Growing Bell Peppers and Hot Peppers: A Complete Guide for Home Gardeners
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Bell peppers (Capsicum annuum) are grown in two main forms — sweet peppers eaten as a vegetable, and hot peppers used as a seasoning. 
This complete guide walks through choosing varieties, understanding the bell pepper growth stages, sowing and transplanting, watering and feeding, managing pests and diseases, and harvesting and storing your crop. Whether you grow in the ground, in containers, or under cover, peppers reward warmth, patience and steady moisture.
Sweet vs. Hot Pepper Varieties
All garden peppers belong to the genus Capsicum in the nightshade family Solanaceae, the same family as tomatoes and eggplants. The split between "sweet" and "hot" comes down to capsaicin content. Sweet peppers are used for salads, sauces, stuffing, pickling and salting. Hot or chili peppers contain more than 0.2% capsaicin, giving them a sharply pungent flavor; they are used as a spice in canning, marinating and salting, and as an excellent seasoning fresh or dried.
Nutritional Value and Vitamin Content
Sweet peppers stand out for their vitamin C content, which exceeds that of citrus fruit, and they also deliver vitamins A, B and P along with natural sugars. A fully ripe red or yellow pepper is noticeably sweeter and higher in vitamins than the same fruit picked green, because nutrients and sugars accumulate as the fruit ripens on the plant. For the best nutritional return, let at least some of your crop colour up fully before picking.
Capsaicin and Pepper Heat Measurement
Capsaicin is the compound responsible for the burning sensation of hot peppers, and its concentration determines a pepper's heat. Heat is measured on the Scoville scale in Scoville Heat Units (SHU), a system devised by the pharmacist Wilbur L. Scoville. Sweet bell peppers register 0 SHU, while extreme cultivars climb into the millions:
- Bell pepper — 0 SHU (no perceptible heat)
- Shishito / Poblano — mild, a few hundred to ~2,000 SHU
- Jalapeño — roughly 2,500–8,000 SHU
- Serrano — around 10,000–25,000 SHU
- Habanero (Capsicum chinense) — about 100,000–350,000 SHU
- Carolina Reaper — over 1,000,000 SHU
Hot peppers are spread across several species: Capsicum annuum covers most jalapeños and serranos, Capsicum chinense includes habaneros and the Fatalii, while Capsicum frutescens, Capsicum baccatum (such as Aji Cristal) and Capsicum pubescens account for many regional chilies. When handling hot peppers, wear gloves and avoid touching your eyes — capsaicin clings to skin. Tolerance to capsaicin heat does build with repeated exposure, which is why regular chili eaters cope with dishes that overwhelm newcomers.
Popular Bell Pepper Varieties and Color Selection
Bell pepper varieties differ in fruit colour, size, days to maturity and skin thickness, so your choice shapes both flavour and harvest timing. Most peppers start green and ripen to red, yellow, orange, purple or near-black depending on cultivar. Reliable and widely grown sweet types include large blocky bells such as Redskin, Mohawk and the early-maturing The Big Early, along with thin-walled Italian frying types like Corno di Toro Rosso, Ausilio Thin Skin Italian and Topepo Rosso. Compact, colourful options such as Aurora, Bianca, Jolly Giallo and the small Golden Nugget suit pots and short seasons.
For hot peppers, popular cultivars include Jalapeño, Serrano, Poblano, Shishito, Cowhorn, New Mexico Big Jim, Mammoth and heirlooms preserved by organisations like the Seed Savers Exchange and its Heritage Farm — among them Grandma Kirksey and North Star. Small-fruited ornamental peppers are often grown as houseplants on a windowsill; this perennial form bears edible, fiery pods that also work as seasoning. The RHS Award of Garden Merit (AGM) is a useful shortlist when choosing proven performers in the UK.
Choosing Pepper Varieties for Different Growing Conditions
Match the variety to your climate and growing space rather than picking on looks alone. Gardeners in short, cool seasons — for example a USDA Zone 6a garden in the Mid-Atlantic region or much of the UK — should favour early varieties with low days-to-maturity and small to medium fruit, since large bells may not ripen before frost. Use these guidelines:
- Short or cool seasons: early, quick-maturing types; consider growing under cover.
- Containers and balconies: compact cultivars such as Golden Nugget, Aurora or ornamental chilies.
- Long, warm seasons: large blocky bells and slow super-hots like Habanero or Carolina Reaper.
- Reliable supply of seed and plants: buy from established suppliers — Bonnie Plants, Seed Savers Exchange or seed catalogues referenced by The Old Farmer's Almanac (Almanac.com).
