The proper time to harvest some vegetable crops is fairly easy to determine.
Tomatoes turn red when ripe.
Onions are harvested when the tops fall over and begin to dry. While some vegetables exhibit clear signs, the proper time to harvest other crops may require a little more knowledge and experience. Guidelines for harvesting and storing various vine crops are presented below. This color change is especially pronounced on the dark green skinned varieties. It is often less noticeable on lighter skinned watermelons.