It seems too out-of-season to think about winter at the end of August, but despite our revels in tomatoes, squashes, melons and other summer delights, anyone who wants a winter garden and hasn't already sown seeds or set out transplants needs to do that now or within the next few weeks.
Cool-season crops depend on these warm weeks of late summer for establishing strong root systems to carry them through months of cold and rain while they slowly push toward fruition.
If you're unsure about what to plant, you can print out two calendar guides and lists of crops by visiting sonomamastergardeners.org (click on Kitchen Garden on the menu bar).
For several crops, it's possible to make two plantings, one now and another in late September.
Leafy greens and peas, cole crops — cabbage, cauliflower, kohlrabi, broccoli, kale, collards — and root vegetables — beets, turnips, rutabagas, parsnips, radishes, onions, leeks, shallots, garlic, carrots — all thrive when planted now or in early spring. In our relatively mild winters, most can remain in the ground for many weeks if not for months.
Lettuces and greens will be ready this fall and can be planted again in a few weeks, but be patient with cauliflower, one of the best crops for the winter garden. Even though you sow seeds before the end of August or set out transplants through September, the harvest could be delayed if we have an especially cold winter.
<b>Create planting space</b>
Because broccoli, cabbage, and cauliflower need a fair amount of space, about 18 to 24 inches between plants, you may need to clear out some beds or wait to set out transplants until later in September after more summer crops have finished.
Root crops may appeal to gardeners for sowing first. They don't require a great deal of space planted fairly close in rows or broadcast in beds. Beets must always be thinned, though, since seeds are really seed clusters. As you snip, rather than pull, young tops, add them to green salads.
Be sure to note the "time-to-harvest" information on seed packets or transplant tags. Short-season varieties of broccoli, for example, will mature in fall whereas long-season varieties form larger heads in response to winter chill and lengthening days after the New Year, and may not be ready for eating until nearly spring.