How to Double Dig a Bed
This widely popular technique of bed preparation will ensure healthy roots, beautiful blooms, and a bountiful harvest. Popularized by John Jeavons of Ecology Action in his book "How to Grow More Vegetables than you ever thought possible, on less land than you can imagine"
The Grow Biointensive site has added a Self-Teaching section with a handbook and videos that you may find helpful.
Community Crops beds are dug 3-4 ft wide and 8-20 ft in length. The width provides a manageable distance for working in the bed without ever having walk in the bed again. This helps to alleviate soil compaction, keeping air space in the soil at an optimum 50%.
Double Dig Instructions
1. Dig a trench one shovel-length deep (nine or ten inches) and the length of your planting area.
2. Pile the soil in a wheelbarrow. (ours piled in front of first trench, although wheelbarrow makes it easier to transport to last trench at end of double dig.)
3. Loosen the soil at the bottom of the trench another nine to ten inches. (Spading fork works great for this)
4. Add organic material, such as compost, and any necessary soil amendments. Using a spading fork, thoroughly mix them into the subsoil.
5. Dig a second trench parallel to the first and repeat steps 2 and 3.
6. Use the topsoil from the second trench to fill the first one, adding more organic matter and mixing it in.
7. Repeat the procedure until you've dug, enriched and amended the entire planting area.
8. Fill the last trench with the topsoil you put in the wheelbarrow when you dug the first trench, enriching it with organic matter as you did before.
Visit the Grow Biointensive Website for more information and to order John Jeavon's books at: http://www.growbiointensive.org