background colorful colourful fast-growing flowerheads garden shrub hardy Lantana noxious weed pink showy shrub texture textures thicket tubular flowers weed weed of significance orange yellow bee gathering insect nectar bright clusters danger dark foliage golden green light sunlight air breathe chimney climate cloud dioxide dirty ecological ecologically ecology emissions exhaust fuel fumes gas global harmful health industrial industry intoxication noxious ozone pipe poison poisoning pollution power precipitation smog smoke snow steam substance toxic trees warming white winter annual arctotheca calendula cape daisy cape dandelion cape gold cape marigold cape weed competitive daisylike edible flowers groundcover hairy stems herb invasive-weed leaves lobed basal leaves noxious-weed ornamental petals plant prolific rosettes spreader squat perennial stolons taproot vigorous arctotheca-calendula cape-daisy cape-dandelion cape-gold cape-marigold cape-weed capeweed hairy-stems lobed-basal-leaves squat-perennial abundance African wood-sorrel Bermuda-buttercup Bermuda-sorrel buttercup-oxalis Cape-cowslip Cape-sorrel cotyledon English-weed goat's-foot groud-cover invasive oxalis oxalis-pes-caprae reflections sorrel sourgrass soursob soursop trifoliate-leaves tristylous-flowering-plant weeds wood-sorrel yellow-sorrel