How to Grow Longhorn
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Longhorn
Capsicum annuum var. longum
vegetableLonghorn peppers are a distinctive variety of sweet bell pepper characterized by their elongated, horn-like shape and thin walls. They produce abundant yields of medium-sized fruits that mature from green to red, with a sweet, mild flavor suitable for fresh eating and cooking. These plants are prolific producers and relatively easy to grow in warm climates.
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Example Longhorn timeline · Pittsburgh, PA (Zone 6b)
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Plant Longhorn
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 Longhorn
Around Jun 16≈ 60 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Longhorn dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 5-10; can be grown as annuals in cooler zones with season extension
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Seedling
2-3 weeksTiny plants with first true leaves emerging; plants are fragile and pale green. Seedlings develop their characteristic oval cotyledons followed by simple true leaves.
Maintain warm soil (70-80°F), high humidity, and bright light. Keep soil consistently moist but not waterlogged. Provide supplemental lighting if growing indoors.
Vegetative Growth
4-6 weeksPlant develops strong stems, multiple branch points, and lush green foliage. Bushy growth with increasing leaf surface area; no flowers yet.
Ensure 6-8 hours of direct sunlight daily or strong indoor lights. Maintain warm temperatures (70-85°F). Harden off transplants before moving outdoors. Begin fertilizing with balanced fertilizer every 2-3 weeks.
Flowering
3-4 weeksSmall, delicate white or pale lavender flowers appear at branch junctions. Flowers typically appear in clusters and last 1-2 days each.
Maintain consistent watering and avoid temperature fluctuations. Apply low-nitrogen fertilizer to encourage fruiting. Ensure adequate pollination through air movement or hand-pollinating with a small brush. Avoid excessive nitrogen, which promotes foliage over flowers.
Fruiting
30-50 daysSmall green fruits develop from pollinated flowers, growing into the characteristic elongated horn shape. Fruits enlarge and mature from green to bright red over time.
Maintain consistent watering (1-2 inches weekly). Apply phosphorus and potassium-rich fertilizer every 2-3 weeks. Provide support stakes or cages if heavily loaded with fruit. Remove any diseased or damaged fruits promptly.
Harvest
Continuous until frostFruits reach full size (3-4 inches long) and mature to desired color. Plants continue producing new flowers and fruits throughout the season.
Harvest regularly to encourage continued production. Use pruning shears to cut fruits cleanly. Green fruits can be harvested for cooking; allow some to mature to red for maximum sweetness. Continue watering and fertilizing for ongoing production.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with neem oil or insecticidal soap; introduce ladybugs; use reflective mulch
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Increase humidity; spray with water; use neem oil; ensure adequate irrigation
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Yellow sticky traps; spray with insecticidal soap or neem oil; release parasitic wasps
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Remove infested fruits; apply spinosad; use row covers on young plants
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Maintain consistent watering; mulch to regulate soil moisture; ensure adequate calcium
Uses
Fresh and cooked cooking
CulinaryLonghorn peppers are versatile in the kitchen, suitable for fresh slicing in salads, stir-fries, roasting, grilling, and stuffing. The thin walls make them particularly good for roasting and char-grilling. [source]
Grilling and roasting
CulinaryTheir elongated shape and thin walls make them ideal for charring over flames or roasting whole. The sweet flavor develops and intensifies when cooked. [source]
Ornamental garden appeal
HouseholdThe abundant horn-shaped fruits in contrasting green and red colors create attractive, productive garden displays that are both functional and visually appealing. [source]
Preservation and canning
CulinaryLonghorn peppers can be frozen, canned, pickled, or dried for long-term storage, making them valuable for preserving the harvest. [source]
Nutritional and antioxidant content
MedicinalRed Longhorn peppers are rich in vitamin C, vitamin A, and antioxidants like capsanthin, supporting immune function and overall health. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Begin harvesting when fruits reach 3-4 inches long. Green peppers can be picked at any time for cooking; allow 60-90 days from transplanting for fruits to mature to red for maximum sweetness. Harvest regularly (every 2-3 days) to encourage continued production. Cut fruits with pruning shears rather than pulling. In regions with long growing seasons, plants can produce continuously until the first frost.
Fun Facts
- 🌱 Longhorn peppers are called 'horns' because of their distinctive elongated, pointed shape that resembles cattle horns, making them visually distinctive among pepper varieties.
- 🌱 A single Longhorn pepper plant can produce 20-30+ fruits in a season under optimal conditions, making them highly productive and economical for home gardeners.
- 🌱 The transition from green to red takes about 20-30 additional days after the fruit reaches mature size, and red peppers have approximately 3 times more vitamin C than green peppers.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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