Gadenin日本語Get the appThe head does not ripen all at once, and it will not wait
Proso millet carries its seed on a loose, open, drooping panicle rather than a tight spike, and the seeds on it ripen in sequence from the tip of each branch downwards. The spread from the first hard seed to the last is commonly two weeks and can be longer in a cool late summer. If you wait for the bottom of the head to finish, the top of the head has been ripe for a fortnight, and ripe proso does not stay attached.
Shattering is the defining problem of this crop. Once a seed is fully hard, the joint holding it to the branch dries and weakens, and wind, rain or the brush of a sleeve knocks it to the ground. A block left a week too long can drop a third of its yield onto the soil, where it will germinate next spring and remind you of the mistake for years. This is not a crop you can leave standing until a convenient weekend.
So the rule is to cut at about two thirds hard. Take a head between finger and thumb and roll it. When roughly two seeds in three are hard enough that a fingernail dents but does not split them, and the remaining third at the base of the head are still doughy, that is the moment. The doughy seeds are not wasted: they continue to draw down from the stem and finish while the cut crop cures. What you lose by cutting early is far less than what you lose by cutting late.
| Seed state when rolled | Share of head | What it means | Action |
|---|---|---|---|
| Milky, fluid when squeezed | Most of the head | Grain still filling | Too early; wait |
| Doughy, dents and stays dented | Half or more | Filling nearly complete | Check again in three days |
| Hard, fingernail dents but does not split | About two thirds | Peak harvest point | Cut now |
| Hard and shedding at a touch | Most of the head | Losses already underway | Cut immediately, handle gently |
| Head visibly thinned, seed on the soil | Any | Substantial yield already lost | Cut what remains and expect volunteers |
Cutting: whole stems, in the morning, into something that catches
Cut in the early morning while the dew is still on the crop. Damp heads hold their seed far better than dry ones, and the difference between cutting at dawn and cutting at noon on a hot day is easily measurable in what ends up on the ground. Use a sickle, a serrated knife or shears and cut whole stems at about six inches (15 cm) above the soil, low enough to give you a length to tie and hang.
Carry the cut stems head-first into a basket, tub or sheet rather than under your arm. Every time a head swings against your leg it sheds. Some gardeners hold a tub under the head as they cut and lower each stem straight in; with a small bed that is the least wasteful method there is. On a larger block, lay a sheet along the row and work over it, so anything that does shake loose is recovered rather than sown.
Do not strip seed off standing plants in the bed. It seems efficient and it is the surest way to scatter a season of volunteers across the plot. Everything after the cut belongs under cover.
- Test several heads across the block, not one Roll heads from the middle and both ends of the bed. Proso ripens unevenly across a block as well as within a head, and one convenient head at the edge is a poor sample. If the average is around two thirds hard, cut the whole thing rather than trying to harvest in stages.
- Cut at dawn, with a container under the head Work while the crop is damp with dew. Hold a tub or basket beneath the seed head, cut the stem six inches (15 cm) above the ground, and lower the head straight into the container. Never let a cut head swing free.
- Bundle loosely and tie Gather stems into bundles about the thickness of your wrist and tie them near the cut ends with twine. Loose bundles let air through; fat, tight bundles hold damp in the middle and go moldy, which ruins the grain and can spoil a whole bunch.
- Hang heads down, under cover, out of rain Hang the bundles head down in a dry, airy shed, porch or greenhouse with a sheet, tray or paper spread underneath to catch what falls. Anything that sheds during curing is caught rather than lost, and much of your cleanest grain will come off exactly this way.
- Cure for two to three weeks before threshing Leave the bundles hanging until the stems are straw-colored and brittle and the last doughy seeds at the base of each head have gone hard. Threshing before that leaves soft seed that will mold in storage no matter how well you clean it.
Threshing and cleaning a small crop
Once the bundles are properly dry, threshing proso is easy compared with most grains, because the seed is already inclined to come off. Hold a bundle head-down inside a large tub or a pillowcase and rub the heads between gloved hands, or beat the bundle against the inside of a clean bin. A short session gets most of the seed; a second pass a day later, after the remaining stems have dried a little further, gets nearly all of it.
Clean by winnowing. Pour the threshed material slowly from one container into another in a steady breeze or in front of a fan on low. Chaff and broken stem carry away and the round, heavy seed drops straight down. Repeat three or four times until what remains is almost all grain. Do this outdoors and downwind of the beds you care about.
Note that the harvested grain still wears a tight hull, and proso is not a crop you can dehull comfortably by hand in quantity. In a home garden most of it is grown for seed to sow again, for poultry and wild birds, or for the small amount you are willing to work at.
Drying down and storing
Grain going into storage must be genuinely dry. The practical test is to bite a seed: it should shatter cleanly and crisply rather than dent. If it dents, spread the grain in a shallow layer on trays somewhere warm and airy and stir it daily for a few days more. Sealing damp proso in a jar produces a moldy, musty mass that is fit for nothing, and the grain will feel deceptively dry to the hand long before it actually is.
Store dry grain in sealed glass or metal somewhere cool and dark. Small round seed is a favorite of pantry moths and grain weevils, and paper or cloth bags will not keep them out. Two or three days in a freezer before jarring kills any insect eggs that came in from the field.
Keep back the best-filled heads from the middle of the block as next year's seed and store them separately, threshed but labeled. Proso stays viable for several years, so one good seed harvest carries you through a season when the crop fails or you decide to skip it.
Sweep the shed floor and the ground under the drying bundles when you are finished. Spilled proso is exactly how a tidy garden acquires volunteer millet in beds you never sowed.
The harvest notes that pay for themselves
Record the date you cut, and next to it your judgement of how ripe the block actually was: too early, about right, or already shedding. Also record the number of days from sowing to cutting. After two or three seasons those numbers give you a reliable local figure for how long proso takes in your garden, which is the whole basis for deciding how late you can sow it as a second crop.
Weigh the cleaned grain and write the weight against the bed size. Yield tells you plainly whether the stand was too thick, whether the block lodged, and whether the year was dry at the wrong moment. Finally, mark on a sketch of the plot exactly where the block stood, because that is where the volunteers will come up next spring and knowing it in advance saves a lot of confused weeding.