Harvesting Swiss Chard: Cut-and-Come-Again for Months

Outer leaves only

Chard grows from a central crown, pushing new leaves out from the middle while the oldest sit on the outside. Pick only the outer leaves and the growing point is untouched, so the plant simply carries on. This is the whole reason chard is worth its space: one sowing crops for four to six months, and there is no other leafy vegetable in the plot that does that.

The mistake that ends this is cutting the whole plant across at the base as if it were a lettuce. Chard will usually regrow from a base cut, but slowly and with smaller leaves, and you have thrown away weeks. Reach into the plant, take the leaves on the outside, and leave the small upright ones in the center alone.

Start picking when the outer leaves are eight to ten inches (20 to 25 cm) long, which is around eight to ten weeks from sowing. There is no benefit in waiting for larger leaves; past about fourteen inches the midrib turns fibrous and the blade coarsens.

How to take a leaf

How you detach the leaf matters more than it sounds, because every stub you leave behind is a wound sitting against the crown. Four habits, applied every time you go out with a bowl, keep a plant cropping cleanly for months.

1. Choose from the outside in Work around the plant taking the largest, outermost leaves. Take them from all sides rather than clearing one side, so the plant stays balanced and does not lean.
2. Snap or cut at the base Follow the stalk down to where it meets the crown and cut with a knife or snap it sideways with a downward twist. A stub left standing rots and the rot spreads back into the crown.
3. Never take more than a third Leave at least five or six leaves on the plant. Below that there is not enough leaf area to power the regrowth, and the next flush comes small and slow.
4. Take the tatty ones too Remove yellowed and holed leaves at the same time even if you will not eat them. Leaving them shades the crown and gives leaf miner and slugs somewhere to work.

Pick in the cool of the morning when the leaves are turgid. Leaves cut in the afternoon heat are already half wilted and will not crisp up again.

How often, and how much

The regrowth interval is set by temperature and by how hard you picked. A plant in warm weather that lost a third of its leaves replaces them in about a week; the same plant stripped to two leaves in autumn takes a month. Picking little and often out-yields picking hard occasionally by a wide margin.

Record the date of each pick and roughly how much you took. After a season the pattern shows you exactly how many plants your household actually needs, which is usually fewer than people sow.

Stems and leaves are two vegetables

The midrib and the blade cook at completely different rates, so separate them as you prepare rather than after. Slice the stalk out with two cuts along the rib, chop the stems and start them five minutes before the leaves go in. Treating the whole leaf as one thing gives you either raw stems or collapsed greens.

Small leaves under six inches (15 cm) do not need this. The rib is still soft enough to cook with the blade, and those leaves are also the ones worth eating raw in a salad.

The colored stems in a rainbow mix bleed their pigment when cooked, and the yellow and red types lose color faster than the white. If you want the color on the plate, cook them briefly and separately, or use them raw.

Keeping what you cut, and when to stop

Chard does not store like a root crop; it wilts within hours of cutting on a warm day. Get it out of the sun immediately, and if you are not cooking it that day, stand the stems in an inch of water like cut flowers or wrap the leaves in a damp cloth in the refrigerator, where they hold for four or five days.

For longer keeping, blanch it. Two minutes in boiling water, straight into iced water, drained hard and frozen in portions keeps for six months and is much better than freezing it raw. Freeze stems and leaves separately, since the stems need the longer blanch.

Stop picking a plant you intend to overwinter from mid autumn. It needs to carry a full head of leaves into the cold to survive it, and a plant picked hard in late autumn usually does not come through. Equally, once a plant sends up a flower stem in its second spring, the leaves toughen quickly, so cut everything usable at once and clear it.