1.   A well defined form According to my dictionary, a tree can be any perennial plant having a self-supporting woody main stem.

2.   In a few years, most perennial plants benefit from being dug up, divided and replanted.

3.   Most perennial plants are sold in containers, while many larger trees and shrubs come with their root ball wrapped in burlap.

4.   The bluegrass, fescue and other turfgrass plants that make up a good lawn are perennial plants, meaning they come back year after year.

5.   The bluegrass and fescue breeds most people prefer in their lawns are perennial plants.

6.   The Earhart project, involving perennial plants and limestone, is intended to be permanent.

7.   These wind-pollinated annuals and perennial plants generate proportionally more pollen than trees.

8.   They are vigorous perennial plants with rough, handsome, deep green foliage.

9.   This is the best new American reference book for the legions of perennial plant lovers who want to know exactly what cultivar to buy.

10.   Wasabi, or wasabia japonica, is a perennial plant from the cruciferous family.