Cereal rye is the strongest weed-suppressing cover crop — it grows tall, dense, and produces allelopathic compounds that inhibit weed germination for weeks after termination. Buckwheat is the best fast-summer weed suppressor for short windows. Mustards work well for biofumigation. Multi-species mixes outperform single species over a full season.
Crop calendar pages cover cereal rye and buckwheat planting windows.
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