Peppers cross-pollinate readily within the same species, so if you intend to save seed, keep different varieties of one species apart or expect mixed offspring next year. Cross-pollination does not affect this season's fruit, only the seed.
Bell Pepper Growth Stages Overview
A bell pepper's life cycle runs through four broad stages — germination, vegetative growth, flowering and fruiting, then ripening — and the whole journey from seed to ripe fruit typically takes 90 to 150 days depending on variety and warmth. Days to maturity is normally counted from transplanting to the garden, not from sowing, so add the indoor seedling period when planning your season.
Seed Germination Timeline
Pepper seeds germinate slowly and need warmth, sprouting best at a soil temperature of 24–29°C (75–85°F) and usually emerging within 7–14 days. Start seeds indoors 8–10 weeks before your last expected frost, using a sterile seed mix kept consistently moist. A heat mat speeds and evens germination; once seedlings appear, give them strong light — 14–16 hours under grow lights — to prevent weak, leggy growth. In our experience cool, damp compost is the most common reason pepper seed fails to come up.
Vegetative Growth Stage Management
During the vegetative stage the seedling builds leaves, stem and roots before it flowers, and steady warmth, light and feeding now set up the yield to come. Pot seedlings on into larger containers once they have two or three sets of true leaves so roots are never cramped. Keep daytime temperatures around 21–27°C (70–80°F), feed lightly with a balanced fertilizer, and pinch out the very first flower buds on young plants so energy goes into growth — this produces bushier plants and a heavier later harvest. Healthy plants should carry 8–10 true leaves and a sturdy stem before they go outside.
Fruiting Stage Development
Fruiting begins after flowering and pollination, when fertilised blossoms set into small green peppers that swell over several weeks. Pepper flowers are self-fertile, so a single plant can set fruit, but gentle airflow or hand pollination — tapping the open flowers or dabbing them with a small brush — improves fruit set indoors and in still greenhouses. Flowers and young fruit may drop if temperatures swing too hot (above ~32°C) or too cold (below ~13°C), if the plant is drought-stressed, or if nitrogen is excessive, so stable warmth and even moisture matter most at this stage.
Climate Zone Impact on Growth Timeline
Your climate zone dictates when you sow, transplant and harvest, and whether large-fruited varieties will ripen at all outdoors. Warm regions of Central and South America — peppers' native home — and southern Europe ripen fruit easily in the open, whereas cooler zones such as Zone 6a or northern parts of the UK often rely on protected cultivation. Resources like the USDA hardiness zone map and seasonal frost dates published by The Old Farmer's Almanac help pin your sowing and planting-out windows to local conditions.
Agrotechnics of Growing Peppers
The agronomy of growing peppers closely mirrors that of tomatoes: peppers can be raised from seed sown directly in the ground or, preferably, from transplants, and they share a bed happily with tomatoes and eggplants. Sowing technique is the same as for tomatoes, but pepper seed should go in 6–8 days later because it needs warmer soil. Throughout the season peppers need regular soil loosening, watering and feeding. Find more crop guides in our agronomy section.
Direct Sowing vs. Seedling Method
Direct sowing into the ground is possible but yields a later crop, so the seedling (transplant) method is generally preferred. Sow pepper seed directly only in long, warm-season areas where soil reliably warms; elsewhere, raising transplants indoors gains weeks of growing time and brings the harvest forward. For an early crop, sow into protected ground about a week after tomatoes and grow on as seedlings.
Growing Early Peppers Under Cover
Growing early peppers under cover lets cool-climate gardeners extend the season and ripen fruit that would otherwise fail outdoors. Sow seed for early peppers in protected ground a week after tomatoes, then move plants into a greenhouse, polytunnel, or under cloches and fleece. Temporary film covers protect young transplants from late cold snaps, and fleece is also valuable for frost protection at either end of the season. Under cover, watch for heat build-up on sunny days and ventilate to keep temperatures below the low 30s°C.
Transplanting Seedlings
Transplant pepper seedlings outdoors only once the danger of frost has passed and the soil has warmed, because peppers are frost-tender and stall in cold ground. Harden off plants first by setting them outside for gradually longer spells over 7–10 days to acclimatise them to sun and wind. A transplant raised for 50–55 days is planted in open ground in the first to second ten days of May; container-grown plants of 65–70 days can go out earlier under temporary film covers. Set them at the spacing below and water in well.
- Spacing in the row: 30–45 cm (12–18 in) between plants.
- Row spacing: 45–60 cm (18–24 in) between rows.
- Support: stake or cage taller, heavy-cropping varieties to stop branches snapping under fruit.
