September · Early autumn

What to sow in September in Warsaw

9 crops are in their window this month in Warsaw — timed to your local frost dates.

Last frost≈ 10 May
First frost≈ 21 Sep
Frost-free days20 days
September averages8°–20°C

Vegetables

5 in season
Arugula
Direct sow · sow every 2-3 weeks for a steady peppery harvest
Closes 1 Sep
Garlic
Plant cloves · plant pointy-side up for straight, strong shoots
Closes 7 Sep
Radishes
Direct sow · harvest promptly once mature or roots go pithy
Closes 7 Sep
Rhubarb
Plant crowns · stop picking by midsummer to let the plant recover
Opens 21 Sep
Shallots
Plant sets · plant sets pointy-end up, just under the soil
Closes 7 Sep

Herbs · nothing to sow this month

Fruit

4 in season
Blackberries
Plant canes · thornless varieties are easiest for small gardens
Opens 21 Sep
Currants
Plant canes · prune out canes older than three years each winter
Opens 21 Sep
Gooseberries
Plant canes · mind the thorns; pick slightly underripe for pies
Opens 21 Sep
Raspberries
Plant canes · ever-bearing types fruit the first autumn
Opens 21 Sep