Check firmness by pressing the center of the head. Cauliflower Pick when curds are still firm but heads are 6 to 8 inches or more in diameter. Corn Corn is ready to pick when a kernel spurts milky fluid if punctured by your fingernail. Eat at once, since flavor and tenderness deteriorate rapidly after picking. Eggplant Harvest when 6 to 8 inches long, depending on the variety.
Most eggplants become rich purple and have a high gloss.
When the eggplant is ready to harvest, its skin is soft enough to break with a fingernail. Green pole beans Harvest pods when the seeds make bulges but the skin is still smooth and shiny. Check seed package instructions for variations. Harvest butterhead when the loose head has formed and head lettuce when the head is firm. Onions Garlic Harvest green onions when they are the thickness of a pencil.