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SuNutri
Jalapeño Pepper
Beginner

Jalapeño Pepper

Capsicum annuum

Family: Solanaceae

Jalapeño peppers are popular hot peppers with a moderate heat level (2,500-8,000 Scoville units). They are versatile in the kitchen and productive in the garden, with each plant producing 25-35 peppers.

Days to Harvest

65-80 days

Sun Needs

Full Sun (6-8+ hours)

Water Needs

moderate

Germination Temp

80°F optimal

Seed Starting

Start Indoors

10 weeks before last frost

Germination

7-14 days

Seed Depth

1/4 inch

Light to Germinate

No

💡 Tip: Use a heat mat for consistent warm temperatures. Soak seeds for 8 hours before planting to speed germination.

Growing Conditions

Soil Type

Well-draining, moderately fertile soil

pH Range

6 - 6.8

Spacing

14-18 inches between plants

Companion Plants
TomatoesBasilCarrotsOnions

⚠️ Avoid planting near:

FennelBrassicas
History & Nutrition

History

The jalapeño pepper derives its name from Xalapa (also spelled Jalapa), the capital city of Veracruz state in Mexico, where the pepper has been cultivated since pre-Columbian times. Archaeological evidence suggests that jalapeños and related Capsicum annuum varieties have been cultivated in Mexico for at least 6,000 years, making them one of the oldest cultivated crops in the Americas. The Aztecs used jalapeños extensively, preserving them by smoking—a technique that would eventually give rise to chipotle peppers. When Spanish conquistadors arrived in the 16th century, they documented the indigenous peoples' sophisticated use of multiple pepper varieties in their cuisine. Jalapeños remained relatively unknown outside Mexico until the 20th century, when increased Mexican immigration to the United States and the growing popularity of Tex-Mex cuisine brought them into American kitchens. Today, jalapeños are the most commercially cultivated hot pepper in the United States, with over 160,000 acres under cultivation worldwide. The pepper's moderate heat level—hot enough to provide excitement but mild enough for most palates—combined with its thick flesh ideal for stuffing, has made it the world's most versatile chili pepper.

Nutritional Benefits

  • High in Vitamin C
  • Contains capsaicin with metabolism-boosting properties
  • Good source of Vitamin A
Climate & Temperature

Optimal Growing Temp

70°F - 85°F

Jalapeños thrive at 70-85°F. Night temperatures above 55°F essential for fruit set. Growth slows below 60°F and above 90°F.

Survival Range

55°F - 95°F

Can survive these temperatures

tender
warm Season

Frost Note: Killed by frost. Wait until soil is warm (65°F+) before transplanting. Use row covers if late cold snaps threaten.

Best USDA Zones

Zone 5Zone 6Zone 7Zone 8Zone 9Zone 10

Humidity

40-70%

Moderate humidity acceptable. Good air circulation prevents fungal issues.

Plant Size & Growth

Height

2-3 feet

Spread

18-24 inches

Growth Habit

bush

annual (perennial in frost-free zones)Root Depth: Moderate root system reaching 12-18 inches.
Growth Stages

Germination

10-21 days

Seeds germinate best at 80-85°F. Bottom heat speeds germination significantly.

Seedling Stage

Duration: 6-8 weeks

True leaves: First true leaves 14-21 days after sprouting

Transplant ready: Ready when 4-6 inches tall with multiple true leaves and sturdy stem.

Vegetative Growth

Duration: 4-6 weeks after transplant

Plants develop bushy form. Branching begins naturally.

Flowering

Timing: 6-8 weeks after transplant

Duration: Continuous once started

Self-pollinating. Small white flowers appear at branch nodes.

Fruit Development

Begins: 2-3 weeks after flowering

Duration: Continuous until frost

Green peppers appear within 2 weeks of flower. Ready to harvest at any color stage.

Harvest Maturity

Timing: 70-85 days from transplant (green), 90-100 days (red)

  • Glossy appearance
  • Firm flesh
  • Dark green (or red if fully ripe)
  • Slight corking/striations indicate heat development
Expected Yield

Per Plant

25-50 peppers per plant

Per Square Foot

3-5 lbs per square foot

Harvest Frequency

Every 3-5 days during peak production

Factors Affecting Yield

  • Regular harvesting encourages continued production
  • Adequate warmth critical for fruit set
  • Consistent watering increases yield
  • Too much nitrogen reduces fruiting
Watering Guide

Seedling Stage

Keep consistently moist

Established Plants

1-1.5 inches per week

During Fruiting

Consistent moisture—slightly drier encourages heat development

Preferred Method

Water at base. Drip irrigation ideal. Avoid wetting foliage.

⚠️ Critical Watering Periods

  • Flowering
  • Fruit set

Pro Tips

  • PRO TIP: Slight water stress before harvest increases capsaicin (heat) production
  • Consistent watering during fruit set prevents blossom drop
  • Mulch to maintain soil moisture
Fertilizing Guide
moderate feederRecommended: Balanced at planting, lower nitrogen during fruiting

Feeding Schedule

At Planting

Balanced fertilizer + compost

Once

Fruit Production

Low-nitrogen pepper/tomato fertilizer

Every 2-3 weeks

Organic Options

CompostFish emulsionBone mealEpsom salt

Side-dress with compost monthly. Epsom salt spray (1 tbsp/gallon) aids magnesium uptake.

Container Growing
✓ Suitable for containers

Minimum Size

3 gallon

Recommended Size

5-7 gallon

Depth Required

At least 12 inches

Best Varieties for Containers

Jalapeño MEarly JalapeñoJalafuego

Container Tips

  • Jalapeños are excellent container plants
  • Compact size perfect for patios and balconies
  • Use well-draining potting mix
  • Water when top inch is dry
Support & Trellising
Support Optional

Support Type

Optional stake if heavy fruit load

Height Needed

2-3 feet if used

When to Install

At transplanting if using

Method

Single stake provides support for heavy-producing plants.

Tips

  • Usually not needed for jalapeños
  • Stake if branches bend under fruit weight
✂️
Pruning Guide
Pruning Optional

Why Prune

Optional—can improve airflow

When

Optional

How Often

As needed

Technique

Pinching first flowers can encourage bushier growth. Remove suckers below first fork if desired.

Remove

  • Optional: first flowers to encourage plant growth
  • Suckers below main fork

Keep

  • Main branching structure
  • All upper growth
Frequently Asked Questions

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