Herbaceous Plants with non-woody stems. Their above-ground growth usually dies back in winter in the temperate zone, even in cases where the plants in question are perennials.
Biodiversity The variety of life on earth across all of the different levels of biological organization.
Perennial Plants that survive the winter, even if their above-ground growth dies back.
Annual Plant that dies altogether at the end of the growing season, both above the ground and below it.
Bedrock The solid rock that lies under the surface of the ground
Sandy soil Soil comprised of particles that retains little water and aerates well because of the large size of its particles.
Gravelly soil Small stones and pebbles, or a mixture of these with sand