Gadenin日本語Get the appWait for the soil, not for the calendar
The most expensive mistake with this crop is planting too early. A pepper set into ground below about 60F (16C) does not simply grow slowly and catch up. It checks, hardens, sits with purple-tinged leaves for weeks, and produces a small permanently stunted plant that crops poorly even after the weather comes right.
The plant that went out two or three weeks later into warm ground overtakes it within a month and out-yields it all season. Push a soil thermometer four inches (10 cm) down in the morning and wait for three consecutive mornings above 60F (16C), with night air staying above 55F (13C). That is the signal, and it is usually two to three weeks after your last frost.
| Soil at 4 in (10 cm) | What the plant does | Verdict |
|---|---|---|
| Below 55F (13C) | Stops, leaves purple, roots do not extend | Do not plant |
| 55 to 60F (13 to 16C) | Survives but checks badly | Wait, or warm the bed under plastic |
| 60 to 65F (16 to 18C) | Roots away steadily | Acceptable, and the usual real-world window |
| Above 65F (18C) | Roots away fast, no check at all | Ideal |
| Above 75F (24C) | Fast, but the plant dries quickly | Fine; shade and water for the first week |
Black plastic or a cloche laid over the bed for a fortnight beforehand lifts soil temperature by 5 to 8F (3 to 4C) and can genuinely buy you two weeks in a cool spring.
Choosing the plant to put in
The plant you want is short, thick-stemmed, dark green and slightly wider than it is tall, with the leaves close together up the stem. A tall thin one with big gaps between the leaves has been grown in weak light, and it will flop under a crop it does not have the wood to carry.
Ignore the one with pods already on it, even though it looks like the best value on the bench. That pod is why it looks impressive and it is also why the plant has stopped extending. If you buy one anyway, take the pod and any open flowers off on planting day.
| What you see | What it tells you | Buy it? |
|---|---|---|
| Short, stocky, dark green, close leaf joints | Grown in good light, well hardened | Yes |
| Tall and thin with long gaps between leaves | Grown too warm in poor light | No, or bury deeper and stake immediately |
| Already carrying pods or open flowers | Has stopped extending to fill them | Only if you strip them on planting day |
| Roots circling tightly in the pot | Rootbound; will crop late all season | Avoid; if you must, tease the roots loose |
| Purple stems and leaf undersides | Has been cold; may or may not recover | No, if you have any alternative |
Preparing the ground and spacing a bushy plant
This type builds a much wider, twiggier bush than a blocky pepper, and it needs the air. Plants crammed at 12 inches (30 cm) grow into one dense mass that stays wet after rain, hides aphids, and makes picking miserable, which then leads directly to pods being left on and the plant stalling.
Space them 18 to 24 inches (45 to 60 cm) apart with 24 to 30 inches (60 to 75 cm) between rows. Fork in two inches (5 cm) of compost across the whole bed rather than putting rich material in the hole, and do not add high nitrogen fertilizer now. Aim for a pH of 6.0 to 6.8.
| Setting | Spacing | Notes |
|---|---|---|
| Open ground row | 18 to 24 in (45 to 60 cm) | 24 to 30 in (60 to 75 cm) between rows |
| Raised bed | 18 in (45 cm) each way | Tighter is workable if you thin inner branches |
| Large container | One plant per 5 gallons (20 L) | Two in one pot halves the crop from both |
| Against a warm wall | 20 in (50 cm) | Earlier crop; watch for drying out and mites |
Do not mulch on planting day. Mulch laid over cold soil keeps it cold. Wait two weeks until the ground has warmed through, then put down two inches (5 cm) kept an inch clear of the stem.
Planting day, step by step
The whole job takes a couple of minutes per plant, and two of the steps are the ones people skip and regret: the canes and the collar. Both are far easier now than later.
- Water the plant an hour beforehand A pot watered an hour before comes out as an intact rootball. A dry one crumbles and tears roots, and this crop is slow to forgive root damage.
- Plant at the same depth, or barely deeper Unlike tomatoes, peppers root poorly from a buried stem. Set the plant at the depth it was in the pot, or at most half an inch (1 cm) deeper if it is leggy.
- Put three canes in now Three three-foot (90 cm) canes in a triangle about six inches (15 cm) out from the stem. Doing this later drives them through the root system, and this brittle bushy plant genuinely needs all three.
- Fit a cutworm collar A ring of card or a cut plastic bottle pushed an inch (2.5 cm) into the soil around the stem. It costs nothing and it stops the overnight loss of a plant you raised for ten weeks.
- Water in slowly at the base Half a gallon (2 L) poured slowly so it soaks in rather than running off. This settles the soil against the roots, which matters more than the volume.
- Shade for two or three days if it is hot A propped board or a piece of shade cloth over the plant through the afternoon for the first few days stops the leaves scorching while the roots take hold.
The first month, and what to record
Water every two or three days for the first fortnight and do not feed at all. Feeding a plant that has not yet made roots produces soft leaves on a small root system, which is exactly the plant you do not want going into summer heat. From week three, rub off any shoots appearing on the main stem below the first fork, and take off the first flower that opens right in that fork.
Write down the date you planted out and the soil temperature you measured, which plant went where in the bed, and the date the first flower opened. Peppers repeat themselves year on year more predictably than most crops, and having last season's real soil temperature and real first-flower date in front of you settles the planting date argument far better than any general rule about weeks after frost.
If a cold snap arrives after planting, cover the plants at night with row cover and do not feed them. A checked pepper recovers from cold much better than it recovers from being pushed with fertilizer while it is cold.