on a cookie sheet and baking at 250 degrees for 1 hour.  Cones can be used as accents in planters/arrangements/wreaths or by filling bowls full of them.  I have dipped the edges of my pinecones in white craft paint so they appear to be snowtipped.

Other additions to my gatherings include seedpods from Siberian iris and oriental poppy, seedheads from coneflowers and penstemon and dried allium heads.  Some types of perennial foliage such as that from Heuchera “Palace Purple” and the Penstemon “Dark Towers” is long lasting and adds interesting contrast to an arrangement. I also used some of my dried hydrangea in the planters.

Coneflower in planter helps to provide winter interest

Berries add a nice pop of colour and it is hard to beat those from the winterberry bush (Ontario’s native holly, Ilex verticulata) but these are not commonly found wild in this area due to our higher soil pH. Some of the local nurseries and florists have it available for sale however.  I do purchase some for my planters, for my wreath, I use the berries from the choke cherry bush (Prunus virginiana).  The bright red berries retain their colour throughout the entire winter and are not eaten by the birds (unlike the berries from the grey dogwood that were eaten after the first cold night).

When you’re done, if you still crave more variety, local nurseries have greens and other decorations available for sale.  For ideas on how to use what you collected, go no further than YouTube and Instagram.  One of my personal favorites are the Instagram live sessions done by Claus Dalby (Denmark’s version of Monty Don). They are posted to his IG page (clausdalby) as “Master Classes in Nordic Christmas”. It is a great source of inspiration and puts one in the holiday mood.

Not into foraging? Visit your local nursery. The offerings are astonishing!

Winter planter after a snowstorm

Winter Gardening Activities

By Cheryl Harrison, Master Gardener

Winter in Ontario, Canada, is a time for gardeners to relax, plan, learn and become inspired…..so let’s explore!If you are new to gardening and want to learn more and/or would like to connect with other gardeners then joining one or more local horticultural groups might be of interest. The Ontario Horticultural Association divides Ontario into districts.  District 4  lists horticultural groups for Bobcaygeon, Brighton, Campbellford, Coboconk, Cobourg, Cramahe, Ennismore, Fenelon Falls, Grafton, Lakefield, Lindsay, Minden, Omemee, Norland, Norwood, Peterborough and Port Hope..   For more information check Ontario Horticultural Association / GardenOntario.

For those who have been gardening for awhile, you may wish to become a Master Gardener.  Master Gardeners inform, educate and inspire others to create healthy and vibrant gardens, landscapes and communities.  We promote horticultural practices that are safe, effective, proven and sustainable.  For more information check Master Gardeners of Ontario and Peterborough and Area Master Gardeners.

There are many Horticulture related educational opportunities….some offered on-line and some in-person.  Both the University of Guelph and Dalhousie University offer on-line courses that will fulfill the requirements for a Master Gardener certificate.  The Horticulture and the Master Gardener groups all have an educational component to their meetings and some may be accessible on-line.  The Peterborough and Area Master Gardeners are again offering, on March 4, 2023, the inspirational and in-person “A Day for Gardeners”  after a 2 year hiatus.  Watch the web site, Peterborough and Area Master Gardeners, for registration and more information.

Plan for next summer with catalogues, books and on-line research.  We are fortunate to have many seed companies in Canada.  A list of “Home for the Harvest’s” top 25 may be found here.  Please save room in your garden plans for plant shopping at your local nurseries too.  Local nursery staff are able to provide you with invaluable information on growing in your region.  Your local library is guaranteed to have some gardening books that you could borrow.  On-line research will also provide a wealth of information…..try a search for “Gardening in Ontario”  and you will see what I mean.  A really great source of information is a fellow gardener.  Ask any gardener a gardening question and they will be thrilled to give you some guidance.

And last but not least, please make time in your day for fitness.  You need to keep yourself fit for all of the gardening activity that you have planned for next summer.  Gardening is an excellent way to maintain a good level of fitness, both mentally and physically.  Read more about the benefits of gardening as exercise here .  There are YouTube videos that can get you started.  I particularly liked the video located here.  The presenter demonstrates some exercises and some things that you can do to prevent injury while gardening. You might consider just getting together with a couple of friends to practice yoga, do some strengthening and flexibility exercises or go for a walk.

The world of gardening is immense.  Keep track of your ideas and resources so that when gardening season returns, you will have the information readily available.  I hope that this medley of gardening choices will help you to relax, plan, learn and become inspired during the upcoming Ontario winter!

Winter: When Bunnies Can Wreak Mortal Havoc on Gardens

By Mary-Jane Pilgrim, Master Gardener

Two weeks ago, MG Lois Scott wrote an article about Burning Bush (Euonymous alatus) and other invasives now on the Invasive Species lists that she is eradicating from her gardens in favour of natives. I actually used to have a beautiful Burning Bush, right at the front of my garden. And then winter came, and a furry rodent.

Rabbits might look cute and fluffy, but they’re not a welcome sight for gardeners; especially between December and March. As cute as they might be, they can cause serious damage to plants in the winter when greens aren’t available for them to easily munch on.

Pretty sure that Bugs Bunny, who we could see in the snow through the living room window, caused the demise of the burning bush. In the spring, it didn’t bud. Most of the outer bark was missing and tooth marks were very evident. It was as dead as a doornail. (Aside: “Dead as a doornail” is one of the oldest idioms found in print, going back to the 14th century. It referred to nails having been pounded through a door, and having the pointed end pounded flat against the door. That nail could not be reused!)

Back to my story. Apparently, our neighbourhood cottontail had made a lunch or dinner (or several of each) out of the soft bark on our small burning bush shrub and also my prized “Perry’s Gold” pine (Picea abies ‘Perry’s Gold’), purchased from Anna’s Perennials; my favourite local garden centre. Sigh. Happily, Anna had another one for me.

Obviously, rabbits don’t hibernate. When winter arrives and greens disappear, they turn to nibbling on the bark of young trees such as birch, crabapple, mountain ash, honey locust, willow and oak. Older trees with their thick rough bark aren’t as tempting as a young tree where the bark is smooth and thin. Green food material is just under the surface of young trees.

The rabbit’s menu also includes bushes/shrubs, such as roses, sumac, Japanese Barberry, viburnum, Burning Bush, Rose of Sharon, arborvitae/cedars and other broadleaf evergreens. It’s all about survival and they won’t be picky when their populations are high. Once a rabbit has chewed the outer bark of a small tree or shrub, little can be done to save it.

While I feel for the starving rabbits out there, there are a few preemptive steps you can take to stop rabbits from wreaking mortality havoc in your gardens. The most effective is to place chicken wire fencing around vulnerable plants like a cylinder. The fencing material needs to be high enough that rabbits won’t be able to climb or reach over the fence after a heavy snow. In most cases, a fence that stands 2-3 ft should be sufficient. To prevent them from crawling underneath the fencing, pin the fencing to the soil with U-shaped anchor pins.

Small trees can also be protected by placing white spiral tree guards around their trunks or by wrapping them/their trunks in burlap. Damage may be further reduced by removing brush, junk piles and other places where rabbits live and hide from around your home.

Lastly, there are a few plants that rabbits seem to find less appealing, particularly plants with thick or prickly leaves, and plants with very strong scents. It may be worth it to experiment around your prized shrubs with hellebores, foxgloves, allium, acanthus (bear’s breeches), and salvia (sage).

A final parting note: One or two rabbits that overwinter in your garden this year could mean dozens returning to munch on your prized shrubs next winter, given the fertility of these furry rodents!