Growing Cut-and-Come-Again Salad in Small Trays

There is a particular pleasure in snipping a handful of peppery rocket or a fistful of baby lettuce from a tray no bigger than a seed catalogue, especially when the alternative is a plastic bag from the shop that wilts before the weekend. Cut-and-come-again salad is the most generous crop a small-space grower can sow. You do not need a raised bed, a greenhouse or even a garden — a windowsill, a balcony rail or the sunny end of a compact raised bed will do. The trick is not to grow one big crop, but to sow little and often so something is always ready.

Why small trays beat one big sowing

Salad leaves have shallow roots, which makes them ideally suited to shallow containers. A tray or trough just 5–8cm deep is plenty, provided it has drainage holes and sits on something to catch the drips. Standard seed trays, old mushroom punnets, foil roasting trays with a few holes punched in the base, and reused supermarket herb pots all work well.

• Portability: you can move trays into shade during a July heatwave, or under cover when a late frost is forecast.
• Control: pests and drought are easier to spot and fix in a tray than in open ground.
• Succession: a small tray is quick to empty, refresh and resow, so nothing sits around bolting.
• Efficiency: one 30cm tray sown thinly can give you three or four cuttings — far more leaf than the same space given to a single hearting lettuce.

Small also means light. On a north-facing balcony or a dim windowsill, choose rocket, mizuna and land cress, which tolerate less sun than lettuce.

Choosing leaves that keep giving

Look for loose-leaf and cut-and-come-again types rather than heading varieties. Iceberg and butterhead lettuces want space, time and a full season; loose-leaf lettuces such as 'Salad Bowl', 'Lollo Rossa' and 'Catalogna' will reward you with repeated cuts from the same plant.

• Lettuces: 'Salad Bowl', 'Red Salad Bowl', 'Lollo Rossa', 'Catalogna' — mild, fast and reliable.
• Peppery leaves: rocket, mizuna, mustard 'Red Frills', cress.
• Hearty leaves: baby spinach 'Medania', Swiss chard, pak choi, kale cut young.
• Herbs: chervil, coriander, parsley and dill all cut and regrow well in trays.

A pre-mixed salad leaf packet is fine, but read the contents. Some mixes include fast-bolting mustards that run to seed before the lettuces have even heartened up. If in doubt, buy two or three packets and blend your own.

Sowing little and often

The single most useful habit is to sow a small tray every two to three weeks from early March through to September. Indoors, you can start in February on a bright windowsill; outdoors, wait until the worst of the frost has passed, though hardy leaves such as rocket and land cress will shrug off a light chill.

Fill your tray with peat-free multi-purpose compost, firm it gently, then water before sowing so the seeds settle into damp ground. Scatter seed thinly — aim for roughly 1cm between seeds, which is far sparser than most people manage on a first attempt. Too dense a sowing is the main cause of damping off and weak, leggy seedlings. Cover with about 5mm of compost or fine vermiculite; salad seeds need light to germinate, so do not bury them deeply.

Germination takes seven to fourteen days at around 15–18°C. Keep the compost moist and remove any plastic cover as soon as the first seedlings appear. On a windowsill, turn the tray every couple of days so the plants grow evenly rather than leaning towards the glass.

Watering, feeding and keeping them going

Consistency matters more than quantity. Salad roots hate drying out and hate sitting in cold, soggy compost even more. Water from below by standing the tray in a washing-up bowl for ten minutes, then let it drain. This encourages deeper rooting and keeps the leaves dry, which reduces mildew.

Once you have taken your first cut, start feeding. A dilute liquid seaweed feed every fortnight is enough; trays of compost run out of nutrients quickly, and hungry leaves turn pale and tough. Good airflow is your other ally — a cramped, humid windowsill is where damping off and botrytis strike.

Watch for slugs and snails on balconies and patio trays, aphids on soft new growth, and flea beetle, which riddles rocket leaves with small holes. A fleece or fine mesh cover helps, and a saucer of water under the tray legs is a simple barrier against slugs.

Cutting for a second and third harvest

Harvest when leaves are 7–10cm tall, using sharp scissors or a clean knife. Cut about 2–3cm above the compost surface, above the growing point, and never take the whole tray at once unless you plan to resow. Cutting in bands — a strip here, a strip there — lets the rest of the tray keep growing.

Regrowth appears within two to three weeks. Loose-leaf lettuces usually give three or four cuts; rocket and mizuna, two or three before they turn woody and hot. In the height of summer, water generously and shade trays during the middle of the day to delay bolting. Pick in the cool of the morning, wash and spin the leaves, and store them in a lidded box lined with a damp cloth — they will keep for several days.

By late summer, sow hardy winter leaves such as lamb's lettuce, winter purslane and land cress. Under a cloche or on a bright kitchen windowsill, these will keep you in fresh leaves right through to spring, and the whole cycle begins again.