Warm season vegetables, or summer vegetables, can occupy a garden systematically. A few lingering cool season vegetables may continue production for a while. Warm season vegetable plants can replace them as they finish. Several warm season vegetable plants should start as early as possible. Others grow in a few later phases through their season.
For example, indeterminate tomato plants are productive throughout their entire season. They can start as soon as convenient. However, determinate tomato plants produce only for two weeks or so. After their initial phase of a single plant or a few, subsequent phases can start about every two weeks. Each phase continues production after its predecessor.
Bush bean and several varieties of eggplant and pepper also produce for brief seasons. Okra and cucumber might produce for most of summer. Secondary phases may increase their production as well though. Of all warm season vegetable plants, corn benefits most from phasing. Each phase tends to mature so uniformly that it finishes within a few days.
Pole bean, squash, some cucumber and Indeterminate tomatoes need no phasing. Such warm season vegetable plants perform from spring planting until frost. Winter squash are warm season vegetable plants, but their fruit finishes for autumn. Indeterminate tomatoes are less profuse than determinate types. Cumulatively though, they are more productive.
It will soon be time to sow seed for corn, beans, root vegetables and most greens directly into garden soil. Seedlings for these warm season vegetable plants are not conducive to transplant. Besides, too many are needed. Cucumber and squash grow either from seed or small nursery seedlings. Only a few plants are needed, and they transplant efficiently.
For the same reasons, tomato, pepper and eggplant can grow from seedlings rather than seed. Moreover, since they are so vulnerable as they germinate and begin to grow, seed is less practical than seedlings. Varieties that are unavailable at nurseries can grow from seed in flats inside or in a greenhouse. Ideally, they should have started early enough for transplant into a garden during appropriate weather.