" Plant 'em in the spring. Eat 'em the summer. All winter without 'em's a culinary bummer ," as John Denver sings in "Home Grown Tomatoes." So, just when should you plant* your homegrown tomatoes? Or, more generally, when should you plant your spring food garden? (For an abbreviated version of this post revised & published in Edible Northeast Florida, click here. ) Since tomatoes along with other spring favorites like squash, corn, green beans, cucumbers, peppers, and the like are "frost sensitive" (in other words, they'll die if it freezes), it's all about the "last frost date" for your area. Unless you're a weather savant and remember the last freeze for the past twenty years, you'll have to do some investigating. You could look up your Plant Hardiness Zone on this cool "interactive" map from the USDA, and you'd learn that Jacksonville is in zone 9a, Tallahassee is in 8b, and At...