Seedling Helper Seedling Helper Plants are tough, and seeds and seedlings can sprout, survive and grow under a variety of conditions. Here are some of the basic needs seeds and seedlings have. A handy Germination Chart is at the end of this article. Types of potting soil All-purpose potting mix has composted bark, peat moss or peat humus added to loamy soil.
Gardeners usually add ingredients to customize mixes - like extra peat moss, sand, perlite, etc.
More bark and peat and less soil make it lighter. Perlite and vermiculite give it better drainage and aeration. Many contain a wetting agent for uniform water distribution. Professional mix has the same materials as the premium types but is more finely processed. It works well for starting seeds or transplanting delicate seedlings.