agave arid Cacti cactus cliff difficult dry endurance endure face Funchal green hard madeira natural nature pear plant Prickly rock sere sharp spine spined spiny succulent survival survive tough arching Australian black boy bush bushland dumbbell flowers evergreen flowering fragrant grass tree Kingia australis layers mantle multiple flower stalks outback resin slow-growing spike spiny leaves stout trunk tall unusual abstract background brown descending dried fronds hanging layered leaf leaves lines remainder spiky strands texture vegetation Xanthorrhoea alpine armour armoured Asteraceae Carlina acaulis carline dicotyledon Eberwurz edible europe fortune Good humidity hunter's bread hurt indicator medicine needles perennial rosette silver thistle star stemless sun thistle thorn thorny traditional angled angles appearance light rigid standing straight sunlight thorns upright wallpaper wild black-boy bush-plants corner garden grass-tree ground-cover multiple-flower-stalks native-plants plants raised-garden spikes spiny-leaves stout-trunk trimmed Xanthorrhoea-preissii appearances clumps clusters coloring colors colouring colours display edge edges flora garden-display garden-plants irregular ornamental perennials pointed protection shape shapes short-spikes small-spines spines succulents surface surfaces textures