Topsoil is a mixture of organic and inorganic material, water and minerals. Naturally made topsoil takes a century to develop. This mixture is what plants use for development, and it's important to know how to mix topsoil for optimum plant growth.
A Mixture of Topsoil and Planters Mix
Topsoil and planting mix provide stability for the roots and base of the plant, and a way for the plant to get water, minerals, nutrients and oxygen.
Topsoil can be purchased in a basic houseplant type formula. There are planting mixes available that are formulated for certain types of plants. Additives can be purchased to supplement basic potting soil, vermiculite, perlite or sand, for example, to make your own specially formulated planting mix.