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 appearances arid Cacti cactus clumps clusters coloring colors colouring colours display edge edges flora garden-display garden-plants irregular leaves light perennials protection shape shapes succulents surface surfaces textures unusual Acer dainty delicate England english filigree Great Britain leaf nature red shrub spring tree adorned bearded colorful colourful decorative dots flowers garden flower gardening horticulture inflorescences iris irises lines patterns perennial herbs petals purple rhizomes triplets veining white artistic box bush bushes Buxus clip clipping clippings cut cutting cuttings green hedge hedgerow leisure man ornate shears shrubs summer topiary work pointed