Gadenin日本語Get the appThe shape of the season
Rice takes roughly four to five months in the ground and demands warmth for all of it. Count backwards from your first autumn frost: the crop needs to be cut and under cover before then, and the grain needs about four weeks of warm weather after flowering to fill and harden. In a cool temperate summer that is a tight fit, and being two weeks late in spring is the usual reason a home tub ends the year with heads full of nothing.
There are three stages and two hard deadlines. The stages are the nursery tray, the flooded growing season, and the dry post-harvest work of threshing and hulling. The deadlines are getting the seedlings transplanted while there is a full summer ahead of them, and getting the crop netted before the grain colors.
Stage by stage
The table below is written in conditions rather than dates so it reads the same in either hemisphere. The trigger column is what you actually watch for; the duration column tells you whether you are on schedule.
| Stage | Trigger | Duration | Main job |
|---|---|---|---|
| Soaking | Six weeks before your last frost | 2 to 7 days | Soak paddy seed at room temperature until husks split. Discard floaters. |
| Nursery tray | As soon as husks split | 3 to 5 weeks | Warm, bright, soil kept saturated but not flooded. Thin to an inch (2.5 cm) apart. |
| Transplanting | Seedlings at 3 to 4 leaves, nights reliably above 59F (15C) | 1 day | Puddle the mud, set clumps of two or three, hold water at 1 inch (2.5 cm). |
| Establishment | New upright growth appears | 1 to 2 weeks | Raise water to 2 to 4 inches (5 to 10 cm). Watch for snails taking transplants. |
| Tillering | Side shoots appear at the clump base | 4 to 6 weeks | Hold water steady. Feed lightly at the end. Weed anything the flood missed. |
| Midsummer dry-down | About 20 stems per clump, surface closed over | About 1 week | Let the water go until the mud firms and hairline cracks show. Then reflood. |
| Heading and flowering | Heads push out of the stem sheaths | 2 to 3 weeks | Deepest water of the season, 3 to 4 inches (8 to 10 cm). Never let it dry now. |
| Grain fill and ripening | Grain milky, then doughy, then hard | 4 to 6 weeks | Net against birds as soon as color changes. Shallow water, then drain. |
| Harvest | Four grains in five hard and golden, heads bent over | 1 day | Cut at the base, bundle, hang heads-down under cover. |
| Drying | Immediately after cutting | 2 to 3 weeks | Dry and airy. A grain should shatter crisply between the teeth. |
| Threshing and hulling | Once dry | 1 to 2 evenings | Beat off the grain, winnow, then hull. Allow real time for hulling. |
The decisions the season turns on
Most of the season is watching. A handful of moments actually change the outcome, and all of them are judgement calls made by looking at the plant rather than at a date.
- Starting the seed early enough Everything downstream inherits this. If you are late, heading is late, grain fill runs into cold weather, and the heads never harden. Six weeks before last frost is the target; a heat mat under the tray buys back a week.
- Not transplanting into cold mud Seedlings put into water below about 59F (15C) sit and sulk for a fortnight, which cancels out any earliness you gained. Wait for settled warmth even if the seedlings look ready.
- Committing to the midsummer dry-down It looks like you are killing the crop and it is the single most valuable thing you do. It stops useless late stems, airs sour mud and anchors the plants against storms.
- Netting before the grain colors Not when you see birds. The moment the green starts leaving the heads, the net goes on.
- Cutting slightly early Under-ripe grain finishes on the drying rack. Over-ripe grain shatters onto the mud and is lost. When four in five grains are hard, cut.
If heading has not happened by about eight weeks before your first expected frost, the crop will not fill properly. Accept it, cut what you have for the straw and the experience, and start two to three weeks earlier next year.
Closing the loop for next year
When the tub is cut, the season is not quite over. Save unhulled grain from the clumps that headed earliest and stood straightest, and keep it dry, cool and labeled with the year. Home-saved rice seed is reliable for one season and marginal by the third, so save fresh every year and use the oldest first.
Empty the tub or leave it as a small water feature over the cold months, but do not leave wet spent straw sitting in it, which sours the mud and harbors stem borers. The mud itself can be reused indefinitely: turn it over, let it freeze or dry through the cold season, and re-puddle it in spring.
Finally, write the season up in four lines while it is fresh: the date you soaked, the date you transplanted, the date the first head emerged and the weight you harvested. Rice is a crop where the same tub in the same spot behaves consistently from year to year, so those four numbers are genuinely predictive. After two seasons you will know exactly how early to start, and after three you will know what your tub is capable of, which is the only yield figure that matters.