Cacti cactus opuntia painful pear plant Prickly sharp spines thorns background danger texture abundance abundant agricultural-pest edible edible-prickly-pear fast-spreading food fruit fruiting glochids green green-fruit Indian-fig introduced moisture nopales opuntia-ficus-indica paddle-cactus perennial platyclades prickles prickly-pear prickly-pear-cactus-fruit red ripe ripe-fruit spikes textures weed bush Greece Greek invader mountains natural naturalised nature spring wild agricultural pest green fruit green. moisture paddle cactus prickly pear prickly pear cactus fruit feather ball garambulla garambulla cactus hatiora gaertneri hedgehog cereus knowlton's cactus lemaireocereus chich living rock lophophora williamsi mammillaria mammillaria plumosa mescal mezcal mistletoe cactus myrtillocactus geome night-blooming cereu nopal opuntia cholla orchid cactus pediocactus knowlton agriculture beautiful botanical botany Cactaceae close-up closeup color desert detail dry flora guest hurt indica leaf needle pain prick prickle snail spike spiky spine spiny succulent thorn thorny vegetable