How to Grow Mustard Greens: Complete Planting & Harvest Guide

How to Grow Mustard Greens: Complete Planting & Harvest Guide

Mustard greens are the spicy rebel of the leafy green world. Where spinach is mild and lettuce is bland, mustard greens bring bold, peppery heat that wakes up any dish. They grow fast (30-60 days), tolerate cold, and produce abundantly with minimal effort — making them one of the best greens for beginner gardeners.

In the American South, mustard greens are a culinary staple — slow-cooked with smoked ham hocks and pot liquor. In Asian cuisine, they appear as pickled mustard (Chinese suan cai), Korean kimchi (gat kimchi), and Indian sarson ka saag. No matter how you cook them, growing your own ensures the freshest, most flavorful greens possible.

Quick Facts

Best Mustard Green Varieties

Mild Varieties (Great for Beginners)

Tendergreen (Komatsuna) — Japanese mustard spinach with a very mild, sweet flavor. Thick, tender leaves. 35-45 days. The mildest mustard green — perfect if you are new to the flavor.

Florida Broadleaf — Large, flat leaves with mild mustard flavor. The classic Southern cooking variety. 45-55 days. Heavy producer.

Medium Heat

Southern Giant Curled — Bright green, heavily frilled leaves with moderate peppery bite. Beautiful texture. 50-60 days. The most popular home garden variety.

Green Wave — Deeply curled, very ornamental leaves with good flavor. All-America Selections winner. 45 days. Bolt-resistant.

Hot Varieties

Red Giant (Osaka Purple) — Stunning purple-red leaves with strong mustard heat. 45 days. As beautiful as it is spicy — gorgeous in salads and as a garnish.

Ruby Streaks — Deeply cut, feathery purple leaves with intense peppery flavor. 40 days. Looks dramatic in salad mixes.

Asian Varieties

Mizuna — Feathery, mild Japanese mustard. 35-40 days. Excellent in stir-fries and salads. Very bolt-resistant.

Gai Choy (Chinese Mustard) — Large, thick-stemmed variety used in Chinese cooking. Strong flavor, excellent for pickling. 45-55 days.

Step-by-Step Growing Guide

1. When to Plant

Mustard greens thrive in cool weather (45-75°F) and bolt quickly in heat.

Spring: Direct sow 4-6 weeks before last frost. Mustard greens tolerate frost to 20°F.

Fall (BEST): Sow 6-8 weeks before first fall frost. Cooling temperatures produce the mildest, most tender greens and delay bolting.

Succession planting: Sow every 2-3 weeks from early spring through late fall for continuous harvest. Skip midsummer in hot climates.

2. Planting

Direct sow — mustard greens germinate so fast (3-7 days) that starting indoors is unnecessary.

1. Scatter seeds 1/4 inch deep, 1 inch apart, in rows 12-18 inches apart
2. Or broadcast over a bed and lightly rake in for cut-and-come-again baby greens
3. Seeds germinate in 3-7 days (very fast)
4. Thin to 6-12 inches apart when seedlings are 3-4 inches tall
5. Eat the thinnings — baby mustard greens are delicious

3. Growing Conditions

Sun: Full sun in cool weather; partial shade (4 hours) in warm weather to prevent bolting.

Soil: Almost any well-draining soil. Not fussy. pH 6.0-7.5.

Water: 1-2 inches per week. Consistent moisture is important — drought stress makes leaves tough and bitter.

Fertilizer: Light feeder. Work compost into soil before planting. One side-dressing of balanced fertilizer at 3 weeks is sufficient.

Harvesting

Baby Greens (21-30 days)

Cut leaves at 3-4 inches for mild, tender baby mustard greens. This is what appears in premium salad mixes. Cut 1 inch above soil — plants regrow 2-3 times.

Full-Size Harvest (40-60 days)

Pick outer leaves individually as needed, leaving the center to keep growing. Or cut the entire plant at soil level. Leaves are best at 6-10 inches — larger leaves are tougher and more bitter.

