Heat-Tolerant and Bolt-Resistant Bok Choy Varieties

ByStephen Albert

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Bok choy (Pak Choi) can be sensitive to heat and long daylight, often bolting and producing bitter leaves. Selecting heat-tolerant and slow-bolting varieties is key for a consistent, tender harvest. Drawing on decades of experience growing leafy greens in Sonoma Valley, here’s a guide to the best varieties for warm-weather success.

Top Heat-Tolerant, Bolt-Resistant Bok Choy Varieties

1. Michihili

  • Slow-bolting, heat-tolerant variety
  • Large, dark green leaves with crisp texture
  • Ideal for summer planting in garden beds and containers

2. Shanghai Bok Choy

  • Resists bolting even in warmer temperatures
  • Mild, sweet flavor, tender stalks
  • Performs well in succession planting

3. Joi Choi

  • Early-maturing variety with moderate heat tolerance
  • Smooth, light green leaves
  • Great for cut-and-come-again harvests

4. White Stem Bok Choy

  • Classic variety with thick, crunchy stalks
  • Retains tenderness under heat stress
  • Suitable for both home gardens and small-scale production

Growing Tips for Heat-Tolerant Bok Choy

  • Provide partial shade during hottest part of day
  • Maintain consistent soil moisture
  • Use mulch to keep roots cool and retain water
  • Sow in succession to avoid gaps in harvest

My Experience

Over 30 years of growing bok choy, Michihili and Shanghai Bok Choy consistently perform well through warm springs and summers. By combining bolt-resistant varieties with careful watering and light shading, I harvest tender leaves even in heat-prone months.

Choosing heat-tolerant, bolt-resistant bok choy ensures flavorful, crisp leaves for summer and fall harvests.

Stephen Albert is a horticulturist, master gardener, and certified nurseryman who has taught at the University of California for more than 25 years. He holds graduate degrees from the University of California and the University of Iowa. His books include Vegetable Garden Grower’s Guide, Vegetable Garden Almanac & Planner, Tomato Grower’s Answer Book, and Kitchen Garden Grower’s Guide. His Vegetable Garden Grower’s Masterclass is available online. Harvesttotable.com has more than 10 million visitors each year.

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