abundance abundant agricultural-pest cactus edible edible-prickly-pear fast-spreading food fruit fruiting glochids green green-fruit Indian-fig introduced moisture nopales opuntia opuntia-ficus-indica paddle-cactus perennial platyclades prickles prickly-pear prickly-pear-cactus-fruit red ripe ripe-fruit spikes spines textures weed agriculture background beautiful botanical botany Cactaceae close-up closeup color danger desert detail dry flora guest hurt indica leaf nature needle pain plant prick prickle Prickly sharp snail spike spiky spine spiny succulent texture thorn thorny vegetable