Dividing Garlic Chives: When to Split the Clump and How to Do It

Why every clump eventually needs splitting

Garlic chives multiply underground by making new bulblets alongside the old ones each season. A single seedling becomes a clump of ten shoots, then thirty, then eighty, all packed into the same few inches of soil. Nothing goes wrong with the plant, but the crowding does the damage: the shoots get thinner every year, the center of the clump runs out of soil and dies out, and you are left harvesting from a ring of growth around a bald middle.

That bare center is the definitive signal. Two earlier signs are worth watching for as well. The regrowth interval after a cut stretching from three weeks to five means the crown is struggling to fund new leaf. And leaves coming back noticeably narrower year on year, when you have not changed how you feed, points the same way.

On a normal cropping regime this arrives every three to four years. A clump cut hard four times a season gets there faster than one cut twice.

Divide in spring or early autumn

The two workable windows are early spring, just as the first shoots appear and before the leaves are more than a few inches long, and early autumn, at least six weeks before the first hard frost. Both give the divisions warm soil and enough time to root before they face any real stress.

Spring division is the safer of the two, because the plant has the whole season ahead to re-establish. Autumn division is convenient because you have already taken your harvest, but leave it too late and the divisions go into winter with no anchoring roots and get lifted out of the ground by frost heave.

Do not divide in the middle of summer. A lifted clump in hot weather loses water faster than the damaged roots can replace it, and even if it survives it will sulk for the rest of the season.

Water the clump thoroughly the day before you lift it. Soil that is moist all the way through comes off the roots cleanly and the crown pulls apart with far less tearing than a dry one.

Lifting and splitting the clump

The whole job takes about ten minutes per clump and needs nothing more than a fork, a knife and somewhere prepared to put the divisions. The one thing to get right is the size of the pieces: divisions of four to six shoots re-establish quickly and crop the following season, while single shoots take two years to become anything useful.

1. Cut the foliage back first Trim the leaves to about four inches (10 cm) before lifting. Full-length leaves get in the way, and reducing the leaf area cuts water loss from a plant that has just lost most of its roots.
2. Lift the whole clump with a fork Push the fork in six inches (15 cm) out from the edge of the clump and lever from several sides before lifting. Going in close chops through the outer bulblets, which are the best part of the clump.
3. Wash or shake off the soil Knock the soil off, or rinse the rootball in a bucket of water if it is heavy clay. You cannot see where the natural divisions are until you can see the bulblets.
4. Pull the clump into pieces of four to six shoots Work your thumbs into the crown and ease it apart. Where it will not separate by hand, cut down through the crown with a knife. Aim for pieces about two inches (5 cm) across with white roots attached.
5. Discard the dead center The middle of an old clump is woody, rootless and will not regrow. Throw it away rather than replanting it and wondering next year why one clump did nothing.
6. Replant at the same depth, 8 to 10 inches apart Set each division so the base of the shoots sits at soil level, exactly as it was before. Space them eight to ten inches (20 to 25 cm) apart, firm well, and water in thoroughly.

Looking after the divisions

Newly split divisions have lost most of their fine feeding roots, so keep the soil evenly moist for the first three or four weeks while they rebuild. This is the one period where garlic chives are genuinely vulnerable to drying out. After that they can look after themselves again.

Do not cut anything from a division in its first season. It has the same job as a first-year seedling, which is to rebuild a crown, and it needs its leaves to do it. From the following spring it will crop normally.

Expect one four-year-old clump to give you five to eight good divisions. That multiplication is fast enough that a single plant established from seed will fill a bed within a few years without you ever buying another.

Divisions wilt for the first few days and then stand up again. That is normal and does not mean they have failed. Judge a division at three weeks by whether new central growth has appeared, not by how the old leaves look.

Propagating from seed, and why division is usually better

Garlic chives set seed freely and it germinates readily, so raising new plants from your own seed costs nothing. The drawback is time: a seedling takes a full year before it can be cut at all, and two before it crops properly, where a division is productive in its second season and is a piece of a plant you already know performs well.

Seed is worth using when you want to establish a completely new bed away from the existing plants, or when the parent clump has some problem you do not want to carry across. For simply keeping a supply going and renewing tired clumps, division wins on every count.

If you do want to save seed, let a few umbels open fully and go over. The seed heads turn from white to green to a papery brown, and the black seed is visible in the split capsules. Cut them into a paper bag before they shatter, dry them for a week, and rub the seed out. Use it the following season, because it loses viability quickly in storage.