Tips

• Morning harvest for best crispness
• Young = mild, old = spicy — harvest size controls heat level
• Cold weather = milder flavor — fall mustard greens are sweeter
• Flowers are edible — buds and flowers have concentrated mustard flavor

Cooking Mustard Greens

Raw (Salads)

Baby mustard greens add peppery punch to salad mixes. Mix with milder greens (lettuce, spinach) for balance. Red Giant and Ruby Streaks are stunning in salads.

Southern Style (Slow-Cooked)

The classic preparation:

1. Wash and roughly chop large leaves
2. Cook smoked ham hock or bacon in a large pot until rendered
3. Add chopped greens in batches (they wilt dramatically)
4. Add chicken broth, apple cider vinegar, hot sauce, salt
5. Simmer 45 minutes to 1 hour until very tender
6. The cooking liquid ("pot liquor") is prized — sop with cornbread

Asian Style

• Stir-fry: Quick-cook with garlic, ginger, soy sauce, sesame oil
• Pickled: Salt and ferment for Chinese suan cai or Korean gat kimchi
• Soup: Add to miso soup or ramen in the last 2 minutes
• Indian: Sarson ka saag — mustard greens with spinach, ghee, and spices

Common Problems and Solutions

Flea Beetles

Tiny jumping beetles creating shot-hole damage. The #1 mustard green pest.

Fix: Floating row covers (most effective), diatomaceous earth, interplant with trap crops (radishes attract them away). Young seedlings are most vulnerable — once plants are established, they outgrow the damage.

Bolting

Premature flowering caused by heat (above 75°F) or long days.

Fix: Plant for fall harvest, provide afternoon shade, choose bolt-resistant varieties (Green Wave, Mizuna), succession plant every 2-3 weeks so you always have young plants.

Aphids

Clusters on undersides of leaves, especially on new growth.

Fix: Strong water spray to dislodge, insecticidal soap, attract ladybugs. Check regularly — aphids reproduce fast.

Bitter or Tough Leaves

Caused by heat stress, drought, or harvesting too late.

Fix: Keep soil consistently moist, harvest younger/smaller leaves, grow in partial shade during warm months, grow in fall for sweetest flavor.

Frequently Asked Questions

How fast do mustard greens grow?

Mustard greens are one of the fastest vegetables. Seeds germinate in 3-7 days, baby greens are ready in 21-30 days, and full-size plants mature in 40-60 days. This speed makes them perfect for succession planting and for filling gaps between slower crops. You can go from bare soil to harvest in under a month.

Are mustard greens spicy?

Yes — mustard greens have a peppery, mustardy heat that ranges from mild to quite hot depending on variety and growing conditions. Tendergreen and Florida Broadleaf are mild; Red Giant and Ruby Streaks are hot. Young leaves are milder than mature ones. Cold weather reduces heat; hot weather intensifies it. Cooking also mellows the spiciness significantly.

Can I grow mustard greens in summer?

Mustard greens struggle in summer heat (above 75°F) — they bolt quickly and become bitter. In hot climates, grow them in spring and fall only. If you must grow in summer: choose bolt-resistant varieties (Mizuna, Green Wave), provide afternoon shade, keep soil very moist, and harvest as baby greens before they bolt. Fall planting is always the best option.

Do mustard greens regrow after cutting?

Yes — if you cut 1 inch above soil level, mustard greens regrow for 2-3 additional harvests. Each regrowth is slightly more peppery. For continuous supply, combine cut-and-come-again with succession planting (new seeds every 2-3 weeks). After 3 cuts, plants usually bolt — pull and resow.

What is the difference between mustard greens and collard greens?

Mustard greens (Brassica juncea) have a peppery, mustardy flavor and thinner leaves that cook faster. Collard greens (Brassica oleracea var. viridis) have a milder, slightly bitter, cabbage-like flavor and thick, sturdy leaves that require longer cooking. Both are Southern staples but they are different species with distinct flavors. Mustard greens cook in 30-60 minutes; collards need 1-2 hours for traditional tenderness.