gunnera or giant rhubarb plant on the margins of a pond

garden flower tree plant vegetation pond green shrub woodland jungle leaf yard forest backyard stream lawn wetland brazilian pattern leaves giant rhubarb dangerous foliage stem botanical tropical large botany chlorophyll rainforest pre historic dinosaurs invasive species south american architectural drawings deciduous marginal bog banned impact native nature reflection water gardening environment outdoors exotic spreading clump lobed perennial rounded roughtextured spiny stems giantrhubarb hardy herbaceous gunnera gunneraceae manicata margins sunlight margin cultivated