Glossary, Soil & Water Quality
Loam
Short definition
Loam is fertile soil with a balance of sand, silt, clay and organic matter, which drains well and still holds moisture.
It is the soil most plants find easiest. Garden loam is a rarity in desert ground, so planting beds are often improved with compost.
Why it matters
Potting mixes are not loam, but many aim for a similar balance of drainage and moisture.