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agricultural amenity trees Arbor Arbor Day arboretum Arboricultural Association arboriculture arboriculturists ash trees bark beech beetles beneﬁts Botanic Gardens branches Britain cause cent conifers Countryside Commission crown damage decay diameter difﬁcult disease Dutch elm disease ecological effects efﬁciency environment environmental established ﬁeld ﬁre ﬁrst ﬁve ﬂowering forest Forestry Commission frost cracks growing growth horticultural identiﬁed inﬂuence inventory landscape lime London maintenance methods National Nature Conservancy Council nature conservation nursery ofthe park phloem Phytopathology pine Pinus Platanus pollards pollution problems production protection pruning reﬂected repollarding root system salt sample scientiﬁc Scots pine shoots signiﬁcant signiﬁcantly Sitka spruce soil speciﬁc stem street trees stress survey techniques timber Tree City USA tree planting tree roots tree species trees and shrubs trunk urban forestry Volume wildlife wind wood woodland woodland management wound