September · Early autumn
What to sow in September in Seoul
16 crops are in their window this month in Seoul — timed to your local frost dates.
Last frost≈ 26 Mar
First frost≈ 11 Nov
Frost-free days71 days
September averages18°–28°C
Vegetables
13 in season
Amaranth Greens
Direct sow · pinch tips often for a steady flush of tender greens
Bitter Melon
Start indoors · harvest young and green — riper fruit turns bitter
Bush Beans
Direct sow · sow after soil warms; skip cold, wet spring soil
Cucumbers
Direct sow · trellis vines to save space and straighten fruit
Garlic
Plant cloves · plant pointy-side up for straight, strong shoots
