DENDROLOGY

Detailed explanation-1: -A perennial plant or simply perennial is a plant that lives more than two years. The term (per-+-ennial, “through the years") is often used to differentiate a plant from shorter-lived annuals and biennials.

Detailed explanation-2: -If given proper growing conditions and good care, long-lived perennials often persist for 20 or more years. Short-lived perennials usually disappear within 10 years.

Detailed explanation-3: -Perennials are plants that can live longer than 2 years. They may go to seed every year, may die back to the ground in winter, but their root systems are very much alive and come back the following spring.