When the dogstar is aglow
plant petunias in the snow.
When the snow begins to melt
Wrap your hollyhocks in felt.
When the felt begins to bloom
pick the apples off your broom.
When the broom begins to wear
weed the turnips in your chair.
When the chair begins to rock
prune the snowdrops in your sock.
When the sock is full of holes
blame the whole things on moles.
When the moles inquire: "Why
pick on us?" say simply "I
will instruct you how to grow
pink petunias in the snow. - NM Bodecker
Note: Today is the first day of my month-long fall gardening class, which will help more people keep that delicious fresh food coming as long as possible. There are still spots in the class if you'd like to join us - email me at firstname.lastname@example.org.- it isn't too late, we're just getting started! I will not actually be able to teach you how to grow pink petunias in the snow, sadly, but you can blame that on the moles, and be happy with the food and flowers that keep coming well into and through the winter.
Every year it happens to some folks - for whatever reason, the garden either doesn't get in early enough or doesn't do well. We get to the beginning of July and we're left with a sense of frustration that it is too late to do anything about it. Or maybe you are having a good year, and what you mostly want is to keep that going as long as possible - sure, you are preserving and ready to root cellar, but your favorite foods are the ones that come fresh from the garden and you want to know how long you can keep that going.
Good - because the answer is almost certainly "longer than you think." I live in central upstate New York, technically zone 5, but really in practical terms closer to zone 4 in temperatures (we're at 1400 feet). Our low temperature was -28 degrees one year, and our last frost has been as late as June 1 and our first has been as early as August 30 (unusual, our official dates are May 20 and October 7, and in the 8 years I've been here, last frost has come as early as April 23rd and as late as June 1, and first frost as early as August 30 and as late as October 31, so there's a pretty big range) and yet I've managed in various years to overwinter leeks, spinach, scallions, kale, collards, arugula and of course, the unkillable parsnips absolutely without any protection at all - and produce a great deal more with very simple and inexpensive strategies.
With protection, the range of possible crops expands a considerable amount, with the right choice of varieties. With very inexpensive and moderate investments in cover we can have a growing season that is nearly year round here - and with slightly larger investments we could have a year round one, we just haven't done it yet. Given that our family enjoys a lot of fresh produce, we find the very small investment we've made in season extension techniques pays us back ten-fold - that we actually profit more from the fall and winter garden than the summer one.
Just strategic planning the garden gives us a six month growing season rather than the four month one for people who put in their gardens on Memorial Day - that makes the payback of time and effort much more dramatic - and fall gardening is low effort, cool and pleasant, since most of the bugs are gone.
I think this is true for many people - as the season peters out, prices go up, and the cost of eating fresh food gets higher. In many cases, the quality goes down - the longer the food sits before you get to it, the less nutritious it usually is. Broccoli that arrives in your grocery store in winter may be a full week old before it even gets to your fridge - no wonder most of us end the winter feeling vaguely depleted.
Moreover, season extension and cool season gardening aren't just good for providing fresh food and increasing food security, but they can also reduce erosion, improve your soil and help you plan next year's crops - it is good for the whole garden and for everyone who eats from it. So what stops most people from doing it? For the most part, lack of familiarity with the realities.
The two major constraining factors in cool and cold places are these - light and temperature. I think most of us think that temperature is what matters most, and for most warm season annuals, including many of our favorite annual garden crops, it is. We've all come out to the garden to see almost everything blackened with frost, and known that it was basically all over. A garden composed heavily of the most popular crops, particularly a garden planted one time in the spring, won't have a lot to offer in the fall.
Hot climates also face season extension issues, although the critical factors for them are more about water and temperature than light. In very warm places, there is often a period of time nearly as long as a northern winter when not much is coming in since it is simply too hot - and with the negative factor that because there' s no natural cool, most of the previous season's produce won't keep without energy intensive strategies. So season extension is integral for both hot and cool climates, but for the purposes of this post, we'll talk about cool ones, and save that for another piece and more in-depth exploration. Even in hot climates, variety selection and strategies for protection can be really important - and often the things that will do best won't be the most common annual garden crops.
That doesn't mean that in cold places traditional annual summer vegetable crops can't be part of your fall garden plan - fast growing tender annuals can and should be part of your fall garden - for example, I plant my main crop of pickling cucumbers and bush beans in late June or early July - the plants will mature before frost, just as the first crop is petering out, but more importantly, it means I don't have spend as much time over a canning kettle in July and August - pushing harvests forwards means that I can can in late September when the heat is welcome.
What you need to know about these crops is that it will generally take a little longer for them to mature if planted after the equinox than before - declining light means that even though the days are long, many of the plants will mature a bit more slowly - so add some time to your growing season. Usually by mid-September in my zone (later if you are in southern zone, cooler in a northern one), most plants begin to grow very slowly, if at all - they will still mature fruit, but they aren't setting more blossoms or growing bigger, so if you want, say, to plant 55 day bush beans, you'll want to get them in 55 days before mid-September. Some of this involves guess work, and experimentation - it never hurts to take a chance.
Warm season crops that can be planted in my zone as late as early to mid July include zucchini and summer squash, shell beans, bush beans, cucumbers and basil. If you live in zone 6 or above, you still might be able to do short season winter squash or melons, even. Remember, even after a frost, you will still be able to keep things for a few more weeks - so, for example, if you plant cucumbers now, and mature a crop in September, you will be eating fresh cucumbers probably until a week or two after your frost - I find that it makes a big difference to extend one's season by even a couple of weeks into the fall.
