Related by context. Frequent words. (Click for all words.) 64 cheatgrass 61 spotted knapweed 60 salt cedar 59 tamarisk 57 loosestrife 57 leafy spurge 57 purple loosestrife 56 Hydrilla 56 Poison ivy 56 forbs 55 Aphids 55 adelgid 55 Gypsy moths 55 woody plants 55 jack pine 55 invasive weed 55 knapweed 55 barberry 54 grasses 54 lupine 54 buffelgrass 54 Scotch broom 54 knotweed 53 fireweed 53 shrub 53 Phytophthora 53 invasive weeds 53 bark beetle 53 spurge 53 temperate zones 53 lodgepole 52 nonnative plants 52 understory 52 saltcedar 52 Invasive species 52 Rhododendrons 52 perennial grasses 52 pampas grass 52 pigweed 51 arid regions 51 Japanese knotweed 51 skunk cabbage 51 adelgids 51 hemlock woolly adelgid 51 sagebrush 51 Switchgrass 51 lodgepole pine 51 vegetation 51 garlic mustard 51 fungus 51 evergreen shrub 50 junipers 50 giant salvinia 50 noxious weed 50 spider mites 50 Eurasian milfoil 50 invasives 50 herbaceous plants 50 deciduous tree 50 ponderosa 50 aspen 50 lupines 50 invasive species 50 hackberry 50 shade tolerant 50 Feral hogs 50 insect pest 50 arid lands 49 ornamental grass 49 shrubby 49 tall fescue 49 aspen trees 49 alkaline soil 49 monocultures 49 phragmites 49 anthracnose 49 hemlock trees 49 coniferous 49 vetch 49 lichen 49 chaparral 49 ponderosa pines 49 bermudagrass 48 cottonwood 48 privet 48 prairie grass 48 Glyphosate 48 bollworm 48 Vegetation 48 European corn borer 48 insect pests 48 mountain laurel 48 nitrogen fixing 48 duckweed 48 whiteflies 48 Nematodes 48 Soybean rust 48 manzanita 48 groundcover 48 Canker 48 bluestem