Answer: Annuals reseed and start anew each year from those seeds: the seeds sprout, the resulting plants grow and reach maturity, produce a crop of seeds and then die all in one season. Sometimes a certain spot is so well suited to a particular annual that it will self-sow and come up every year in the same spot so that it nearly seems perennial!
Perennials are plants that literally survive from year to year by overwintering and putting out new growth each year during the growing season. These plants tend to require a full year's growth before they are able to flower and consequently produce seed and they also tend to survive for three to five years or even longer.
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