Pepper Capsicum annuum

Reviewed June 2026 · how we check this

The sun-loving heart of the summer garden — a frost-tender annual grown for sweet bells, crisp frying types, and fiery chiles on tidy, upright plants. A little slow to start from seed, but generous and low-fuss once warm weather settles in and the roots take hold.

Light

Peppers are unapologetic sun-lovers — give them at least 6 hours of direct sun, and 8 or more for the heaviest set of thick-walled fruit. Too little light and you'll get tall, weak, dark-green plants that flower sparsely and ripen painfully slowly. Choose the warmest, brightest, most sheltered corner of the garden, away from the shade of fences or taller crops. In scorching, intense-sun regions a little afternoon shade during a heat wave can spare bell fruit from sunscald, but for most gardeners full exposure is exactly right. Indoor seedlings need a grow light held just a few inches above them, run 14–16 hours a day, to grow stocky instead of leggy.

Watering

Peppers want deep, even moisture — roughly 1–2 inches of water per week, more in heat. Water deeply at the base 2–3 times a week rather than a daily sprinkle; this draws roots downward and builds resilience. Keep the foliage dry and water in the morning to discourage fungal disease. Consistency is everything: erratic wet-then-dry swings trigger blossom-end rot and can cause flowers to drop. A 2–3 inch mulch of straw or shredded leaves steadies soil moisture and temperature. Containers dry out quickly and may need water daily in peak summer. A slight, deliberate dry-down can nudge hot peppers toward greater pungency near harvest.

Soil & potting

Plant in rich, well-drained loam worked generously with compost or aged manure, aiming for a slightly acidic pH of 6.2–6.8. Peppers are moderate-to-heavy feeders, so dig several inches of organic matter into the bed before planting. Unlike tomatoes, do not bury the stem deeply — set transplants at the same depth they grew in their pots, since pepper stems don't readily root along their length. A raised bed warms early and drains freely, which peppers love after a cool spring. In containers, use at least a 3–5 gallon pot with quality mix and reliable drainage. Avoid beds where peppers, tomatoes, or potatoes grew the previous year.

Humidity & temperature

Peppers are heat-loving annuals killed by frost, so warm soil and warm nights are non-negotiable. They set fruit best between 70–85°F; below 55°F growth stalls and blossoms drop, and sustained days above 90°F (or nights above 75°F) also cause flowers to abort without setting. Wait to transplant until soil reaches at least 60–65°F and nights stay reliably above 55°F — peppers resent cold feet far more than tomatoes do. In humid regions, space plants for airflow to limit leaf spot and rot. Protect young transplants from late cold snaps with frost cloth, and use a cover to stretch the harvest past the first light frost in fall.

Fertilizing

Peppers like steady, moderate feeding. Mix a balanced fertilizer into the planting hole, then switch to lighter, regular feeding once the first flowers appear. A liquid vegetable fertilizer every 2–3 weeks supports a long, productive season. Go easy on nitrogen — too much grows a big leafy bush with few peppers. A boost of phosphorus and potassium once fruit begins to set encourages thicker walls and better ripening. Calcium-rich amendments paired with even watering help prevent blossom-end rot. Container plants run through nutrients quickly and do best with lighter, more frequent feedings rather than occasional heavy ones.

Pruning & maintenance

Peppers need little pruning, but a few touches help. Pinch off the very first flowers on young transplants so the plant builds roots and foliage before fruiting — you'll get a heavier overall crop. Tall sweet and chile types can flop under a load of fruit, so stake or cage them and remove any leaves touching the soil to reduce disease splash. Harvest is its own pruning: pick sweet peppers green for productivity or leave them to ripen red, orange, or yellow for sweeter flavor; harvest hot peppers at full color for peak heat. Cut fruit off with snips rather than tugging, which can snap brittle branches.

Propagation

Peppers are grown from seed, started indoors about 8 weeks before your last spring frost — earlier than tomatoes, since they germinate and grow slowly. Sow seeds 1/4 inch deep in moist seed-starting mix and keep them warm: a heat mat holding 80–85°F speeds germination from a sluggish 2–3 weeks to under 10 days. Grow seedlings under bright light to keep them compact, and pot up once true leaves appear. Harden off over a week of increasing outdoor exposure, then transplant only after frost has passed and nights stay above 55°F. Save seed from open-pollinated (not hybrid) fruit, and keep hot and sweet types apart to avoid cross-pollination.

Common problems

Blossom-end rotSunken brown leathery patch on the fruit's bottom — a calcium and watering issue, not a disease.→Flowers drop without setting fruitUsually temperature stress, too much nitrogen, or poor pollination.→

Through the year

Spring

Start seeds indoors ~8 weeks before last frost; harden off and transplant only once frost danger passes, soil hits 60–65°F, and nights stay above 55°F.

Summer

Peak growth and harvest — water deeply and evenly, feed every 2–3 weeks, stake heavy-bearing plants, and pick often to keep production going.

Fall

As nights cool, stop feeding and let remaining fruit color up; cover with frost cloth to ripen the last peppers ahead of the first frost.

Winter

Out of season in most zones — plan next year's varieties, refresh beds with compost, and order seed early for the long start indoors.

Companion planting

Classic companions: basil, onions, carrots, marigold, and nasturtium; keep away from fennel and avoid following tomatoes or potatoes.

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