Related by context. Frequent words. (Click for all words.) 63 salvinia 62 Hydrilla 62 water hyacinth 61 aquatic weeds 60 aquatic weed 59 alga 59 Eurasian milfoil 58 knotweed 57 duckweed 56 hyacinth 56 fireweed 56 Eurasian watermilfoil 56 Japanese knotweed 55 cattail 55 freshwater mussels 55 sedge 55 algae 55 sea squirt 54 Didymo 54 snails 54 microscopic algae 54 loosestrife 54 reed beds 54 Milfoil 54 rock snot 53 giant salvinia 53 Scotch broom 53 phragmites 53 pampas grass 53 acacias 53 oxalis 53 parasitic worms 53 weevils 53 hydrilla 53 sea slugs 53 Zebra mussels 53 snail 53 barberry 53 invasive weed 53 mussels 52 fern 52 bulrush 52 grasses 52 cankers 52 stinging nettle 52 wattles 52 bulrushes 52 purple loosestrife 52 algal blooms 52 Invasive species 52 insect larvae 52 Larvae 52 Cane toads 52 bivalve 52 hyacinths 52 salt cedar 51 aquatic vegetation 51 Algae blooms 51 Nile perch 51 sphagnum moss 51 algal bloom 51 micro organism 51 spp 51 skink 51 waterbirds 51 saltmarsh 51 naturally occurring bacteria 51 brine shrimp 51 snakehead fish 51 Cyanobacteria 50 sedges 50 invasive species 50 chickweed 50 seagrasses 50 mollusc 50 marsh grasses 50 periwinkles 50 mycelium 50 hemlock woolly adelgid 50 Gypsy moths 50 stinging nettles 50 anemone 50 molluscs 50 protozoan 50 biota 50 spotted knapweed 50 flora 50 willows 50 crayfish 50 chytrid fungus 50 eelgrass 50 eucalypts 50 sea squirts 50 skunk cabbage 50 fungi 50 tamarisk 50 seaweed 50 fungus 50 ragwort 49 tadpoles 49 giant hogweed