October Cover Cropping: Which Green Manures to Sow This Month
As summer crops come out and garden beds empty, October is the perfect time to give your soil some TLC—not with fertilizer, but with living plants! Sowing green manures (cover crops) this month protects and rejuvenates your beds, setting the stage for healthier, nutrient-rich soil in spring. Here’s what to sow, why cover cropping matters, and how to do it right for the October garden.
Why Sow Green Manures in October?
- Weed suppression: Dense, fast-growing cover crops crowd out winter weeds.
- Erosion prevention: Living roots bind soil, protecting bare beds from autumn/winter rain and wind.
- Soil improvement: Cover crops aerate and break up heavy soil, add organic matter, and some (like clover) fix nitrogen.
- Easier spring planting: Decomposed cover crops make for softer, more fertile ground come April.
Best Green Manures to Sow in October
Winter Rye (Secale cereale)
- Dense, winter-hardy, fast to establish.
- Excellent for heavy clay or dug-out veg beds.
- Deep roots break up compaction.
Field Beans (Vicia faba)
- Robust, reliable legume—fixes nitrogen (perfect before brassicas).
- Sow in rows or blocks; chop down in early spring.
Crimson Clover (Trifolium incarnatum)
- Hardy, nitrogen-fixing—loved by pollinators in spring.
- Beautiful spring flowers if left to bloom.
Winter Tares (Vicia sativa)
- Fast and fluffy growth; builds up soil nutrients.
- Chop and dig in before flowering.
Phacelia (Phacelia tanacetifolia)
- Quick to sprout, suppresses weeds, produces masses of bee-friendly flowers if overwintered and left till spring.
Mustard (Sinapis alba)
- Quick cover, helps control some pests and soil-borne diseases.
- Not reliably winter-hardy everywhere; best for short-term cover ahead of frost.
How to Sow Green Manures in October
- Clear beds of spent crops and weeds.
- Rake soil to a fine tilth—no need to add fertilizer.
- Broadcast seed evenly or sow in rows, following the packet’s sowing density for each type.
- Cover lightly with soil and water in if dry.
- Mulch edges with leaves or straw for added protection.
What to Do in Spring
- Chop down green manure plants before they flower and go woody (usually March–April), leaving top growth as a mulch or digging in to rot down.
- Beds are ready to plant within 4 weeks of digging in.
Where to Use October Cover Crops
- Empty vegetable beds.
- Rotating areas in perennial borders.
- Bare soil between rows of trees or shrubs.
Wrapping Up
October-sown green manures are the low-effort secret to richer, easier-to-work soil and weed-free beds next spring. With just a scattering of seed now, you’re giving your garden a winter coat that pays back big time at planting!