Cold Climate Gardening

Many gardening books for children take what I think of as the art project approach: here’s what you need, this is what you do, isn’t that cute?, now show it to Grandma. Very few books out there take children–or a child’s interest in gardening–seriously.

I prefer to regard children as apprentice gardeners, gradually acquiring more skills as the years go by, working their way up (at their own pace and interest level) to journeyman and eventually master gardener. As much as possible, I like to let them choose their own projects, plan the execution of them, and solve their own problems. Here are three books, supposedly for adults, that do just that. [Read more →]

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Not too long ago, a reader emailed me and asked,

I bought some hostas and dwarf bleeding hearts to plant. Shortly thereafter I hurt my knee and I can’t go out there and plant them. They are all planted in one gallon plastic pots. How can I safely winter them? If I put them in my garage they will still freeze.

It is the roots you are worried about freezing. The rule of thumb is that roots in a pot will effectively be in a situation two zones colder than plants in the ground. So if the plant tag says zone 5 and you are in zone 7 they should be fine.

But I’m guessing you live in a colder place. Definitely keep them outside until the tops die down. You want them to go dormant. After that, you want to put them in a situation where they will stay dormant but not get colder than two zones warmer than the hardiness zone on the tag. That will be different depending on what is available at your place. The garage might be okay, if it gets cold, but not as cold as outside. You could put them up against the house, and surround them with bags of leaves for insulation.

The other thing to consider is the greater the volume of soil in the container, the more insulation the roots will have. A one gallon container is not that big, and won’t have much insulating soil mix for the roots, so you might err on the side of caution and make that three zones warmer than the tag.

I have a drafty, dirt floor cellar that barely stays above freezing. I have put dormant plants in the coldest corner of the cellar and pulled them through the winter. They did start growing sooner than they should have, and made some pale spindly growth, but I very carefully hardened them off and planted them after all danger of frost. It was a pain in the neck but better than losing them.

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I normally don’t weed my beds in November, because it is too chilly, wet, windy, and perhaps snowy. However, we have been enjoying a string of unseasonably warm days and I was able to take advantage of it today. Weeding grass out of daylily foliage is usually pretty tricky, because the leaves are so similar. But my daylilies have gone dormant, while the various weedy grasses will continue to grow until the ground freezes solid. If we get a good blanket of snow before that happens, those grasses may grow slowly all winter long. So it’s nice to get the upper hand for once. For a little while. [Read more →]

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Recently, Chris of Backyard Gardening Blog published a timeline in pictures, demonstrating the growth of his ‘Endless Summer’ hydrangeas. I found it very interesting to compare his photos with the few I took. You might want to have his post open in a separate tab of your browser so you can quickly flip back and forth to compare shrubs.

I didn’t take an early May photo this year, so we will have to assume that the hydrangea emerged from dormancy about the same time this year as it did in the photo above. As you can see, it is not even as far along as Chris’s May 1st photo, and Chris considered his hydrangeas behind in their growth at this point. Those are daylilies in the foreground. [Read more →]

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When the days grow shorter, when we’ve had several freezes (and even a dusting of snow), and when we finally concede it’s time to drain the hose and close down the storm windows on the last remaining screens–that’s when we begin to harvest the leeks. [Read more →]

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The mums and the last of the double colchicums are still throwing out new blooms, but after a hard freeze they look like wet facial tissue. All but the stubbornest trees have dropped their leaves, and most perennials, if they have any leaves at all, are looking either yellow, brown, or mushy. But there are still some plants that are looking great. Yes, great!

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Most herbs taste much better fresh, and rosemary is no exception. That’s why every winter I try to keep my rosemary alive in a pot inside the house. Rosemary is not reliably hardy north of zone 7, so while southerners can grow this in the ground and watch it take on shrub-like proportions, we cold climate gardeners must bring it into our houses and attempt to give it the equivalent of a southern winter indoors, or it will never really get big enough to harvest from regularly.

It’s not easy, let me tell you. More than one northern gardener has finished the winter with a dead rosemary plant. [Read more →]

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