Annuals are plants whose life cycle lasts only one year, from seed to blooms to seed. Removing the flowers as they fade prolongs the blooming cycle, but if left to produce seeds, many annuals will readily reseed themselves. Some plants are considered as annuals in the temperate areas, but they are perennials in the tropics.
Perennials are plants that can live many years, they grow in size and stature until reaching their full maturity. Although they live on longer, many perennials lose their vigor after 3-4 years, and should be replaced. Most perennial plants may be divided to produce new plants, or they may be grown from seeds or cuttings. Because of cold sensitive, many perennial plants in the tropics become annuals in temperate areas.