How to Grow Jicama: Complete Planting & Harvest Guide

How to Grow Jicama: Complete Planting & Harvest Guide

Jicama (pronounced HEE-kah-mah) is one of the most refreshing vegetables you will ever taste. Beneath its rough, papery brown skin is crisp, juicy white flesh that tastes like a cross between a water chestnut and a slightly sweet apple. It is the secret ingredient in Mexican fruit salads, Asian stir-fries, and summer slaws — and it stays crunchy even when cooked.

Growing jicama is straightforward in warm climates, but it demands patience: this tropical vine needs 150-180 frost-free days to produce a decent-sized tuber. In cooler climates, it is one of the most challenging vegetables to grow — but with early starts and season extension, it is possible even in Zone 6.

Quick Facts

The Critical Safety Rule

Only the TUBER (underground root) of jicama is edible. All above-ground parts — leaves, stems, flowers, seed pods, and especially seeds — contain rotenone, a natural insecticide that is toxic to humans. This is not a concern when eating the root, but never eat any part of the vine.

Step-by-Step Growing Guide

1. Starting Seeds (Start Early!)

Jicama seeds have hard coats and benefit from pre-treatment:

1. Nick or file the seed coat (or soak in warm water 24 hours)
2. Start indoors 8-10 weeks before last frost in 4-inch pots
3. Plant seeds 1 inch deep in warm potting mix
4. Keep at 75-85°F — use a heat mat. Jicama will NOT germinate in cool soil.
5. Germination in 12-20 days (slow — be patient)
6. Grow under bright light until transplant

2. Transplanting

1. Wait until soil is warm — at least 65°F, ideally 70°F+
2. 2-3 weeks after last frost (jicama is very frost-sensitive)
3. Space plants 12 inches apart along a sturdy trellis
4. Plant at same depth as nursery pot
5. Water deeply and mulch with black plastic (warms soil)

3. Trellis (Recommended)

Jicama is a vigorous climbing vine reaching 15-20 feet:

• Sturdy trellis, cattle panel, or chain-link fence works well
• Trellising keeps vines off the ground, improves air circulation
• Alternatively, let vines sprawl on the ground (uses more space but works)

4. The Flower Removal Rule

Remove ALL flowers and developing seed pods as they appear. This is the single most important thing you can do for larger tubers.

Why: Jicama puts enormous energy into seed production. If flowers are allowed to develop into pods, the plant diverts energy from tuber growth. Removing flowers forces all energy into the underground tuber — resulting in significantly larger roots.

How: Pinch or cut flower clusters as soon as they appear (usually midsummer). Check every few days during flowering season.

5. Growing Conditions

Sun: Full sun, 8+ hours. Maximum heat. South-facing wall is ideal in marginal climates.

Water: 1-1.5 inches per week during active growth. Reduce watering 3-4 weeks before harvest — this concentrates sugars and improves flavor.

Fertilizer: As a legume, jicama fixes nitrogen. Use low-nitrogen fertilizer (5-10-10) at planting. Too much nitrogen produces lush vines but small tubers.

Soil: Sandy loam is ideal — the tuber needs to expand easily. Heavy clay produces small, misshapen tubers.

Harvesting

When to Harvest

• Minimum: 150 days from transplant for a usable tuber
• Best: 180+ days for maximum size (3-6 inches diameter)
• Must harvest before frost — frost kills the vine and damages the tuber
• Signs: Vine begins to yellow naturally in fall, or first frost threatens

How to Harvest

1. Cut vine at soil level
2. Loosen soil around tuber with a garden fork (go wide — tubers can be large)
3. Lift tuber carefully — they bruise easily
4. Brush off soil — do not wash until ready to eat
5. Dispose of all vine material (toxic — do not compost where animals can reach)

Storage

• Room temperature: 2-3 weeks (do NOT refrigerate whole — cold damages jicama below 55°F)
• Cool pantry (55-60°F): 1-2 months
• Refrigerator: Only AFTER cutting. Cut jicama in sealed container keeps 1 week.

Short-Season Strategies (Zones 4-7)

Combined: These strategies can gain 12-16 weeks, making jicama possible in Zone 6 and sometimes Zone 5 in long, hot summers.

Common Problems and Solutions

Small Tubers

The #1 jicama frustration. Caused by: short growing season, not removing flowers, insufficient heat, too much nitrogen.

Fix: Start early, use black plastic mulch, grow in the hottest spot, remove ALL flowers, use low-nitrogen fertilizer. In short seasons, aim for 4-inch tubers rather than expecting grocery store size.

Slow Germination

Seeds take 12-20 days — normal for jicama.

Fix: Nick seed coat before planting, soak 24 hours, keep at 80°F+ with heat mat. Don't give up after 1 week.

Frost Damage

Jicama is extremely frost-sensitive — even a light frost kills the vine.

Fix: Monitor weather closely in fall. Cover with row covers or harvest immediately if frost threatens. In marginal climates, be ready to harvest at first frost warning.

Frequently Asked Questions

What does jicama taste like?

Jicama has a crisp, juicy texture like a water chestnut or Asian pear, with a mildly sweet, starchy flavor. It is refreshing eaten raw — think of it as a cross between an apple and a raw potato, but juicier and less starchy. It stays crunchy when cooked (stir-fried, added to soups). In Mexico, raw jicama is served with lime juice and chili powder as a street snack.

How long does jicama take to grow?

Jicama needs 150-180 frost-free days — one of the longest seasons of any vegetable. This is 5-6 months of warm weather. In tropical/subtropical areas (Zones 9-11), this is easy. In cooler climates, start seeds indoors 8-10 weeks early and use season extension techniques to gain the extra weeks needed.

Can I grow jicama in a cold climate?

It is challenging but possible in Zones 6-7 with aggressive season extension: start seeds 8-10 weeks indoors, use black plastic mulch + Wall-o-Water at transplant, grow against a south-facing wall, and remove all flowers. Expect smaller tubers (3-4 inches vs 6+ inches in tropical climates). In Zones 4-5, jicama is very difficult and may not produce a worthwhile harvest.

Why do I need to remove jicama flowers?

Flower and seed production diverts massive energy away from tuber growth. If you let flowers develop into seed pods, the plant focuses on reproduction instead of storing starch in the tuber. Removing flowers forces all energy underground, producing significantly larger tubers. This is the single most impactful thing you can do for bigger jicama.

Is jicama vine poisonous?

Yes — only the tuber is edible. All above-ground parts (leaves, stems, flowers, seed pods, seeds) contain rotenone, a natural insecticide toxic to humans and animals. Never eat any part of the vine. Dispose of vine material safely after harvest. The tuber itself is completely safe and delicious.