Depending on where you live, you may have a few empty spaces in your vegetable garden right about now. If you've already harvested your tender spring crops, you might be wondering what to plant in the holes they've left behind. Spring staples like lettuces, spinach, peas, and radishes are usually past their prime or stop producing by mid-July, so why not add a few, short season crops to your summer vegetable garden? You can fill in those empty spaces and prolong your harvest, and keep eating fresh, healthy, homegrown vegetables for months to come.
You'll need a few pieces of information first.
* How long will your new crop take to mature? Because plants grow more slowly in the cooler, shorter days of late summer and fall, add a 7-10 day ″fall factor″ to the number of days to maturity listed on the seed packet or tag to take this seasonal difference into account.
* When is your first frost date? To find out your average first frost date, check with your local Cooperative Extension office, or look online. Remember, average first and last frost dates aren't promises, they're averages! An early frost could nip a tender harvest in the bud, so keep an eye on the weather.
* Can your new crop stand up to some cold weather? Some vegetables like cabbage, spinach, and radishes will happily keep on growing when weather gets into the high twenties F; even lower for super-hardy kale and collards. An early frost won't make a dent in these harvests.
Leeks, early carrots, beets, bush beans, early cabbage, broccoli, and collards take about 60 days to mature, so if your first frost date falls in mid-October, you still have plenty of time to plant and harvest these vegetables. There are lots of cultivars to choose from, but here are a few of my favorites.'Little Fingers' carrots are ready to harvest at 60 days and can be harvested early as babies. 'Bull's Blood' beets are ready to harvest in 60 days and their gorgeous, purple tops (can you call them greens?) are both edible and ornamental.
Leafy crops like swiss chard, kale, arugula, and mustard greens can be planted in succession every few weeks, then harvested when their foliage is young and tender. No need to wait for them to mature, although you certainly may if you have a longer growing season.
Bok choy (aka pak choi) is an excellent short season crop and one of my favorite vegetables, period. It's delicious in stir fries or grilled whole or oven roasted. Some varieties
Plant a second round of radishes, many of which mature in less than four weeks. 'Early Scarlet Globe', and 'Cherry Belle', will be ready to harvest in less than 30 days and Hailstone White Globe Radish has a 25 day harvest time.
Cool season herbs like dill, chives, and cilantro, grow better when planted later in the gardening season. They prefer the cooler temperatures of autumn to the summer heat and when grown for fall harvest, will not bolt, or go to seed, as quickly as earlier plantings. Depending on where you live, it might not be too late to plant a warm weather herb like basil. It's often ready to harvest in less than a month, and you can never have too much pesto.
Many gardeners maintain that crops planted later in the season grow better because there's less competition from weeds, bug and the soil temperatures are higher, which results in faster growth. I think another reason for late season success is because we gardeners have relaxed after the initial frenzy of getting it all done in spring. We have more time to devote to individual crops and their specific needs.