Winter purslane in a balcony box: fresh greens when everything else rests
Late September is one of the last good moments to set up a balcony box for the cold season. Winter purslane thrives in cool weather and gives you leaves well into winter.
Summer is leaving the balcony, but your box doesn’t have to sit empty. Winter purslane, also called miner’s lettuce or claytonia, germinates in cool temperatures and keeps growing when other salads have long given up. If you sow now, you can cut the first leaves from late October into November.
Why winter purslane
Winter purslane (Claytonia perfoliata) is a tender, mildly nutty leaf vegetable with distinctive plate-shaped leaves. It likes cool, bright conditions and copes poorly with summer heat. That is exactly why it is so rewarding in autumn: it fills the gap once basil and tomatoes have left the balcony.
Sowing now: timing and method
You can sow from late August into October, so late September is still perfectly fine, although an earlier start gives more yield before winter. Scatter the tiny seeds thinly on fine, lightly firmed soil and cover them only with a very thin layer, since they need some light to germinate. Keep the soil evenly moist and the first seed leaves appear after one to three weeks. Later, thin the seedlings to about 5 to 10 centimeters apart.
The right box and location
The balcony box should be at least 15 centimeters deep and have drainage holes, because waterlogging is the biggest enemy in winter. A bright spot matters, and a bit of wind does no harm. Use ordinary vegetable potting soil, ideally mixed with some sand so water drains well. Extra fertilizer is barely needed, as winter purslane is undemanding.
Care in cold and frost
Winter purslane handles light to moderate frost well. During prolonged hard frost, fleece or a cover of brushwood helps, and the box is best placed close to the house wall. Water only when the soil surface has dried out, and only on frost-free days. By the way: freezing and thawing usually bothers it less than too much moisture.
Harvesting and enjoying
Cut the leaves with scissors about 2 centimeters above the soil so the plant regrows. From late autumn you can harvest regularly, and the small white flowers in spring are edible too. The leaves taste good raw in salads, on bread, or briefly steamed like spinach. Use them fresh; in the fridge they keep only a few days.
Keep track with Rootivo
To keep track of sowing and harvest dates for your balcony boxes, you can set up your boxes in Rootivo’s bed editor and record the sowing day. That way you see right away in spring what you did in autumn.