Succession Sowing for Continuous Harvests

Every gardener knows the glut: twenty lettuces ready on the same weekend, then nothing for a month. Succession sowing solves that problem with a simple idea — sow small amounts at regular intervals, and plant a new crop as soon as an old one finishes, so harvests arrive in a steady stream rather than a flood followed by an empty bed.

It is not about sowing more in total. In fact, succession sowing often uses less seed, because you sow only what you can eat before the next batch is ready. The skill is timing, not quantity, and it works for salads, roots, beans, and many other vegetables once you know their speed of growth.

Sow little and often

The core technique is interval sowing. Instead of sowing a whole packet of lettuce in April, sow a short row — about 1 to 1.5 metres, or ten to fifteen plants — every two to three weeks from spring until late summer. By the time the first batch is finishing, the second is ready, and the third is coming on behind it.

Adjust the interval to the crop and the season. Fast crops such as radishes, which are typically ready in about four weeks, can be sown every ten to fourteen days. Lettuce and salad leaves usually suit a two- to three-week interval. Slower crops such as carrots, ready in ten to fourteen weeks depending on variety, are better sown in two or three larger batches a few weeks apart, rather than every week.

Keep notes on sowing dates and harvest dates for your garden. A variety that takes eight weeks in cool spring soil may take only five weeks in warm summer soil. After one season, your own notes will be more useful than any general table, because they reflect your soil, climate, and watering.

Label every sowing, even if you think you will remember. Small markers with the crop, variety, and date take seconds to write and save confusion when several batches look identical as seedlings.

Follow one crop with another

The second technique is follow-on planting: as soon as a crop finishes, clear it and plant something else in the same space. Early peas, for example, often finish by mid-summer, leaving a bed that can take leeks, autumn lettuce, or a late sowing of beans. Early potatoes can be followed by winter brassicas or salad leaves, provided rotation allows it.

This only works if the bed is ready. Remove old roots and debris, fork in a little compost — typically a 2 to 3 centimetre layer — water well, and then sow or plant. Do not plant into exhausted, dry soil and expect a good second crop. A quick feed of compost and a thorough watering make a real difference, especially in hot weather when a second sowing can struggle to establish.

Be careful with rotation when following on. Do not follow a crop with a close relative in the same season if you can avoid it. Our guide to crop rotation explains how to group crops so a follow-on planting does not undo your rotation plan.

Use the same bed for different speeds

A useful trick is to mix fast and slow crops in one bed. Sow radishes or salad leaves between rows of slower crops such as parsnips, brassicas, or sweetcorn. The fast crop is harvested before the slow crop needs the space, so you get two harvests from one bed without crowding.

This is sometimes called intercropping, and it works best when the fast crop is shallow-rooted and short-lived, and the slow crop is given its full spacing. Do not try to squeeze two slow crops into the same space at the same time; both will suffer. A good test is to ask whether the first crop will be gone before the second crop reaches full size. If the answer is yes, the combination is usually safe.

Another version is to plant a quick catch crop in a bed that will later hold a main crop. For example, sow lettuce in a bed in early spring, harvest it, and then plant tomatoes there in early summer once the soil has warmed. This uses otherwise empty spring ground productively.

Plan a calendar, not just a list

Succession sowing needs a calendar, even a rough one. Start with the crops you eat most often, work backwards from when you want to harvest them, and mark sowing dates at regular intervals. A simple table on paper, with months across the top and crops down the side, is enough. You do not need special software.

Include these details for each crop:

• How long it typically takes from sowing to harvest in your garden
• How much you eat in a week, so you know how much to sow each time
• The last safe sowing date for your area, after which growth slows too much
• Whether it needs protection, such as fleece, in early or late season

Protection extends succession sowing at both ends of the season. A cloche or fleece over an early sowing can bring harvest forward by a week or two, and the same protection in autumn can keep lettuce and salads going after the first light frosts. Our guide to growing lettuce year-round covers varieties and timings for a longer salad season.

In hot weather, the opposite problem appears: lettuce and some salads bolt, or run to seed, quickly. Sow heat-tolerant varieties in summer, sow in partial shade if possible, and water consistently. A succession that works in spring may need a longer interval, or a different variety, in July.

What to sow in succession

Not every vegetable suits interval sowing. The best candidates are crops you eat fresh, that grow quickly, and that lose quality if left standing. Good choices include:

• Lettuce, salad leaves, and spring onions
• Radishes and turnips
• French beans, if you have a long enough season for two sowings
• Peas, in early and mid-season batches
• Carrots, in two or three batches
• Courgettes, if you want a second plant to replace a tired first plant

Crops that are usually sown once, such as maincrop potatoes, winter squash, and parsnips, are less suited to interval sowing because they need a long season and occupy ground for months. For those, follow-on planting after an early crop is a better strategy than repeated sowings.

Herbs also benefit from succession. A small sowing of coriander or dill every three weeks gives fresh leaves over a longer period than a single large sowing that bolts all at once. See our guide to growing herbs for varieties that suit repeated sowing.

Common mistakes

The most common mistake is sowing too much at once because seed is cheap. A full row of lettuce sounds generous, but if you cannot eat it before it bolts, most of it is wasted. Sow less than you think you need, and sow again sooner.

Another error is forgetting to water a new succession in dry weather. A second sowing made into hot, dry soil in July needs more attention than a spring sowing made into moist soil. Water the row before sowing, keep the surface damp until germination, and mulch once seedlings are established.

People also forget to feed the soil between successions. A bed that has already produced one crop will not produce a second crop of the same quality without some compost and water. Treat each succession as a new planting, not as a free extra.

Finally, do not keep sowing the same variety all season without checking whether it suits the conditions. A lettuce that thrives in cool spring may bolt in summer heat. Choosing a summer variety for summer sowings, and a hardy variety for autumn, is a small change that makes succession sowing far more reliable.

Succession sowing is a habit, not a complicated system. Sow a little, sow often, clear and replant promptly, and keep simple notes. Within one season, the pattern becomes obvious: fewer gluts, fewer empty beds, and fresh vegetables to pick most weeks of the growing year.