Cut-and-come-again lettuce: fresh leaves all summer long
Head lettuce loves to bolt in June and turns bitter. Loose-leaf lettuce, on the other hand, gives you leaf after leaf for weeks. Here's how to keep it thriving even in the summer heat.
When the days grow long and warm, a lot of lettuces shoot up before you ever get to harvest them. The good news: with loose-leaf lettuce and a few simple tricks, you’ll have fresh leaves on your plate all summer — on the balcony just as easily as in the bed.
Why head lettuce tends to bolt in June
In long days and heat, head lettuce quickly sends up a flower stalk — it “bolts.” Once that happens, the leaves turn tough and bitter, and the head is lost. In June, with more than 16 hours of daylight, the urge to bolt is especially strong. Rather than fighting nature, it pays to switch to a lettuce type that’s built for exactly this.
Loose-leaf lettuce gives you leaf after leaf
Loose-leaf or cutting lettuces like oak-leaf, Lollo Rosso or Lollo Bionda don’t form a firm head. You only ever pick the outer leaves and let the heart keep growing — the plant fills back in from the centre. That way a single small plant keeps supplying you for weeks instead of giving you one head and then quitting. Many of these varieties are also far more bolt-resistant than classic head lettuce and stay mild even in the warmth.
The light-germinator trick when sowing
Lettuce is a light germinator: the seeds need light to sprout, so they mustn’t be buried deep. Just press them in lightly or cover them with the thinnest layer of soil. Lettuce also germinates poorly above roughly 22 °C, so on hot days sow in the late afternoon and keep the seed furrow evenly moist. On a balcony, a shallow box with 15 to 20 cm of soil is plenty.
Partial shade and watering in the morning
In the summer heat, a spot with a bit of midday shade is ideal — right next to taller plants or under a light parasol. It slows down bolting and keeps the leaves tender. Water early in the morning, straight to the roots rather than over the leaves. Even moisture is the key: drought stress is one of the most common triggers for bitter, bolting lettuce.
Sow in succession for a steady supply
Instead of sowing a whole bed at once, put in a small batch every two to three weeks. That way nothing ripens all at the same time and you have young, fresh leaves the whole season. A short row or half a balcony box per batch is enough for most households. Jot down your sowing dates — otherwise it’s easy to skip a batch in the bustle of summer.
Good neighbours for the salad bed
Lettuce is an easy-going companion: it gets along well with carrots, radishes and kohlrabi, which barely take any space from it between the rows. That way you use the area twice over until the neighbours grow larger. If you’re unsure which plants get along, the companion-planting line layer in Rootivo’s bed planner draws green and red links right between your plants — so you can see at a glance what fits together.
Im Lexikon: Eichblattsalat