England english Great Britain landscape marsh marshland marshy natural nature pond pool spring water weed wet abundance African wood-sorrel Bermuda-buttercup Bermuda-sorrel buttercup-oxalis Cape-cowslip Cape-sorrel cotyledon English-weed goat's-foot groud-cover invasive noxious-weed oxalis oxalis-pes-caprae reflections sorrel sourgrass soursob soursop trifoliate-leaves tristylous-flowering-plant weeds wood-sorrel yellow-sorrel flora flowering flowers yellow abstract African-wood-sorrel background grass green greenery ground-cover african balance bermuda botanical botany buttercup cape flower garden peaceful purple springtime summer blocked clogged cloud dark eerie grow growth lilies lily Michelham moat overgrown priory sky stagnant Sussex waterlilies waterlily waterway waterweed