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acid Agricultural Research Service allotment gardens annuals Arboretum areas azaleas Bermudagrass birds bloom bluegrass bulbs camellias chemicals climate color compost crops cuttings cytokinin damage disease effect environment environmental evergreen fertilizer flowers foliage Forest fruit garden clubs germination gibberellin grass green greenhouse ground cover grow grown hardiness hardiness zones home garden horticultural hybrids inches insects Kentucky bluegrass land landscape lawn leaf leaves light living Melwood ment mulch natural nematodes nitrogen nurseries nutrients organic matter ornamental plants outdoor park patio perennial pests planning plant growth plants propagated problems propagated pruning red fescue regions require resistant rhododendrons roots screen season seed seedlings selection shrubs small gardens soil space species spring stem summer surface temperature tion towns trees and shrubs turf types U.S. Department urban varieties vegetables Washington weeds Widely adapted winter yard Zone zoysia