Aesculus autumn bloom blossom buckeye castor chestnut fall green maroon spike spiky spring tree white bright bush countryside fields flower gorse landscape sharp summer thorn vibrant vivid yellow agave aloe coast flowering flowers head madeira natural nature orange red sea succulent cyprus dry mediterranean parched plant prickle Prickly spine spiny thistle wild Aesculus hippocastanum England horse chestnut pyramid stamens Sussex barbed barrier danger fence grey keep out metal railings security spikes top twisted wire appearances arid Cacti cactus clumps clusters coloring colors colouring colours display edge edges flora frilled frills garden-display garden-plants irregular leaves light ornamental perennials plants pointed protection ribbed ribbing ribs shape shapes short-spikes small-spines spines succulents sunlight surface surfaces textures unusual variations variety various barrel barrel-cactus round symmetry colorful colourful sky