access-denied barrier coast coastline colors colours conservation conserve conserving cultivating cultivation dune-flora dunes environment environmental fence fencing flora grass grasses green greenery growing growth limited limited-entry natural nature ocean ocean edge planting plants protect protection protective reclaim reclamation rough salt-resistant sand sand-dunes sandy scrub vegetation replanting bushland sign flora protection illegal law legal non-removal prosecution rusty sign background beach coastal communication contrast contrasting direction directive foliage light signs tides Australan Australian native flora blooms blue blue and green blue flowers bright brilliant bush plant colorful colourful display flowers ground cover leaves native protected spring wildflowers Australian bushes danger edges leaf leafed pain Prickly shrubs spikes spiky spines texture textures thick