Bastard Trenching – A Horticultural and Soil Cultivation Entry
Definition and Purpose
Bastard trenching is a double-depth soil cultivation technique used to improve soil structure, aeration, and drainage. Unlike double digging, bastard trenching does not incorporate organic matter into the lower soil layers but instead loosens subsoil to allow better root penetration and moisture movement.
Method of Bastard Trenching
- Mark out the trench (typically 30–45cm wide).
- Dig out the topsoil (spade-depth, around 25–30cm) and place it aside.
- Loosen the subsoil underneath with a fork or spade but do not remove it.
- Replace the topsoil into the trench without adding amendments to the lower layers.
- Repeat the process for the next section of soil.
Benefits of Bastard Trenching
- Improves drainage in heavy soils.
- Encourages deeper root growth in crops and perennials.
- Reduces waterlogging without over-enriching subsoil layers.
- Enhances soil aeration without excessive disturbance.
Uses in Gardening and Agriculture
- Preparing vegetable beds and flower borders.
- Improving compacted clay soils.
- Establishing deep-rooted plants like roses and fruit bushes.
