September · Early autumn
What to sow in September in Oslo
15 crops are in their window this month in Oslo — timed to your local frost dates.
Last frost≈ 8 May
First frost≈ 6 Oct
Frost-free days35 days
September averages9°–17°C
Vegetables
12 in season
Arugula
Direct sow · sow every 2-3 weeks for a steady peppery harvest
Bok Choy
Direct sow · fall crops resist bolting better than spring ones
Broad Beans
Direct sow · pinch growing tips once pods set to deter aphids
Choy Sum
Direct sow · cut flowering stems young for the most tender bite
Garlic
Plant cloves · plant pointy-side up for straight, strong shoots
