If you live somewhere prone to frost and snow ... as tender new growth late in the season can be damaged from freezing ...

While many evergreen shrubs are hardy, Palphramand says some can be vulnerable to frost damage, especially during severe cold spells. Examples include rhododendrons, azaleas and camellias.

azalea (Rhododendron spp ... to prevent these trees and shrubs from getting an early start and risking frost damage. If shrubs are small enough, they can be covered with frost-protection blankets ...

Fertilizing too heavily can cause root damage ... lace bugs or azalea whiteflies. Fertilizing too late in the summer leads to tender foliage growth that can be killed by an early frost.