You can also plant same crop successive plantings. This would be several smaller plantings at timed intervals. This method works well with lettuce and other salad greens. Succession planting works well for vegetables, some herbs and flowers.
The article below from Rodale’s Organic Life website, gives some wonderful details on succession planting.
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Create a Planting Schedule
Assembling all of this crop information into a planting plan is a bit like putting together a giant jigsaw puzzle of the garden. Simplify things by drawing a spring, summer, and fall diagram of each bed. Begin plugging vegetables into the diagram, with early, quick crops followed by long-season ones. Be sure to note the approximate date each crop needs to be sown or transplanted and when the expected harvest date is.
Vegetables that belong to the same plant family (such as cabbage, mustard, and kale) share pests and diseases. It’s wise to keep in mind what family a vegetable belongs to and avoid planting one member, say tomatoes, in the same spot where a cousin—peppers, eggplants, potatoes, or tomatillos—grew in the previous 3 years.
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Read the full article at: Rodale’s Organic Life