Harvesting Loose Leaf Lettuce: Cut and Come Again Without Killing the Plant

There is no head to wait for

The advantage of loose leaf over heading types is that harvest is not a single event you have to time correctly. The first leaves are usable at three to four inches (8 to 10 cm), around 30 days from sowing for baby leaf and 40 to 45 days for full plants, and picking simply continues from there. Nothing is lost by starting early; in fact early picking encourages the plant to push new leaves from the center.

That means the question is never whether the crop is ready but how much to take at once. Take too little and the outer leaves get tough and coarse while you wait. Take too much and the plant has no leaf area left to power regrowth and stalls for a fortnight.

The one-third rule

Take no more than a third of the leaves from any one plant at a time, always the outermost ones, and always leaving the small leaves at the center untouched. Those center leaves are both the photosynthetic engine for regrowth and the growing point itself; cut into them and the plant either stops or produces distorted leaves for weeks.

Worked this way a well-fed loose leaf plant gives a picking every five to seven days in warm weather and every ten to fourteen in cool. Four to six pickings from one plant is normal before the leaves coarsen and the stem starts to elongate toward bolting.

1. Pick in the morning Leaves are fully turgid before the sun is on them. Afternoon-picked loose leaf goes limp within the hour and never fully recovers in the fridge.
2. Work from the outside in Take the largest outer leaves first, snapping them sideways at the base of the stalk so no stub is left behind.
3. Count as you go Take four or five leaves from a twelve-leaf plant and stop. Judging by eye you will always take more than a third.
4. Clear the yellowed leaves too Remove any yellowing lower leaves at the same time and take them off the bed. They are where base rot begins.

Baby leaf: cutting the whole band

A densely sown band grown for baby leaf is harvested differently. Rather than picking individual leaves, run scissors straight across the band about an inch (25 mm) above the soil, taking everything. Provided you cut above the growing points the band regrows and gives a second and usually a third cut, at roughly two-week intervals.

The regrowth is faster than most people expect but each successive cut is a little coarser. Two good cuts and a mediocre third is the realistic yield; after that, pull the band and resow rather than nursing it, because the plants are heading into bolt and the flavor goes with them.

Cut too low and you remove the growing points along with the leaves; the band does not regrow at all. An inch above the soil is not a rough guide, it is the margin.

Knowing when to stop and pull

Loose leaf tells you clearly when it is finished. The center of the rosette starts to lift and you can see a thickening stem forming inside it, the newest leaves come narrower and more upright than the ones before, and the sap at a cut leaf base runs noticeably more milky. From that point flavor declines every day.

Pull the plants at that stage rather than trying to get one more picking. The bed space is worth more than the bitter leaves, and a plant left to bolt sheds seed that comes up as weeds through your later sowings.

Keeping picked leaves and what to record

Loose leaf lettuce keeps far worse than a whole head because every leaf is a cut surface. Wash in cold water, spin or shake dry properly, and store loosely in a bag with a piece of kitchen paper at around 34 to 40F (1 to 4C). Handled that way it holds four or five days; left wet it collapses in two.

For records, note the date of each pick and roughly how much you took from each batch. Over one season that gives you the number of pickings a sowing actually yields in your conditions, which is the figure that tells you how many bands to keep in the ground. Note the date each batch was pulled for bolting too, because that date, more than any sowing date, defines the end of your season.