What are Perennial plants?
Characteristics
The term perennial is most often used when referring to smaller non-woody, flowering plants.
However, technically, any plant species that lives for more than two years is classed as a perennial, including trees and shrubs.
Tender perennials are plants which can live for more than two years in their native environment. However, they may not persist in colder climates where winters are harsher. Typically, in this case, tender perennials are grown as annuals or require overwintering care.
Perennials that die back for the autumn or winter and return the following spring are called herbaceous perennials.
Perennials that keep their foliage throughout the year are called evergreen perennials.
There are many species of perennial plants, ranging in almost every aspect.
It's worth noting that not all varieties of a particular plant are always perennials. Take poppies, for example, the oriental poppy (Papaver orientale) is a perennial plant, but the common poppy (Papaver rhoeas) is an annual.