Why cut-and-come-again is made for small spaces

If you have a windowsill, a balcony, a small courtyard or just a few steps by the back door, you can still grow a steady supply of tender salad leaves. Cut-and-come-again crops are the secret. Instead of waiting for a whole lettuce to heart up, you snip the young leaves when they are around 7–10cm tall, then let the plant regrow. One sowing can give you two, three or even four harvests from the same square of compost. The technique suits containers beautifully, because the plants never need deep soil — just a shallow trough or a recycled tub with drainage holes, a little compost and regular watering. Sow little and often, and you will have leaves for months rather than a single glut.

Choose containers that fit your space

Almost any clean container can work, provided it is at least 10–15cm deep and has drainage holes. Purpose-made plastic troughs are ideal, especially the ones that hook over a windowsill or balcony rail. But do not overlook recycled options: large yoghurt pots, mushroom trays, ice-cream tubs, supermarket herb pots, tin cans (watch for sharp edges), wooden wine boxes and lengths of old guttering. A 60cm trough will happily hold a row of salad leaves; a mushroom tray is perfect for a dense patch of rocket or microgreens. Always drill or pierce drainage holes if there are none, and stand containers on saucers or a tray to catch drips. If weight is an issue on a balcony, choose plastic rather than terracotta, and use a peat-free multipurpose compost that holds moisture without becoming sodden.

Which leaves to grow

For the cut-and-come-again method, choose loose-leaf varieties rather than hearting types. Good options include:

• Loose-leaf lettuce such as ‘Salad Bowl’, ‘Lollo Rossa’, ‘Oakleaf’ and ‘Red Salad Bowl’.
• Rocket, which is speedy and peppery.
• Mizuna, mustard greens and pak choi for a mild to spicy mix.
• Baby spinach and chard, harvested young.
• Pea shoots, which can be grown from dried peas in a shallow tray.

You can buy mixed salad seed packets, or make your own blend. Avoid crisphead or cos types that need to form a heart — they take longer and do not regrow as readily. If you are short on time, seed tapes or pelleted seed make sowing thinly much easier, especially in narrow troughs.

Sowing little and often

The phrase little and often is the heart of this method. Fill your container with compost, firm it gently and water before sowing so the seeds settle into damp soil. Scatter seeds thinly — aim for roughly one seed every 2–3cm. If you sow too thickly, the seedlings will compete and you will waste seed. Cover with a fine layer of compost, about 0.5cm deep, and water again with a fine rose. Lettuce needs light to germinate, so do not bury it deeply. Keep the compost moist but not wet; a warm, bright windowsill or a sheltered balcony is ideal. Germination usually takes 7–14 days, depending on temperature.

Rather than sowing a whole trough at once, sow a small pinch every two to three weeks from early spring to late summer. This succession means you always have a fresh batch coming on as the previous one tires. In a small space, three or four small containers at different stages will give you far more than one large one. Label each with the sowing date so you can keep track.

Harvesting for repeat crops

When leaves reach 7–10cm, they are ready to cut. Use sharp scissors or a small knife, and take the whole plant down to about 2.5cm above the compost. Do not pull it up — leave the growing point intact. Within a week or two, new leaves will sprout from the base. You can also harvest outer leaves individually from larger plants, which keeps the centre growing. Water well after cutting and give a dilute liquid feed — seaweed or comfrey is ideal — every couple of weeks to keep regrowth strong. Most cut-and-come-again crops will give two to four good cuts before they run out of steam. After that, pull the plants, refresh the compost and sow again.

Keeping the supply going

Small containers dry out quickly, so check them daily in warm weather. A layer of mulch — even a few torn leaves — helps. Slugs and snails are the main pests; check under pots and use barriers. Aphids can be washed off with a jet of water. Damping off can strike in cold, wet compost, so ensure good drainage and air flow. In hot weather, lettuce may bolt; choose slow-bolting varieties and provide afternoon shade. For winter, move a trough to a bright windowsill or use a cold frame, cloche or fleece. You can also grow microgreens on a kitchen windowsill all year round — they are ready in a week or two and need no deep compost. With a little planning, even the smallest space can keep you in fresh, tender salad leaves for most of the year.