bush Cacti cactus Greece Greek invader mountains natural naturalised nature opuntia pear plant Prickly spring wild conifers countryside England english forest Great Britain pine rhododendron summer Sussex trees woodland Australia botany flower grass magenta Melbourne oxalis petal pink Terrestrial plant wood sorrel Acer amber autumn branch colour fall leaf leaves maple tawny tree yellow border ecology edge eucalyptus green home house margin peace quality shade sunlight villa wooden flowers fronds palm