agave agave-attenuata appearance background century-plant curved flower flowering foliage foxtail garden garden-plant gardens hardy large-flower lion's-tail mexican ornamental plant plants popular rare stem suburban succulent-like swan's- neck Aizoaceae angular-pigface Cape-fig carpobrotus-glaucescens coastal creeping-succulent daisy-like-flowers drought-resistant dune-stabilizer edible fire-resistant fleshy flora flowers food groundcover Hottentot-plant ice-plant invasive medicinal nutritional open perennials pigface pink-purple plant-mat prostrate salt-substitute salt-tolerant sand-dunes sand-stabilizer smooth-leaves sour-fig strand-ivy succulent sunlight sunshine thick triangular-leaves yellow bee bees insect insects bracts devil's backbone drought tolerant garden plant green houseplant Jacob's ladder lady’s slipper leaves pedilanthus tithymaloides pink pointed tips shaped like pink slippers shrub slipper flower sub-tropical tropical unusual upright variegated zigzag plant zigzag stems