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Pepper (sweet & chili)

Capsicum annuum

VegetableContainer-friendlySummer Medium

Sweet bells or fiery chilies — peppers love heat and patience. They self-pollinate, drop blossoms in extreme heat, and (unlike tomatoes) want to be planted at the same depth they grew in the pot.

Growing conditions

Light
Full sun — at least 6–8 hours of direct sun a day
Water
Medium
Soil
Fertile, well-drained loam rich in organic matter; warm soil is essential · pH 6.0–6.8 (slightly acidic; extension guidance ranges from 6.0 to 7.0)
When to sow
Sow indoors about 8 weeks before your last spring frost (10–12 weeks for slow hot types like habanero or Carolina Reaper). Transplant outdoors 1–3 weeks AFTER the last frost, once nights stay above 12–13°C (55°F) — peppers stall in cold soil.
Spacing
38–46 cm (15–18 in) between plants, rows 76–91 cm (30–36 in) apart
Days to maturity
60–90+ days from transplant to first green-ripe fruit (most sweet and hot types 70–85). Add another 2–3 weeks if you want fully colored red, yellow, or orange fruit. Counting from seed it is closer to 100–120 days — a key reason peppers are almost always transplanted, not direct-sown.
Hardiness
Grown as a summer annual in USDA zones 3–11; needs a frost-free stretch of roughly 65–100+ warm days, so cooler zones (3–6) should start with transplants and may use black plastic mulch or row cover. Truly perennial only in frost-free zones 9b–11.

How to grow it

  1. 1

    Germinate warm and give strong light

    Sow seed 0.6 cm (1/4 in) deep in moist seed-starting mix and keep it at 24–29°C (75–85°F) to well — peppers are slow and uneven in cold mix. Once sprouted, give 14–16 hours of bright grow-light so seedlings stay stocky rather than leggy.

  2. 2

    Harden off before transplanting

    About a week before they go outside, off the seedlings: set them in a sheltered spot for a couple of hours, then add more sun and outdoor time each day so they adjust to wind and brighter light. Skipping this step shocks the plants and stalls growth.

  3. 3

    Transplant into warm soil and feed lightly

    only after the frost danger has passed and soil is at least 18°C (65°F), spacing plants 38–46 cm (15–18 in) apart. Mix some into each hole. Peppers are moderate feeders — too much nitrogen makes lush leaves and few fruit, so modestly and side-dress once fruit starts to set.

  4. 4

    Mulch and water deeply and evenly

    around plants — black plastic early to warm the soil, or straw later to hold moisture — then deep water to keep the soil evenly moist, roughly 2.5 cm (1 in) per week. Steady moisture is the single best defense against blossom-end rot and bitter, undersized fruit.

  5. 5

    Support, and let them self-pollinate

    Pepper flowers are 'perfect' and self-, so you don't need bees — but a gentle daily shake or a light breeze helps the pollen drop and improves fruit set. or cage heavy-bearing or tall plants so branches, which are brittle, don't snap under a load of fruit.

  6. 6

    Manage summer heat

    In a heat wave, flowers may drop and stop setting when days top about 32°C (90°F) or nights stay above 24°C (75°F) — this is normal and temporary. Keep plants watered and ; fruit set resumes when temperatures ease. In the hot South, light afternoon shade and a of low groundcover can buffer the heat.

Gardener's notes

  • Peppers self-, so a single plant will fruit alone — but a gentle daily shake or a breeze improves how much fruit sets.
  • off the first few flower buds on young ; sacrificing that early fruit lets the plant grow bigger and yield more overall.
  • Chili heat is partly environmental: heat-stressed, slightly drier plants often produce hotter pods than pampered, heavily watered ones.

Varieties worth knowing

California Wonder (sweet bell, OP)
Classic blocky green-to-red bell, ~70–75 days from transplant; reliable home-garden standard.
Ace (F1 sweet bell)
Early, very productive bell that sets fruit even in cooler weather — a good pick for short-season northern zones.
Carmen (F1 sweet, Corno di Toro type)
Sweet tapered 'bull's horn' pepper, ripens red around 75–80 days; sweeter and earlier than many bells.
Early Jalapeño (chili, OP)
Dependable medium-heat jalapeño, ~65–70 days; quick enough for short seasons.
Poblano / Ancho (chili, OP)
Mild, meaty chili used fresh as poblano and dried as ancho; ~65–80 days.
Habanero (chili, OP)
Very hot, heat-loving type needing a long warm season (90+ days) — best in zones 7+ or started extra early.

Common problems & fixes

Blossom-end rot
Sign: Sunken, leathery brown-black patch at the blossom (bottom) end of the fruit.
Fix: Despite the look, this is almost never a lack of calcium in the soil — it's a calcium-uptake problem caused by uneven watering, drought, or root stress. Water deeply and consistently, mulch to steady soil moisture, and avoid heavy nitrogen. Adding calcium to soil that already has it rarely helps.
Sunscald
Sign: Pale, papery, blistered patch on the sun-facing top/shoulder of the fruit, which may later rot.
Fix: Caused by intense sun on exposed fruit, often after leaves are lost to disease or over-pruning. Keep foliage healthy so it shades the fruit; don't over-prune. Distinguish from blossom-end rot, which is at the bottom end, not the sunny side.
Blossom drop in heat or cold
Sign: Flowers fall off without setting fruit during temperature extremes.
Fix: Fruit fails to set when days exceed ~32°C (90°F) or nights fall below ~13°C (55°F). Mostly wait it out — keep plants watered and mulched, and set transplants out at the right time so the main fruiting window lands in moderate weather.
Aphids
Sign: Clusters of small soft insects on new growth and leaf undersides; sticky honeydew, curled leaves, sooty mold.
Fix: Knock them off with a strong spray of water, encourage ladybugs and lacewings, and use insecticidal soap if needed. Avoid excess nitrogen, which fuels the tender growth aphids love.

Companions

Grows well with
BasilOnions and chivesCarrotsMarigoldsSpinach or lettuce (low groundcover/living mulch)
Keep apart from
FennelBeans (some report competition)Other nightshades like tomatoes and eggplant nearby (shared pests and diseases)

Harvest & storage

Harvest
Harvest with hand pruners (snip, don't pull — stems are brittle) once fruit reaches full size and the firmness you want. You can pick sweet peppers green, but leaving them to ripen to red, yellow, or orange makes them sweeter and richer in vitamins — it just takes 2–3 weeks longer and slows new fruit set. Pick chilies at the color and heat stage you prefer; frequent picking keeps plants producing.
Storage
Store fresh peppers unwashed in the crisper for 1–2 weeks. They freeze well chopped without blanching. Chilies cure and store long-term when dried — string and air-dry, dehydrate, or smoke them; fully dried pods keep for months.

Sources

This guide is curated from authoritative horticulture references — primarily US university Extension services, the USDA, and the RHS.