Missed the Green Manure Window? Winter Rye Still Works in October
Phacelia and mustard are past their window, but your empty beds don't have to face winter bare. Winter rye can still go in until early November.
Missed the green manure window in September? No drama. Phacelia and mustard die off at the first frost, but some species still germinate well now and hold soil and nutrients through winter. The classic choice is winter rye.
Why Phacelia and Mustard Are Too Late Now
Both are frost-tender and need several mild weeks after sowing to establish themselves. By the end of September that window has closed. Sow them now and you often get thin seedlings that the first frost finishes off.
Mustard has a second catch: it belongs to the brassicas, like cabbage and radishes. On beds where cabbage is planned for next year, it’s a poor choice for your crop rotation.
Winter Rye: Frost-Hardy and Undemanding
Winter rye germinates in cool conditions and shrugs off frost. You can sow it until early November. In harsh climates and at higher altitudes it’s already getting late, as mid-October would have been better there. Plan on roughly 15 to 20 grams of seed per square metre.
Its dense roots hold the soil together, reduce nutrient leaching and suppress the weeds that would otherwise take off first in spring.
How to Sow It
Loosen the surface with a digging fork or rake, clear crop residues and scatter the seed evenly by hand. Rake it in about 2 to 3 centimetres deep, press it down lightly and water once if the soil is dry.
On beds that still carry vegetables into winter, like leeks or Brussels sprouts, skip the seed and cover with leaves or mulch instead.
In Spring: Patience Before Planting
Once the rye reaches about 20 to 30 centimetres in March or April, and before it forms ears, cut it down and either work it in shallowly or leave it as mulch. Then wait: rye releases compounds that can inhibit the germination of small seeds.
Allow three to four weeks before sowing carrots or lettuce. Young plants such as tomatoes or squash can usually go in a little earlier.
Winter Vetch: Save It for Next Year
Mixing winter vetch into the rye would give the soil extra nitrogen, because as a legume it fixes nitrogen with the help of root nodule bacteria. It should be sown by mid-October at the latest, so this year it’s too late.
Keep the mix in mind for next autumn. Vetch is a legume, so on beds destined for peas or beans the following spring, plain rye is the better choice.
Plan Instead of Improvising
Write down which beds will be covered over winter and which get planted first in spring. In Rootivo’s bed editor you can plan your beds for next year ahead of time and keep your crop rotation in view.