Double digging refers to which practice?

• A. Shallow raking
• B. Deeper than single digging
• C. Mixing mulch into topsoil
• D. Removing topsoil

Answer: (B)

Double digging is about creating a deep, friable rooting zone to improve drainage and root penetration. It goes deeper than a standard single dig. The method involves lifting out a layer of topsoil, loosening the subsoil to about the same depth, then turning the loosened subsoil into the trench and replacing the topsoil on top. This breaks up compacted layers, especially in heavy or clay soils, giving roots access to water and nutrients deeper in the bed.

Shallow raking only affects surface debris and doesn’t relieve deeper compaction. Mixing mulch into topsoil adds organic matter but does not create that deeper, loosened root zone. Removing topsoil destroys soil horizons and isn’t part of the double-digging approach.