Jalapeno Pepper

A popular medium-heat chile pepper producing thick-walled fruits that are excellent fresh, pickled, or smoked into chipotles. Plants are compact and productive, making them well-suited for container growing on patios and balconies. Harvest green for a fresh, bright heat or allow fruits to ripen to red for a sweeter, more complex spiciness. The characteristic corking lines on the skin indicate a mature, flavorful pepper.

Start jalapeno seeds indoors 8-10 weeks before the last frost date. Sow seeds 6mm deep in a sterile seed-starting mix and maintain soil temperature at 24-29°C (75-85°F) using a heat mat. Seeds germinate in 10-14 days. Provide 14-16 hours of strong artificial light once seedlings emerge, keeping lights 5-8 cm above the plants. Transplant to individual 8 cm pots when the first true leaves appear. Harden off seedlings over 7-10 days by gradually increasing outdoor exposure before transplanting into the garden. Wait until soil temperature reaches 18°C (65°F) and all frost danger has passed.

The Season Plate

Your Jalapeno Pepper Year

Composed for Zone 7 · typical seasons · frost passes Apr 2, returns Nov 1

Sow Jalapeno Pepper Mar – May, pick Jul – Sep. Set your climate below and every date on this plate re-times itself.

Sowing window

Mar – May

re-timed to your frost dates

Plant out

after Apr 2

once frost risk has passed

First picking

around May 26

≈ 72 days from sowing · 25-35 peppers per plant

Composed for —ColdTemperateMildWarmUse my locationUsed once to set your season · only the zone is kept

Week-by-week Jalapeno Pepper reminders watering, feeding and pruning, timed to your dates

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Frost alerts for your garden a warning before a cold night costs you the crop

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Succession sowing dates so the picking never gaps mid-season

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Get my Jalapeno Pepper datesSaved to your free garden plan · no card needed

Jalapeno peppers are among the easiest hot peppers to grow and reward gardeners with a steady harvest from midsummer through fall. Start seeds indoors 8-10 weeks before your last frost date, sowing 6mm deep in warm seed-starting mix at 24-29°C (75-85°F). Seedlings emerge in 10-14 days and should be grown under strong light to prevent legginess. Transplant outdoors after nighttime temperatures consistently stay above 13°C (55°F), spacing plants 40-50 cm apart in a sunny location.

Jalapenos prefer rich, well-drained soil amended with compost and a balanced slow-release fertilizer. Water deeply but allow the soil surface to dry slightly between waterings, as overly wet conditions promote root rot. Consistent moisture during fruit set is important to prevent blossom drop and blossom end rot. Mulch around plants to retain moisture and moderate soil temperature.

Harvest regularly once fruits reach 7-10 cm long to encourage continued production. Plants typically produce 25-35 peppers per season. For hotter peppers, allow fruits to develop corking lines (small tan striations on the skin) and let them ripen to red. Pinching off early flowers can encourage stronger plant structure before allowing fruit set.

Jalapenos grow well alongside tomatoes, as both share similar growing requirements and the pepper plants can benefit from the partial shade of taller tomato plants during intense afternoon sun. Basil planted nearby is thought to improve pepper flavor and repels aphids and spider mites. Carrots and parsley attract beneficial insects that prey on pepper pests. Marigolds deter nematodes and whiteflies when planted as a border. Avoid planting near fennel, which inhibits growth of most nightshade crops, and keep away from kohlrabi and other brassicas.

The Society Table

Tomato belongs beside it. Fennel doesn't.

Old growers' knowledge, checked against Jalapeno Pepper's real companion table below — test any plant you're growing.

Grows well in the company of · 3

TomatoBasilCarrot

Keep apart · 2

FennelKohlrabi

Plant Jalapeno Pepper with good neighboursThe planner flags conflicts before they're in the ground

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View growing guide

Jalapenos thrive in well-drained, loamy soil with a pH of 6.0-6.8 enriched with compost. Work a balanced fertilizer (10-10-10) into the soil before planting. At transplanting, add a teaspoon of bone meal to each hole for phosphorus. Once flowering begins, switch to a low-nitrogen, high-phosphorus and potassium fertilizer (5-10-10) to promote fruiting. Avoid excess nitrogen, which produces abundant foliage but delays and reduces pepper production. Side-dress with compost or liquid kelp every 3-4 weeks during the growing season.

Ideal Temperature

Hardiness Zone Compatibility

Harvest jalapenos when fruits are 7-10 cm long, firm, and have a deep green color with a slight sheen. For milder peppers, pick while still smooth and uniformly green. For more heat and complexity, wait for corking lines to appear on the skin or allow fruits to ripen to red. Cut peppers from the plant with pruning shears rather than pulling, which can damage branches. Harvest regularly every few days during peak production to encourage the plant to continue setting new fruit throughout the season.

