Trees 518 Arbres 92 Photography of trees 56 Trees in art 49 Forests and forestry 47 Ornamental trees 47 Identification 41 more ... Photography, Artistic 41 Forest ecology 40 Shrubs 39 Diseases and pests 35 History 32 Ecology 28 Trees in cities 28 Trees (Graph theory) 27 Wood 24 Tree planting 23 Plants 21 Ornamental shrubs 20 Tree houses 19 Forêts 18 Data processing 16 Pictorial works 16 Botany 15 Christmas trees 15 Arbres (Théorie des graphes) 14 Baum 14 Environmental aspects 14 Écologie 14 Growth 14 less ...