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Rye goes into the ground in autumn and everything up to early spring is identical whether you intend to eat the grain or turn the crop in. The paths separate at stem extension. A cover crop is cut down at twelve to eighteen inches (30 to 45 cm) before any ear appears, freeing the bed by mid spring. A grain crop is left to run up to four or five feet (1.2 to 1.5 m), flower, fill and ripen, and occupies the bed until early summer.
The table below is written in seasons rather than dates, because the same crop shifts by weeks between one garden and the next and reverses entirely between hemispheres. What travels is the intervals: the gap between emergence and tillering, between heading and hard dough, between cutting and a bed you can sow into. Once you have a season of your own recorded, replace these with your own dates and the calendar becomes genuinely useful.
The planning headline is how long the ground is committed. A rye cover crop returns the bed in mid spring, in time for almost anything. A rye grain crop holds the bed for eight or nine months and hands it back in early summer, which suits a following crop of bush beans, late brassicas or a fast green manure but not a full season crop. Decide which you are doing before you sow, because the seeding rate differs.
| Stage | As a cover crop | As a grain crop |
|---|---|---|
| Sowing | Autumn, as late as the ground stays workable | Autumn, ideally six weeks before hard freeze |
| Seeding rate | About 2.5 to 3 oz per square yard (85 to 100 g per square meter) | About 1.5 oz per square yard (50 g per square meter) |
| Emergence | Five to fourteen days depending on soil warmth | Five to fourteen days depending on soil warmth |
| Tillering | Late autumn, then paused through the cold | Late autumn, then paused through the cold |
| Winter | A green mat holding the soil and taking up nitrogen | A low mat of three to five tillers, dormant |
| Early spring | Fast regrowth; the clock starts | Growth restarts; last chance to feed |
| Stem extension | Cut now, at 12 to 18 in (30 to 45 cm) | Support goes in; feeding stops |
| Heading and flowering | Should never reach this stage | Late spring; wind pollination over about a week |
| Grain fill | Not applicable | Three to four weeks after heading |
| Harvest | Not applicable | Early summer, cut at hard dough |
| Bed available again | Mid spring, plus three weeks for fine seed | Early summer, plus three weeks for fine seed |
The four decisions that close
Most of a rye season is watching a crop that does not need you. Four moments are different, and each one shuts: act late and the option is gone for the year. Everything else can wait a fortnight without consequence, which is what makes rye a forgiving crop to fit around a busy garden.
- Sow while the ground is still workable Aim for six weeks of growth before hard freeze so the crop makes three or four tillers. Rye will germinate down to about 34F (1C), so a late sowing still beats leaving the bed bare, but earlier is stronger.
- Feed, if at all, before stem extension One light dressing in early spring on poor ground, and no more. Run a stem between finger and thumb: once you can feel the hard node traveling up inside the sheath, ear number is fixed and further nitrogen only builds height that will lodge.
- For a cover crop, cut before any ear shows Twelve to eighteen inches (30 to 45 cm) and still soft and green. After heading the stems go woody, take months to break down, and are hard work to dig in. This is the window most often missed.
- For grain, put support up during stem extension Two tiers of string on canes, at knee and hip height, laid on while the crop is still short enough to work over the top of. A week later you are threading string through standing stems and flattening them as you go.
- Cut grain at hard dough, testing daily Once the ears bend over, thumbnail a kernel from the middle of an ear each day. Cut on the day it dents and holds but no longer squashes. Waiting for glassy grain costs whole ears to shattering.
Between flowering and hard dough there is a stretch of three to four weeks where the right action is nothing at all beyond walking the block after storms and keeping netting over the ears. Resist watering, feeding and tidying; that is the period in which a rye crop is most easily spoiled by attention.
What follows rye, and when the bed is really free
The bed is not available the day you clear the crop. Rye residue suppresses the germination of small seeds as it breaks down, so allow about three weeks between turning it in and direct sowing carrots, lettuce, brassicas, onions or any fine seed. Large seed and transplants are the exception and can go in straight away, which is why the standard sequence after a rye cover crop is squash, beans, corn or a tray of brassica transplants rather than a direct sowing.
After a grain crop cut in early summer there is still useful time. Bush beans, late brassicas or a fast green manure all fit into the remainder of the year. Do not follow rye with rye, or with any cereal, on the same ground. Rusts and other foliar diseases carry over on straw, stubble and volunteer seedlings, and a second consecutive crop reliably comes off worse than the first. Leave two seasons before cereals return, and a legume in between supplies the modest nitrogen the next cereal wants.
Rye straw is long, tough and slow to rot, which makes it excellent mulch and poor compost material unless it is chopped and mixed with plenty of green matter. Keep it for paths, for mulching around fruit, or for bedding. If a crop had visible rust, keep that straw out of the compost pile and off the beds entirely.
Building a calendar of your own
Record five dates each year and after two seasons you will have a calendar worth more than any published table: the day you sowed, the day the first green showed, the day growth restarted in spring, the day you cut or terminated, and the day you sowed the next crop into that bed. Add the weight of clean grain and the area it came from if you took it through to harvest, so that a good year and a bad year can be compared rather than remembered.
Alongside the dates, note three conditions. How far the crop had got by the time the ground froze, since that judges your sowing date better than anything else. What the weather did during the week the crop flowered, since a cool wet spell there is what invites ergot. And how well the following crop germinated, which tells you whether three weeks is the right interval in your own soil or whether it needs four. Sketch the block outline too, because in early spring a bed of rye and a bed of vigorous grass weed look much alike from the path.