Storage & Preservation

Fresh jalapenos keep in the refrigerator for up to two weeks stored in a paper bag or perforated plastic bag in the crisper drawer. For longer storage, jalapenos pickle exceptionally well in a vinegar brine with garlic and spices, lasting months in the refrigerator. Slice and freeze on a baking sheet before transferring to freezer bags for up to 12 months. Smoke ripe red jalapenos over pecan or mesquite wood to make chipotles, which can be stored dried or packed in adobo sauce. Dehydrate sliced jalapenos at 57°C (135°F) for 8-12 hours for shelf-stable dried pepper flakes.

Pepper Maggot

Pest

Small white larvae tunneling through the interior of pepper fruits, leaving brown frass trails. Entry holes may be visible on the fruit surface, and infested peppers often rot prematurely.

Prevention Use floating row covers during the egg-laying period in early summer. Remove and destroy infested fruits immediately. Practice crop rotation and clean up garden debris in fall to reduce overwintering pupae in soil.

Fix: There is no effective treatment once larvae are inside fruits. Remove and destroy all infested peppers. Apply yellow sticky traps to monitor adult fly populations. For severe infestations, apply spinosad to deter egg-laying adults.

Bacterial Leaf Spot

Disease

Small, dark, water-soaked lesions on leaves that enlarge and develop tan centers with dark borders. Severely affected leaves yellow and drop, exposing fruits to sunscald.

Prevention Use disease-free seeds and transplants. Avoid overhead watering and working with plants when foliage is wet. Space plants adequately for good air circulation. Practice a 2-3 year crop rotation away from all pepper and tomato family crops.

Fix: Apply copper-based bactericide at first sign of symptoms, repeating every 7-10 days. Remove and destroy severely infected leaves. No cure exists for heavily infected plants, so focus on prevention in future seasons.

Aphids

Pest

Clusters of small green or yellow soft-bodied insects on new growth and leaf undersides. Leaves curl, become sticky with honeydew, and may develop black sooty mold. Plants may become stunted with heavy infestations.

Prevention Encourage beneficial insects such as ladybugs and lacewings by planting alyssum and dill nearby. Avoid over-fertilizing with nitrogen, which encourages the soft growth aphids prefer. Inspect transplants before planting.

Fix: Blast colonies off with a strong jet of water. Apply insecticidal soap or neem oil, ensuring thorough coverage of leaf undersides. For persistent infestations, introduce purchased ladybugs or lacewing larvae.

Troubleshooting Common Problems

Blossom drop is the most frequent issue, caused by nighttime temperatures below 13°C or above 24°C, inconsistent watering, or excessive nitrogen. Ensure steady conditions during flowering. Sunscald appears as white or tan papery patches on fruits exposed to intense direct sun after leaf loss. Maintain healthy foliage cover to shade developing fruits. Corking (tan stretch marks) is cosmetic and actually indicates mature, flavorful peppers. Slow growth early in the season is normal for peppers; they accelerate once soil warms above 21°C.

Growing Tips

1. Start seeds early — jalapenos need 8-10 weeks of indoor growing before transplanting, and rushing this stage produces weak, unproductive plants. Use a heat mat at 24-29°C for reliable germination in 10-14 days.
2. Pinch off the first few flowers that appear on young plants to encourage stronger root and branch development before allowing fruit to set. This results in a sturdier plant that ultimately produces more peppers over the season.
3. Water deeply and consistently but let the top 2 cm of soil dry between waterings. Jalapenos are susceptible to both blossom end rot (from inconsistent moisture) and root rot (from waterlogged soil). Drip irrigation is ideal.
4. Slight water stress during fruit development can increase the heat level of your jalapenos. If you prefer hotter peppers, reduce watering slightly once fruits begin to mature. For milder peppers, keep watering consistent.
5. Corking lines on the skin are a sign of quality, not damage. Peppers with heavy corking are prized by experienced cooks for their superior heat and depth of flavor. Do not discard corked peppers.
6. Allow some peppers to ripen fully to red on the plant. Red jalapenos are sweeter and more complex than green ones, and they are the stage required for making authentic chipotles. The plant will continue producing new green peppers simultaneously.
7. Feed with a tomato-type fertilizer (low nitrogen, high phosphorus and potassium) once flowering begins. Excess nitrogen produces lush, leafy plants with disappointing pepper yields — a very common mistake with all pepper varieties.
8. In cooler climates, use black plastic mulch and row covers to maximize soil warmth. Jalapenos grow slowly in cool conditions and may not produce well if soil temperatures stay below 21°C (70°F) during the growing season.