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What weeds do
Characteristics of weeds 1
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adaptations amongst annual weeds arable areas Avena bindweed black-grass buds cereals chancellor chapter characteristics charlock chromosome Cirsium arvense colonization common chickweed common couch common poppy competitive ability Compositae containing creeping thistle crop plants Cruciferae cultivation depth dispersal disturbed effects of weeds environment evolution of weeds example experiments with weeds factors fat-hen field bindweed flower fragments garden genetic germination germination requirements Gramineae ground-elder growth habitats heterozygosity important INTERFERENCE WITH CROP large proportion losses number of weed nutrients overwinter particular perennial weeds perforate St John's period pests Plantago lanceolata plantains plasticity Polygonaceae Polygonum polyploid possible pots problem produce regeneration relation relatively repens rhizomes roots Rumex Salisbury samples seed dormancy seed germination seed production self-pollination serious weed shepherd's purse shoots situation spread of weeds St John's wort successful weeds survive variable vegetative reproduction weed biology weed flora weedy species whilst White mustard winter wild oat