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96 Berberis Abies American ARBORETUM BULLETIN Barberries bark beauty Berberis aggregata Berberis Thunbergii Berberis vulgaris berries bloom Botanical Garden BRAKELEY branches buds canadensis Chamaecyparis Chamaecyparis pisifera Chestnut Hill collection color conifers County crab cultivation deciduous Department of Botany disease Dryopteris Eastern evergreen feet Fern flowers foliage forest fruits fungi fungus green growing growth killed grubs hardy hedge Herbarium Himalayan pine Holly horticultural hybrid inches insects interest Japanese beetle japonica killed to ground leaves lecture Lilac Lonicera Magnolia Mahonia Malus MAURICE BOWER SAUL MORRIS ARBORETUM mycorrhizae native Nurseries occidentalis ornamental Penna Philadelphia Phlox Picea pink Pinus plants pruning Rehd Rhododendron RODNEY H roots Schneid season seed seedlings shade shrubs Sieb Sinkler soil species and varieties specimen spores spring Spruce summer surface Syringa Thuja occidentalis trees and shrubs Tsuga types UNIVERSITY OF PENNSYLVANIA Viburnum white pine wild WILLIAM McCLELLAND winter injury wood wounds yellow York Zucc