Zone-Specific Guide
Grow Choy Sum in Zone 5a
Your complete guide to growing choy sum in USDA Hardiness Zone 5a — planting windows, care tips, and harvest timing.
Spring/Fall
🌡️ Zone 5a
Days to Harvest
35–50
Spacing
6–10"
Method
Direct sow
Season
Spring/Fall
When to Plant Choy Sum in Zone 5a
Start Indoors
Feb 15 – Apr 1, Jul 1 – Aug 1
Transplant Outdoors
Apr 15 – Jun 1, Aug 1 – Sept 1
Direct Sow
Apr 1 – Jun, Aug – Sept 15
How to Grow Choy Sum in Zone 5a
📋 Key Timing Note
Spring and fall windows. Fall planting often produces better heads — less pest pressure.
Direct sow seeds between Apr 1 – Jun, Aug – Sept 15. Space plants 6–10" apart. Expect to harvest in approximately 35–50 days.
Common Pests in Zone 5a
Watch for these pests when growing choy sum in your area.
Frequently Asked Questions
When should I plant Choy Sum in Zone 5a?
Start seeds indoors Feb 15 – Apr 1, Jul 1 – Aug 1. Transplant outdoors Apr 15 – Jun 1, Aug 1 – Sept 1.
How far apart should I plant Choy Sum in Zone 5a?
Space choy sum plants 6–10" apart in Zone 5a. This gives them adequate room for airflow and root development.
What pests affect Choy Sum in Zone 5a?
Common pests for choy sum in Zone 5a 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 5a?
In Zone 5a, expect choy sum to be ready in approximately 35–50 days from planting. Spring and fall windows. Fall planting often produces better heads — less pest pressure.