Watermelons are considered to be a “true annual” crop, which means that they really cannot live any longer than one year in the event that they prevented from setting seed.

There are a number of other crops which are also considered to be true annuals, including beans, peas, corn, lettuce, marigolds, and a number of others. There are numerous other types of melons that grow annually as well.

You will find that there are actually quite a few fruits that are true annuals because of the way they grow and how long they are able to live, which is usually a period of time not exceeding one year.