Group 1
Plants that DO NOT regularly produce replacement growth from the base.
Group 2
Plants that produce flowers from previous season’s growth.
Group 3
Plants that produce flowering spurs on old wood.
Group 4
Plants that produce flowers on the current year’s growth.
Group 5
Deciduous shrubs grown for decorative stems or foliage effect.
Group 6
Evergreen shrubs grown primarily for foliage effect.