How to Add Compost to an Established Garden

Digging up plants to till in compost is extreme — only for severe cases. For 99% of "tired" established gardens, simply top-dress with a thick compost layer.

Use lightweight, crumbly compost (avoid heavy muck). Spread 3 inches everywhere. If self-seeders are a concern, go thinner in spots but plan to add more in fall and next year. Soil organisms feed on partially decomposed material, gradually improving soil below.