The category of crops that will do best for most of us as the weather gets colder, though are mostly greens and roots. Almost all root crops are much more hardy than crops where we eat the aerial parts, which makes sense, because they are covered with a nice layer of insulating dirt. Many of them are also hardy in their own right - that is, they can take a lot of cold. Carrots, parsnips, leeks, turnips, salsify, scorzonera, celeriac, beets, parsley root, kohlrabi - all of these have varying degrees of cold hardiness. Many of them are cold hardy biennials - you eat the root the first year, usually, but if you leave them in the ground, depending on how cold it gets, they will come back and set seed next year.
The other category of vegetable that does well in cold weather is many greens - brassicas, lettuces, green herbs and many asian greens. Many of these, particularly the brassicas, have a wonderful feature where the starches in them convert to sugar after a hard frost or two. If you've ever eaten cabbage or kale or brussels sprouts after a frost, you'll know the difference is night and day - they are nice enough vegetables during the warm season, but in they are spectacular. This is true of most roots as well - your beets and carrots will be sweeter after the ground freezes a bit, your turnips will be tastier. Even your lettuces have a crisp sweet taste. These crops really come into their own after the other stuff is done with.
These plants can be challenging to get started in hot dry weather during summers - I'm going to do a whole piece on this, and we'll talk more about it in the class, but there are strategies that you can use to help you get ahead on this, so that you don't fry a whole garden full of spinach and bok choy in summer's heat.
A fall and winter garden will be heavy on greens and roots. Not all of these are equally cold hardy - beets and carrots, without heavy protection, for example, will simply rot in my climate. Yes, they can take some frost, but not a winter's worth. Parsnips will barely notice winter. Broccoli kicks out well before cabbage, and brussels sprouts will stand longer still. Getting to know your veggies will help you get the most out of them.
But back to light and temperature - daylight hours may matter more than cold here - at least if you are speaking of cold hardy vegetables. The plants start to shut down growth for the winter as the day length gets shorter. That means you'll want to put your winter crops in your sunniest spot - if you get part shade, save that for summer lettuces or greens, or for kale and collards you will keep going all summer. Don't plant you fall garden there, because it may not mature. And maturity matters - very small plants are a lot less cold hardy than larger, developed ones. You need to figure out when things stop growing at your light level - this may require you talking to your local cooperative extension, and it will probably involve some experimentation on your part.
What Eliot Coleman found when he began his project (he has the two definitive books on this subject _The Four Season Harvest_ and a new one _The Winter Harvest Handbook_) is that if you choose the right crops and master the timing, light ends up being more important than temperature. And I think that's particularly true if you are growing under cover as he is - he loses some light to filtration, and his temperatures, especially in the fall, are more moderate than mine are. If you are simply trying to extend your season as long as possible in an open garden, you'll find that temperature is trickier, because a really deep, hard extended cold spell will knock out a lot of crops. This is, of course, an argument for creating protected growing spaces, but since many of us may not be able to make large capital investments in hoophouses and other projects, it is also an argument for, well, being realistic about what you will accomplish.
To give a sense of the variation involved, let's consider two consecutive years of my fall gardens - 2007 and 2008. 2007 was an unusually warm fall - the first hard frost actually came on Halloween, the latest we've ever seen it. The winter was also unusually mild, at least in the first portion of it. I was able to pick turnips and leeks out of unfrozen ground with only a moderate straw mulch in early January. Spinach and kale overwintered uncovered for me, and we ate the last of the ripening picked-green tomatoes at Chanukah.
Last year, frost came early, a light one in late September, then a heavier frost in early October. At the end of October, we had heavy snow and four days in a row in the 20s. That pretty much ended the run of the broccoli, and other crops I've often been able to enjoy well past Thanksgiving. One of the realities of growing this way is you really don't know how long a season you will have - on the other hand, the only way to get the best for the longest is to experiment.
We will talk more about growing with cover as we go along, but what you mostly need to know is this - that fall and winter gardening are about experimentation. You can get advice from me or others who are doing it, you can read Eliot Coleman and get advice from agricultural extension, but most of what you will need to know you will have to learn in some way involves experimentation - if you grew up somewhere where everyone put in a garden once a year, and that was it, you will find that this is far less certain than waiting for the weekend after you last frost date, planting, and then harvesting it all in September. But that's not bad - it also means you can eat green stuff for part or all of the year, fresh from your garden - often better, tastier green stuff than some of what's available to you in the summer. This is worth some effort.
In some regions, weather also may be a potentially limiting factor. Here in the Pacific Northwest, some things that can withstand the temperature just fine can be killed off by months of rain. On the other hand, if you can protect them from rain, you may be able to keep them going for quite some time. The slugs, unfortunately, do not disappear with the onset of cool weather ...
If you do live here, Steve Solomon's "Growing Vegetables West of the Cascades" is a great resource for both summer and winter gardening.
I was kind of interested in this, but I live on the CA coast and I'm not sure if it'd really be appropriate since we don't really have winter here. I intend to try growing some annuals indoors this winter, and some oats and beets outside. I'm not sure if it will work, but I can afford to experiment.
I don't have much sun and have managed to grow beans and squash without much trouble, although I don't think they produce as well as they might in full sun. Also, I'm hoping they can survive the whiteflies until I can get some beneficial insects in. My balcony actually gets more sun in the winter due to the sun being lower in the sky.
Your article about 25 plants to grow has also gotten me interested in growing mushrooms out in the shade. The nearby nature preserve always has a ton of different sorts of mushrooms in February.
SciBlogs - now with Pepsi as bloggers: http://scienceblogs.com/foodfrontiers/
I'm a big fan of fava beans in winter. Garlic is also a good source of winter greens, if you don't mind diminishing the eventual harvest of bulbs.