How Do I Figure Out How Much Topsoil I Need?. Gardeners and farmers refer to the top layer of soil as topsoil. They amend and improve this layer of soil to be rich in nutrients and of the right composition for the plants they grow.
Ammi Majus (Bishop's flower) has lacy, white flowers, like a more delicate form of cow parsley. Ammi Majus is the best white filler-foliage plant you can grow and spectacular arranged in a great cloud on its own. It forms larger, more prolific plants from an autumn sowing.