agricultural pest cactus fast-spreading food fruit glochids green fruit green. moisture introduced nopales opuntia paddle cactus platyclades prickles prickly pear prickly pear cactus fruit spikes spines textures anchorages anchors boat chair desert flowers garden goiter goiters goitre green oar paddle plants rowing rudder sand ship abundance abundant agricultural-pest edible edible-prickly-pear fruiting green-fruit Indian-fig moisture opuntia-ficus-indica paddle-cactus perennial prickly-pear prickly-pear-cactus-fruit red ripe ripe-fruit weed