- Yield: expect roughly 5–10 fruit per plant, more from large vigorous cultivars.
Watering and Moisture Management
Peppers need consistent, even moisture — about 2.5 cm (1 in) of water per week — applied deeply at the base rather than as frequent shallow sprinklings. Irregular watering is the leading cause of dropped flowers and blossom end rot, so keep the soil evenly moist but never waterlogged. Water in the morning, direct it at the roots to keep foliage dry, and mulch around plants to conserve moisture, suppress weeds and steady soil temperature. In hot spells check containers daily, as pots dry out fast.
Soil Loosening and Fertilizing
Peppers crop best in warm, well-drained, fertile soil with a pH of about 6.0–6.8 and full sun for at least six hours a day. Loosen the soil regularly and remove weeds to keep roots aerated and competition low. Feed with a balanced fertilizer at transplanting, then switch to a lower-nitrogen, higher-phosphorus and potassium feed once flowering begins — too much nitrogen produces lush leaves but few fruit. Organic options such as Miracle-Gro Organic or well-rotted compost work well; feed every two to three weeks through the cropping period.
Container and Raised Bed Growing
Peppers grow excellently in containers and raised beds, which warm faster than open ground and suit patios, balconies and short seasons. Use a pot of at least 10–20 litres per plant with free-draining potting mix and good drainage holes. Compact and ornamental varieties thrive in pots and can even share a sunny windowsill with houseplants like a Snake Plant or Basil. Raised beds give the warm, well-drained root run peppers love; water and feed container plants more often, as nutrients leach and the mix dries quickly.
Common Pests and Pest Management
Peppers are troubled by a familiar set of pests and diseases, most of which are preventable with good airflow, crop rotation and steady watering. Watch for aphids, spider mites, flea beetles, whiteflies and slugs on young plants; many are managed by hosing off colonies, encouraging beneficial insects, or using insecticidal soap. Inspect plants regularly so infestations are caught early, and avoid working among wet foliage, which spreads disease.
Blossom End Rot and Pepper Diseases
Blossom end rot is a calcium-related disorder, not an infection, that shows as a sunken, leathery brown patch at the bottom of the fruit and is caused by uneven watering rather than a lack of soil calcium. Prevent it with consistent moisture and mulch. Other common pepper diseases to guard against include:
- Bacterial leaf spot — dark, water-soaked spots on leaves; remove affected foliage and avoid overhead watering.
- Anthracnose — sunken, dark lesions on fruit, worsened by wet conditions.
- Blight and fungal rots — improve airflow and rotate crops to break the cycle.
- Mosaic virus — mottled, distorted leaves; remove infected plants and control aphids that spread it.
- Nematodes — soil pests that damage roots; rotate crops and use clean soil in containers.
Harvesting Bell Peppers
Harvest bell peppers either at technical (mature green) ripeness or wait for full colour, depending on the flavour you want. 
Harvesting Techniques and Timing
Cut peppers from the plant with a sharp knife or secateurs, leaving a short piece of stem, rather than pulling them off and risking torn branches. Peppers do not all ripen at once, so harvest fruit by fruit as it reaches the colour and size you want, checking plants every few days at peak season. Pick everything before the first autumn frost, as cold quickly ruins both plant and fruit.
Harvesting Sweet vs. Hot Peppers
Hot peppers are gathered as the pods ripen, and most chilies are picked at full colour for maximum heat. Harvested hot peppers held in a dry room at 20–25°C will continue to ripen, turning yellow or red off the plant. Sweet peppers, by contrast, are usually taken at technical (green) ripeness or once they have coloured up. Always handle hot peppers with care — wear gloves when picking and processing pungent varieties to avoid capsaicin burns.
Storage and Preservation Methods
Fresh peppers keep for one to two weeks in the refrigerator, while drying, freezing and pickling preserve a surplus for months. Sweet peppers freeze well sliced and bagged, with no need to blanch. Hot peppers are easily dried — string them in a warm, airy spot or use a dehydrator, then store whole or ground as flakes and powder. Peppers can also be pickled, marinated or salted, the traditional uses for both sweet and hot types.
Collecting Seeds for Next Season
To save your own seed, leave the chosen fruit on the plant until it reaches full biological ripeness — fully coloured and slightly soft. Scrape the seeds from the base of the fruit with the blunt side of a knife and dry them immediately; the yield is about 4–5 g of seed per kilogram of fruit. Store dried seed somewhere cool and dark. Remember that peppers cross-pollinate within a species, so isolate varieties if you want true-to-type seed for next season.
