Gadenin日本語Get the appWhy there is no fully ripe moment
Buckwheat flowers indeterminately. It keeps producing new flowers on new side shoots for four to six weeks while the earliest seed is already hardening below them, so at any moment the plant carries open white flowers, soft green seed and hard brown seed all at the same time. There is no day on which the crop is uniformly ripe, and waiting for one guarantees a loss.
That is because ripe seed shatters. Once an achene has turned dark brown and hard, it detaches at the slightest knock and falls to the soil. If you wait for the last flowers to set and ripen, the first seed formed, which is also the largest and best filled, has already been on the ground for a fortnight. The arithmetic always favors cutting early.
The working rule is to cut when roughly three quarters of the seed on the plant has turned brown. At that point the lower and middle seed is fully ripe, the upper seed is mature enough to finish ripening on the cut plant, and shattering losses are still small. There will still be flowers on top. Cut anyway. A crop taken at three quarters brown and finished under cover reliably beats a crop left standing until it looks finished.
| Sign | What you see | What it means |
|---|---|---|
| Lower seed brown, upper still green | A gradient of color up each stem | Normal. Keep checking every two days |
| About three quarters of seed brown | Most seed dark, some green, flowers still on top | Cut now. This is the window |
| Loose seed on the soil under the stand | Dark triangular seed on bare ground | Shattering has begun and you are losing the best seed |
| Leaves yellowing and dropping | Bare stems below, thinning canopy | The plant is finishing. Harvest is within days |
| Birds working the block persistently | Finches and sparrows on the stand | The seed is ripe and worth taking now |
| Frost forecast | Any night near 30F (minus 1C) | Cut immediately, ripe or not. Frost kills the plant outright |
Cut in the morning while dew is still on the plants. Damp seed heads shatter far less as you handle them, and the whole stand can be moved with a fraction of the losses you would take cutting in dry afternoon heat.
Cutting and moving the crop without losing seed
Almost all the seed a home grower loses is lost between the bed and the drying place, not in the field. The stems are hollow and brittle, the seed is loose on the plant, and every armful carried loosely across a garden leaves a trail. Spreading a sheet before you start and handling the crop slowly is worth more than any refinement of timing.
Cut the stems near the base with a sickle, shears or a sharp knife. Take a handful at a time, keep it upright rather than swinging it, and lay it straight onto the sheet with all the cut ends together. Aligned stems are much easier to tie into bundles and much easier to thresh later than a jumbled heap. When the block is cleared, gather the sheet by its corners so any seed that has already shattered comes with the crop, and expect a noticeable amount of it.
Get everything under cover the same day. A cut buckwheat crop rained on is a real setback: the seed absorbs moisture quickly, the heads mold in the middle of a bundle, and the drying stage that should take a week stretches to three. This is the whole reason the harvest is finished indoors rather than left to dry in the bed.
- Spread a sheet or tarpaulin beside the block first Everything cut goes straight onto it. The seed that shakes loose during cutting is a meaningful share of a home crop and it is only recoverable if it lands on something you can gather.
- Cut low, a handful at a time Sickle or shears at three to four inches (8 to 10 cm) above the ground. Grip the handful first, cut second, and lift it steadily without shaking. Leave the stubble and roots in the bed.
- Lay the stems parallel with the cut ends aligned This costs nothing at the time and saves a lot of trouble later. Aligned stems tie into neat bundles and feed into a threshing sack without tangling.
- Tie loose bundles of a manageable size Bundles about four inches (10 cm) thick at the tie, fastened at the cut ends with string. Loose is important. A tight bundle holds moisture in its core and the seed inside molds rather than dries.
- Move under cover the same day, seed heads down Shed, garage, porch or greenhouse, hung upside down over a sheet or laid in a single layer on a rack. Hanging heads down means shattered seed falls onto the sheet rather than staying in the bundle.
What a home block actually yields, and the greens
It is worth being honest about scale before you commit ground to a seed crop. A well-grown home block yields somewhere around three to six ounces of seed per square yard (100 to 200 g per square meter) in a good season, and that is unhulled seed. The hull is a hard, tough, triangular shell that makes up roughly twenty percent of the weight and is genuinely difficult to remove at home, which is the part most people do not anticipate. A small block gives you a jar, not a sack of flour.
That is not an argument against growing it for seed, but it does mean the seed crop makes most sense as a way of producing next year's sowing seed for free, with the eating as a bonus. Buckwheat sets seed that comes reasonably true in a home garden, and a single square yard easily produces enough to sow twenty times that area the following season.
The young leaves and shoots are edible as a green, picked when the plant is under a foot (30 cm) tall, and the flowering tops are used as a leafy vegetable in several cuisines. Use them in modest quantity. Buckwheat foliage contains fagopyrin, which can cause photosensitivity in sensitive people who eat large amounts and then spend time in strong sun. As an occasional handful in a stir fry it is not a concern; as a daily bulk green it is.
What to record at harvest
Write down the cutting date against the sowing date. That interval is the real length of the crop where you garden, and it is the number you will use to decide next year whether a seed crop fits between your last frost and your first, or whether you should be growing buckwheat purely as a cover crop.
Weigh the cleaned seed and record it against the area you cut. Note how much shattering you saw before you cut, because loose seed on the soil means you were late and should cut nearer two thirds brown next season. Note the weather during flowering too, particularly any run above 90F (32C), since a poor seed yield after a hot flowering period is a weather problem rather than a technique problem and calls for a different sowing date rather than more effort.