Cut bulbing fennel at soil level when the bulbing base becomes knobby and rounded and about 3/4 the size of a tennis ball or larger. After harvesting each bulb, cut the ferny leaves down to the stalk, then slice up the juicy bulb to use fresh or cooked.
Salad and Stir-Fry Greens:
Mixed greens such as mesclun salads, stir-fry greens or lettuce mixes can be picked as tiny 2” baby thinnings. Otherwise, use the "Cut and Come Again" method: wait until the young plants are just 4-7” tall: then cut across the whole bed with a scissors to harvest, leaving the bottom 1 to 2 in. of plants in the soil. Water well, and fertilize lightly. The cut crowns of the plants will regrow for successive harvests. These mixed greens can sometimes taste bitter after several cuttings, particularly in very hot weather, so make successive sowings every few weeks for a constant supply of tender young leaves. Spicier leaves like arugula, taste mildest in cool spring or fall weather.
Endive and Escarole: Plant these greens in mid to late summer for a fall harvest. Cut whole heads of endive and escarole when they begin to fill with lighter leaves in the center. Some gardeners tie or rubber band the outer leaves around the center and leave them closed for about a week to blanch and sweeten leaves inside. Cold-weather makes these leafy greens even more crispy-sweet and succulent.
Radicchio: Cut the inner heads of radicchio in late fall before a hard frost when they are firm, round and colored deep red and white. If you pick them too early when leaves are still red and green, they will taste quite bitter.
You can start picking the outer leaves of kale when the plants are sturdy and well established. Be sure to leave seven or eight leaf crowns to regrow after harvest.
Harvest tender baby leeks when they are about 1/2-1” thick or continue to let them thicken. Make sure to pick them before they begin to send up a flowering stalk, or else they’ll be much too tough to eat. Keep leeks well weeded, watered and fertilized, and hill up the soil around the base for a longer, blanched white shaft, which is more delicate than the tougher green upper leaves.
: Pick lettuce in the cool early morning while they leaves are still crisp. Lettuce can be harvested as delicate baby greens, or as crisp, full-bodied heads. To harvest by the "Cut and Come Again," method, cut with a scissors when lettuces reach about 4-5 inches tall to about 2” above the soil line. Water well and fertilize lightly to enjoy several additional cuttings. Harvest whole heads of lettuce when they start to fill in at the center but before they begin to elongate at the center and "bolt" (send up a flower stem), at which point they’ll taste bitter.
The perfection of a melon is so fleeting, that finding a perfectly ripe melon every time is a fine art. Pay close attention when picking so you learn what factors indicate the tastiest fruits. If you consistently have trouble growing tasty melons in your area, it may be that your climate is too cool. Grow them on black plastic or over a rock wall, and experiment with different varieties to find the best for your region.
Cantaloupes: Pick when they heavy and tan-colored with a slight yellowish cast. When ripe, a cantaloupe’s netting becomes harder and raised, and a crack forms around the stem where it touches the fruit. The melons should slip easily off the vines with a quick pull, but should not have already fallen off. The fruits get slightly softer at the bottom end and they smell fragrant.
Honeydews should have a slight yellow blush on their ivory rinds when ready. They also get slightly softer at the blossom end. Unlike muskmelons, honeydews do not slip off at the stem so must be cut from the vines.
Galia melons turn from green to a golden color on the surface of the fruits and smell fragrant.
Watermelons develop a dull green cast and have a light patch at the bottom that changes from green to light yellow when mature. Also, the leaf on the tendril nearest the fruit turns brown and withers. The skin should be hard – difficult to pierce with a fingernail. Some people say they can knock on a melon to detect a perfect hollow tone.
Pick young scallions when they are 10-12” tall. For large storage onions, wait until about half the topshave started to die back and have fallen over. Knock the remaining tops over and let them stay in the ground for another week. Harvest and store in a cool, dry, airy place. Cut off the tops and shorten the roots when the skin and tops are completely dry.
Pick peas in the morning at least every other day for maximum harvest and crispest texture.
Shelling Peas: Pick them when the pods are rounded and the peas have filled the pod – but before they grow too large and tough.
Snap Peas: Wait until the flat edible pods begin to grow rounded, plump and juicy – but before the peas inside get too big and tough. You’ll notice that the pods will not taste sugary enough if the pods are picked too early and flat.
Snow Peas: Pick them when the pods have grown to size but are still quite flat.
Sweet peppers taste much sweeter and are most nutritious when they’ve been allowed to fully color up from green to glowing red, orange or yellow on the vine, depending on variety. If your growing season is too short for peppers to ripen completely, pick your last green peppers as late as possible and keep in a cool place to color up, checking them often for rotting. Chile peppers also develop their full pungency and fruitiness when fully colored, but can be harvested shiny green as soon as they’ve grown to size.
Pumpkins and Squash
Pumpkins: Harvest pumpkins when the fruits are deep orange and the shells are so hard that they can’t be pierced with a fingernail. Cut a 2-3” stem handle, let cure for 10 days in the sun or a warm, dry room (do not expose to frost) and store in a cool, dry place at around 50 degrees.
Summer Squash: Smaller is better when it comes to summer squash. The longer the fruits remain on the vine, the tougher on the outside, seedier and more watery they become on the inside. Even the most ardent zucchini bread bakers will probably not want to grate and freeze too many baseball-bat sized fruits! So pick zucchini no larger than 6 or 7". Pick patty pan squash at 2-3”, round zucchini at 3-4", and longer trombetta squash at 12-14".
Winter Squash: Pick winter squash when rind is deeply colored and the shells have become so hard that you can’t pierce them with your fingernail. Cut a 2-3” stem handle, let cure for 10 days in the sun or a very warm room (do not expose to frost) and store in a cool dry place at around 50 degrees. Some varieties which store less well such as acorn squash should be consumed in the fall; the flavor and texture of many other varieties such as Kabocha and Butternut improves in storage.
: Spinach grows best in cool weather. To harvest by the "Cut and Come Again," method, cut young spinach when it is about 5-6” tall to about 1” above the soil line and plants will regrow for another cutting. Or you can start harvesting outer leaves as soon as the plants have at least 5-6 full-size leaves, always leaving at least four to five leaves on the plant so it can regrow handily. By harvesting frequently with one of these methods, you will extend the period in which the plant produces leaves before it sends up a flower stem and "bolts.
For best sun-ripened flavor, pick tomatoes when they are richly colored and have no trace of green on the skin. If, however, you are experiencing alternately wet and dry weather and are concerned about cracking of thin-skinned heirlooms, you can pick them when they are just blushed with color and let them ripen indoors (not in the refrigerator). Tomatoes taste best where days and nights are warm—otherwise delicious varieties can taste bland where nights are cool or in years when the sun refuses to shine! For best flavor and texture, do not store ripe tomatoes in the refrigerator. (I like to pile them in a big colorful bowl or basket and use as a kitchen centerpiece).