Repotting Echeveria: Pot Size, Gritty potting mix and Working Dry

When it needs doing

Echeveria does not demand repotting often. Every second year in spring or early autumn is plenty, and a plant in good gritty potting mix can go longer. The reasons to do it sooner are almost always about the compost or the pot rather than about the roots running out of room.

Pot size and material

The instinct to give a plant room to grow is wrong here. A pot much wider than the rosette holds a volume of damp compost that the small root system never reaches, and that unused wet compost is what rots the roots. Choose a pot that leaves half an inch (1 cm) of compost around the rootball and no more.

Depth matters too. Echeveria roots are fine and shallow, so a shallow bowl suits them far better than a deep pot, and it dries far faster.

If you buy an echeveria in a glued-in decorative pot, take it out and check the roots. Plants are routinely sold set into pots with no drainage at all, and that plant is on a timer until you repot it.

The compost mix

The requirement is simple: the mix must drain within seconds and dry out completely within a week or so. Bagged cactus compost varies enormously in quality, and most of it is still too rich, so cut it with grit whatever the bag says.

Aim for roughly half mineral material by volume. That looks alarmingly stony to anyone used to houseplant compost, and it is correct.

How to repot

The whole operation is done dry. Dry compost falls off the roots without tearing them, damaged roots can be seen and removed, and the cut surfaces seal instead of rotting. Stop watering a week before you plan to do it.

1. Ease the plant out by the stem Lay the pot on its side and support the rosette from underneath rather than gripping the leaves, which knocks off the farina and snaps leaves at the base.
2. Crumble all the old compost away Work the old mix off the roots with your fingers, especially if it was peat based. Leaving a wet core of old compost inside fresh gritty mix defeats the whole exercise.
3. Cut off dead and damaged roots Healthy roots are pale and wiry. Anything brown, hollow or slimy comes off with clean snips. If you remove a lot, leave the plant bare in bright shade for a day so the cuts dry.
4. Set it at the same depth Position the plant so the lowest live leaves sit just clear of the compost surface. Planted deeper, the buried leaf bases rot; planted higher, it will not stand up.
5. Fill with dry mix and tap it down Trickle dry compost in around the rootball and tap the pot on the bench to settle it. Do not press it down hard, which compacts the mix and drives out the air.
6. Top with grit and wait a week Add a thin layer of grit around the stem, then stand the plant in bright shade and give it no water for a week. Then water thoroughly once and return it to full light gradually.

Feed lightly at most. A half-strength balanced feed two or three times over the growing season is enough. Well-fed echeverias grow soft, green and loose, which is the opposite of what you want.

After repotting, and what to note

A repotted echeveria usually looks slightly limp for a fortnight and then carries on. Judge it by the center of the rosette: as long as new leaves are appearing there, the roots have taken.

Write down the date and the pot size each time you repot. Two entries tell you your own interval, and a note of which mix you used lets you compare how fast different pots dry, which is the single most useful thing you can know about your own plants.