Gadenin日本語Get the appSow by soil temperature, not by the calendar
Okra is the least forgiving of the common summer vegetables about cold soil. The seed coat is hard, the seed sits in the ground for days before it moves, and in cool wet soil it is far more likely to rot than to sprout. Waiting two weeks longer than you want to costs you nothing and saves you resowing.
Measure the soil at two inches (5 cm) deep in the morning, not in the afternoon when the surface has warmed. Once that morning reading holds above 65F (18C) for three days running, you can sow. Above 75F (24C) the seed comes up in four or five days and grows away immediately.
| Morning soil temperature | Days to emerge | What to expect |
|---|---|---|
| Below 60F (16C) | No reliable emergence | Most seed rots. Do not sow |
| 60 to 65F (16 to 18C) | 14 to 21 | Thin, uneven stand |
| 65 to 70F (18 to 21C) | 8 to 12 | Acceptable, sow a little thicker |
| 70 to 85F (21 to 29C) | 4 to 7 | Even, vigorous stand |
| Above 90F (32C) | 3 to 5 | Fast, but the surface dries out quickly |
If you have no soil thermometer, use the ground itself. Okra wants soil that is comfortably warm to a bare hand pushed in to the knuckles, which is well past the point at which beans are happy.
Soak or nick the seed first
The seed coat is thick and waterproof, and that is the single biggest reason for a patchy okra row. Breaking that barrier before the seed goes into the ground cuts several days off emergence and evens the row out, which matters more than it sounds because a seedling that comes up a week late never catches up.
Use one of the two methods below, not both. Nicked seed that is then soaked overnight takes up water too fast and the seedling can be damaged.
- Overnight soak Cover the seed with water at room temperature and leave it 12 to 24 hours. Do not go beyond 24 hours, because the seed starts to ferment and germination drops. Drain, spread on a cloth for ten minutes so the seed is damp rather than wet, and sow the same morning.
- Nicking Rub each seed once or twice on medium sandpaper, or take a shallow cut with a knife at the end away from the pale scar. You are scratching the coat, not opening the seed. Sow nicked seed dry, straight into moist ground.
- Sow into moisture, not onto it Water the drill or the station the day before and let it drain. Soaked seed dropped onto dry soil and then watered in from above is the one combination that reliably fails, because the surface caps and the seedling cannot push through.
Depth, station spacing and how many seeds
Okra roots deeply and the seed has enough reserve to come up from a proper depth, so shallow sowing is a mistake here. Half an inch (1 cm) dries out and kills the seed on a hot week; three quarters of an inch to an inch (2 to 2.5 cm) sits in moisture that lasts.
Sow in stations rather than a continuous drill. Okra is thinned down to one strong plant per station anyway, and stations make the thinning obvious and let you replace a failed spot without disturbing the row.
| Item | Open ground | Container |
|---|---|---|
| Sowing depth | 0.75 to 1 in (2 to 2.5 cm) | 0.75 in (2 cm) |
| Seeds per station | 4 to 5 | 3 |
| Station spacing | 15 to 18 in (40 to 45 cm) | One station per pot |
| Row spacing | 30 to 36 in (75 to 90 cm) | Pot at least 12 in (30 cm) wide and deep |
| Final plants per station | 1 | 1 |
Direct sowing beats transplanting
Okra puts down a deep taproot early and resents having it broken. A direct sown plant will overtake a transplanted one of the same age within a month, and it will stand drought far better in high summer because the root has never been checked.
If your season is genuinely too short to direct sow, start in deep individual cells or paper pots three weeks before planting out and no earlier, and set the plants out before the roots reach the bottom of the cell. Never let an okra seedling sit rootbound; a plant that has circled in a small cell stays stunted for the rest of the year.
Do not sow a second batch two weeks after the first the way you would with beans. One well timed sowing of okra crops from midsummer until frost, and a later sowing simply produces a smaller plant that starts cropping when the first one is already at full output.
The first two weeks after sowing
Keep the top inch (2.5 cm) of soil damp until the seedlings are through, then stop watering little and often straight away. Once the first true leaf shows, water less frequently and more deeply so the root chases moisture downwards, which is exactly what you want from a crop that has to stand full summer heat.
Expect gaps. Even from good seed in warm soil, four seeds per station typically give three seedlings, and that is why you sow four. Fill an empty station by resowing within the first ten days, not by moving a seedling across from a crowded one.
What to note down at sowing
Sowing is the point where a few lines of record pay off most, because everything you decide next year depends on numbers you cannot reconstruct later. Write down the morning soil temperature on the day you sowed, whether you soaked or nicked, and the date the first seedling broke the surface.
Add a rough sketch of which station is where in the row. When one plant later turns out to crop twice as long as its neighbors, or one corner of the bed wilts first every afternoon, that sketch is what turns a vague impression into something you can act on next season.