Related by context. Frequent words. (Click for all words.) 65 invasive weeds 63 cheatgrass 60 noxious weeds 59 invasives 59 cottonwoods 58 vegetation 58 noxious weed 58 junipers 57 cottonwood 57 bark beetles 55 conifers 55 sagebrush 55 willows 55 garlic mustard 55 invasive species 55 cottonwood trees 54 mesquite 54 aspen 54 milfoil 54 understory 53 weevils 53 woody plants 53 weeds 53 hydrilla 52 weevil 52 ponderosa pine 52 beetle 52 shrub 52 hardwood trees 52 juniper 51 beetles 51 grasses 50 hemlocks 50 cattails 50 rangeland 50 grasslands 50 rangelands 49 pine beetle 49 native grasses 49 groundcover 49 lupine 49 aspens 49 zebra mussel 49 caterpillars 48 prickly pear 48 zebra mussels 48 gypsy moths 48 aphids 48 Vegetation 48 shrubs 48 aphid 48 gypsy moth 48 wildflowers 48 herbicides 48 grasshoppers 48 conifer 48 cacti 48 honeysuckle 48 cactus 48 prescribed burns 47 insects 47 milkweed 47 mountain pine beetle 47 sumac 47 grassland 47 revegetation 47 chaparral 47 insect pests 47 nematodes 47 thistle 47 hardwood forests 47 feral pigs 47 trees 47 prairie grass 46 underbrush 46 kudzu 46 pests 46 weed 46 lantana 46 powdery mildew 46 seed pods 46 leaf litter 46 insect 45 mosquito larvae 45 biofuel crops 45 forest thinning 45 willow trees 45 deciduous trees 45 thistles 45 lichen 45 thrips 45 acacia 44 eucalyptus 44 borer 44 ferns 44 root rot 44 elms 44 herbicide 44 eucalyptus trees 44 pecan trees 44 flora