Zone-Specific Guide
Grow Choy Sum in Zone 6a
Your complete guide to growing choy sum in USDA Hardiness Zone 6a — planting windows, care tips, and harvest timing.
Spring/Fall
🌡️ Zone 6a
Days to Harvest
35–50
Spacing
6–10"
Method
Direct sow
Season
Spring/Fall
When to Plant Choy Sum in Zone 6a
Start Indoors
Feb 1 – Mar 15, Jul 1 – Aug 1
Transplant Outdoors
Apr 1 – May 15, Aug 15 – Oct 1
Direct Sow
Mar 15 – May, Aug – Oct
How to Grow Choy Sum in Zone 6a
📋 Key Timing Note
Two good windows. Fall brassicas are often the best crop of the year.
Direct sow seeds between Mar 15 – May, Aug – Oct. Space plants 6–10" apart. Expect to harvest in approximately 35–50 days.
Common Pests in Zone 6a
Watch for these pests when growing choy sum in your area.
Frequently Asked Questions
When should I plant Choy Sum in Zone 6a?
Start seeds indoors Feb 1 – Mar 15, Jul 1 – Aug 1. Transplant outdoors Apr 1 – May 15, Aug 15 – Oct 1.
How far apart should I plant Choy Sum in Zone 6a?
Space choy sum plants 6–10" apart in Zone 6a. This gives them adequate room for airflow and root development.
What pests affect Choy Sum in Zone 6a?
Common pests for choy sum in Zone 6a include flea beetles, aphids. Use companion planting and row covers as first-line defense.
How long until Choy Sum is ready to harvest in Zone 6a?
In Zone 6a, expect choy sum to be ready in approximately 35–50 days from planting. Two good windows. Fall brassicas are often the best crop of the year.