Custom-blended soil mixes are crucial to any greenhouse.

Peat moss added to soil increases its water-holding capacity.

Perlite is used to make soil light and airy and to enhance soil drainage; it also adds water-retaining properties.

Coarse sand adds heft and enhances soil drainage.

Manure increases soil fertility.

Greenhouse cleanliness is a must; old potting soil should never be reused as it can introduce pests into the greenhouse.

Dead plant materials should be removed immediately from the greenhouse.

Pots should never be reused without thorough cleaning. Sterilization is crucial to keeping plants free from pests. A thorough soaking for 10 minutes in a solution of nine parts water to one part bleach, followed by a good scrub, will clean most pots. Mineral deposits remaining on clay pots can also be removed with a commercial solution such as CLR.