Extending the Harvest

Photo by Gayla Trail  All Rights Reserved

This piece was originally published in The Globe & Mail over the weekend as a part of my series on kitchen gardening.

Regarding using burlap and burlap sacks: Just to be clear, do keep them away from the crowns of your plants since they can get awfully heavy when wet. In fact, they are best used over the winter to prevent the erosion of large, open patches of soil from which annuals have been removed. Even better still, place the dead plant matter (browns) and some kitchen scraps (greens) underneath the burlap and you’ll have fresh compost on the spot come spring.


I love a fresh, crisp fall day. Many of us would agree that it would be the best season of the year if not for the fact that it is a stepping-stone to the inevitable: winter.

Who knows what this fall will bring given the wacky weather hijinx we’ve experienced this year. But let’s pretend for a moment that everything will go as planned and there won’t be snow sprinkled on the peppers tomorrow morning (please gods). We can’t control the weather or stave off the inevitable, but as gardeners there are a few methods we can employ to hold back the effects of seasonal change and keep the party going just a wee while longer.

You’re already one step ahead if your garden is a raised bed. They warm up slightly early in the spring and tend to stay warmer as the fall cools down. A thick layer of mulch such as straw, buckwheat hulls, or shredded newspaper keeps the soil and surface roots warm through nippy nights and breezy fall days. An actual blanket made of burlap gets the job done too, but can get awfully heavy when wet so be sure to cut big holes to keep it off the crowns of plants. An even better blanket still is black plastic. The dark colour attracts the sun’s rays and the plastic holds moisture through fluke fall droughts.

In lieu of cumbersome blankets, which can be difficult to maneuver in small spaces, or used alongside them, are an assortment of store-bought and homespun contraptions that can be fitted over individual plants or entire beds to trap warm air and create the effect of a miniature greenhouse. Hoop houses are toasty-warm tunnels made of metal or plastic hoops draped with a clear plastic tarp that let’s light in and keeps warm air from escaping. You can buy them ready made from garden suppliers such as Lee Valley or make your own inexpensively using bendable metal shaped into arcs or dollar-store hula-hoops cut in half. Push the arcs into the soil intermittently to support the length of the tunnel and cover with a big sheet of plastic. Secure the plastic in place by stapling to the sides of raised beds or with clips purchased at the hardware store.

Greenhouses made to cover individual plants are called cloches. Fancy glass cloches are nice to look at but expensive at about $30-40 a pop! Never mind, you can make as many as you like in a variety of sizes for free from plastic water bottles rescued from the recycling bin. Simply cut off the bottom and set the cloche over tender greens or frost-sensitive plants you’d like to keep in the garden just a little bit longer. Keeping the cap in place locks warmth inside, or you can remove it to water your plants and let heat escape on particularly sunny days.

Cold frames are the way to go if you’d like to get a shot at keeping particularly cold hardy greens such as mâche, kale, spinach, and arugula producing food straight through into the winter (and beyond). It’s really nothing more than a low-tech box with a hinged glass or plastic lid. The trick is to dig the box at least a few inches into well-draining soil and give it a south-facing position. Open the lid when it gets too hot, and insulate both the sides and top with newspapers, straw, and old burlap sacks when night temperatures drop below freezing. They’re not exactly practical when growing up on a roof or in pots but compact versions set on top of a planter box will ensure at least a few extra homegrown salads this fall.

Gayla Trail
Gayla is a writer, photographer, and former graphic designer with a background in the Fine Arts, cultural criticism, and ecology. She is the author, photographer, and designer of best-selling books on gardening, cooking, and preserving.

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10 thoughts on “Extending the Harvest

  1. I like the idea of the plastic bottle cloches. I don’t have a frost problem, but there’s a field rat that’s been destroying anything I plant. :-(
    He seems to be interested only in the tender roots of the plants – I’m wondering if these cloches would help protect the seedlings till they are stronger from rats?

  2. Yogita: It might work. This often helps with digging squirrels. I’d suggest using a tall bottle that you can sink into the ground deeply. That should offer more stability and better protect the roots.

  3. This is exactly what I’ve been looking for. I’m new to gardening, like I just started last week, and the fact it was getting cold was the big concern for me. This helps so much! Thank you!!!!

  4. Planted Brocoli late in Summer on Balcony. Just starting to form small heads maybe a couple of weeks till i get some. I dont think these mind the cold.

  5. just an update – the rats have been kept away by this method. I’ve also mulched the patch with straw and somehow that seems to have helped too… either the rat does not notice what’s in the hay and gets confused, or he doesn’t like it… not sure.
    but the outs\come of all this is – seedlings are alive!

  6. Several years ago I had a nice garden &
    used the hooped wire and plastic it worked
    very well. But wish I had known about the

    I also used 1 gallon plastic milk jugs
    as an inexpensive cloches. They worked
    very well also.

    Planting my tomatoes kind of late one
    year I had lots of Cherry tomatoes but
    they were still flowering in Sept. which
    gets very cold here for plants at night.
    Sometimes -3 although the days were very warm.

    So what I did was wrap my tomatoes with
    huge sheets of clear plastic and secured the
    wrap around with clothes pins.
    This extended my harvest for a little while longer.

    Now I only have a few potted plants on my
    porch, but I still cover them loosly with
    plastic if the night is going to be
    cooler than 10C.

    There is a small window type box on the property
    sitting on 2 cinder blocks about 8″ off the ground.
    It is approximately 8′L x 1′W x 1′H and
    I’ve been thinking of trying the hoop-house
    idea with hula-hoops (thanks great idea)
    if I can find some, and planting a few seeds
    to see if they can survive.

    Will try to update you later this fall/winter.

    Great article. Thanks

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