Question

What is mean by
biennials,annuals,perennials​

Answer 1

Answer:

Annuals live just one year from seed to death, biennials live two, usually not flowering until the second and perennials come back year after year.

Answer 2

Explanation:

Annual, Perennial, Biennial?

Annuals - Plants that perform their entire life cycle from seed to flower 

Annual Plains Coreopsisto seed within a single growing season. All roots, stems and leaves of the plant die annually. Only the dormant seed bridges the gap between one generation and the next.

Perennials - Plants that persist for many growing seasons. Generally the top portion of the plant dies back each winter and regrows the following spring 

Perennial Purple Coneflowerfrom the same root system (e.g. Purple Coneflower). Many perennial plants do keep their leaves year round and offer attractive borders and groundcover (e.g. Tickseed, Shasta and Ox-Eyed Daisy). NOTE: WHEN STARTING PERENNIAL PLANTS FROM SEED, BLOOMS WILL BE OBSERVED IN EITHER THE SPRING OR SUMMER OF THE SECOND YEAR AND EACH YEAR THEREAFTER (e.g. Ox-Eyed Daisy planted in the spring of 1996 will not bloom until the spring of 1997).

Biennials - Plants which require two years to complete their life cycle. 

Biennial FoxgloveFirst season growth results in a small rosette of leaves near the soil surface. During the second season's growth stem elongation, flowering and seed formation occur followed by the entire plant's death.