How to Grow NM Big Jim Pepper
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NM Big Jim Pepper
Capsicum annuum 'NM Big Jim'
vegetableNM Big Jim is a large, mild chile pepper variety developed by New Mexico State University, known for producing massive 8-10 inch long peppers with thin walls ideal for roasting. This heat-tolerant cultivar produces high yields and has become a staple in southwestern cuisine and home gardens. The peppers mature from green to a deep red color and have a mild, slightly sweet flavor perfect for fresh use, roasting, or drying.
When should you plant NM Big Jim Pepper in your zone?
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Example NM Big Jim Pepper timeline · Pittsburgh, PA (Zone 6b)
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Plant NM Big Jim Pepper
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest NM Big Jim Pepper
Around Jul 1≈ 75 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact NM Big Jim Pepper dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-11, with best performance in zones 7-10. Can be grown in cooler zones (4-6) in warm microclimates or with season extension.
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Get my NM Big Jim Pepper timeline →Growth Stages
Seedling
4-6 weeksSmall plants with 2-4 true leaves, emerging 7-14 days after seed germination at 70-80°F soil temperature.
Provide bright light (grow lights 2-3 inches above seedlings), maintain moist soil, keep warm, and thin to one plant per cell.
Vegetative Growth
4-6 weeksRobust green plants developing multiple stems and branches, 8-12 inches tall with numerous leaves when ready for transplanting.
Harden off seedlings gradually before transplanting outdoors. Space 18 inches apart. Stake or cage plants to support eventual heavy fruit load. Begin light fertilization.
Flowering
3-4 weeksSmall white flowers appear at branch junctions, typically 8-10 weeks after transplanting. Flowers indicate imminent fruit set.
Maintain consistent watering and warmth (65-85°F optimal). Provide balanced fertilizer with adequate potassium and phosphorus. Avoid excessive nitrogen which encourages foliage over flowers.
Fruiting & Growth
6-8 weeksPeppers develop from flowers, quickly elongating to 8-10 inches. Young peppers are dark green, then gradually mature to deep red over 3-4 weeks.
Support heavy fruit with cages or stakes to prevent branch breakage. Maintain regular watering (soil should never fully dry out). Fertilize every 2-3 weeks with balanced or slightly lower nitrogen formula.
Harvest
6-12 weeks until frostPeppers reach full length and color. Green peppers are harvestable in 75-90 days; red peppers develop optimal sweetness after 100+ days.
Harvest green peppers to encourage continued production, or allow to fully mature to red for sweeter flavor. Use pruning shears to cleanly cut peppers. Continue harvesting until first frost.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with neem oil or insecticidal soap; increase humidity; strong water spray to dislodge; introduce predatory mites if severe.
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Spray with neem oil or insecticidal soap; encourage beneficial insects like ladybugs; remove affected leaves; reflective mulches deter.
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Use yellow sticky traps; spray with neem oil or spinosad; maintain good air circulation; remove affected flowers.
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Spray with neem oil or insecticidal soap; use yellow sticky traps; introduce parasitic wasps; increase air circulation.
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Use cardboard collars around young seedlings; apply diatomaceous earth; handpick at night; eliminate garden debris harboring pupae.
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Remove and destroy affected fruit; use insecticidal sprays containing spinosad; practice crop rotation; eliminate volunteer pepper plants.
Uses
Roasting & Chiles Rellenos
CulinaryNM Big Jim peppers are legendary for roasting due to their thin walls and mild flavor. Roast whole over open flame or under broiler to blister the skin, then peel and remove seeds for stuffing with cheese, meat, or vegetables. The peppers are also excellent for fresh consumption, salsa, and southwestern cuisine. [source]
Drying & Powdering
CulinaryMature red peppers can be dried whole or in strips to make traditional chile powder and spice blends. The dried peppers store for months and can be rehydrated for sauces or ground into powder for seasoning. This creates a pantry staple with concentrated chile flavor. [source]
Fresh & Cooked Dishes
CulinaryThe mild, slightly sweet flavor makes NM Big Jim versatile for sautéing, grilling, stuffing, or eating fresh. Use in stir-fries, fajitas, sandwiches, or as a vegetable side dish. The large size provides substantial flesh ideal for chunking or slicing. [source]
Seed Saving
HouseholdNM Big Jim is an open-pollinated variety, allowing gardeners to save seeds from mature peppers for planting next season. Allow peppers to fully ripen on the plant, then extract, dry, and store seeds in cool, dry conditions for future use. [source]
Nutritional & Health Benefits
MedicinalPeppers are rich in vitamin C, vitamin A, and antioxidants. Even mild varieties like NM Big Jim provide capsaicin's anti-inflammatory properties and support for cardiovascular and digestive health. Fresh or cooked peppers contribute to a nutritious diet. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest NM Big Jim peppers when they reach full size (8-10 inches). Green peppers can be picked at 75-90 days for a mild, fresh flavor ideal for roasting and chiles rellenos. For sweeter, deeper flavor and heat (still mild), allow peppers to fully mature to red, which takes an additional 20-30 days. Use clean pruning shears or a sharp knife to cut peppers at the stem, leaving the plant intact for continued production. Harvest regularly to encourage more flowering and fruit set. Stop harvesting 4-6 weeks before the first expected frost to allow the plant to focus energy on ripening remaining peppers.
Fun Facts
- 🌱 NM Big Jim was developed at New Mexico State University's Agricultural Extension in the 1970s and remains one of the most popular chile pepper varieties in the American Southwest. It was deliberately bred to produce extra-large peppers suitable for commercial and home cultivation in arid climates.
- 🌱 Despite their impressive 8-10 inch length, NM Big Jim peppers are extremely mild, registering only 900-1,200 Scoville Heat Units (compared to jalapeños at 2,500-8,000 SHU), making them approachable for heat-sensitive palates while still offering authentic chile flavor.
- 🌱 A single mature NM Big Jim plant can produce 20-40 large peppers in a growing season under ideal conditions, making it an exceptionally prolific and rewarding variety for home gardeners seeking high yields with minimal space.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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