a. Summer pruning:

Caragana

Pea Shrub Daphne

Deciduous Daphne Halesia

Silver Bell Koelreuteria

Varnish Tree

Laburnum vulgare Golden Chain

Lonicera tatarica Tartarian Honeysuckle

Magnolia

Magnolia Makonia

Oregon Grape

Prunus cerasus Flowering Cherry

Pyracantha

Evergreen Thorn

Rhododendron Rhododendron

Staphylea Bladder-nut

Xanthoceras Chinese Flowering Chestnut b. Winter pruning:

Aralia

Angelica Tree

Artemisia Wormwood

Cladrastis Yellow-wood

Pavia Dwarf Horse-chestnut

Robinia Pseudacacia Black Locust

Yucca Adam's Needle

C. Trees Which Require Little or No Pruning:

Aesculus

Horse-chestnut

Catalpa

Indian Bean

Liriodendron Tulip Tree

Paulownia

Empress Tree Robinia

Locust

Sophora

Pagoda Tree

Sorbus Mountain Ash

D. Evergreens That Should Be Pruned in May or June:

Abies Fir

Picea Spruce

Pinus Pine

E. Evergreens That May Be Pruned at Any Time:

Chamaecyparis Cypress

Juniperus Juniper

Taxus

Yew Thuja

Arborvitae