How do I revive a plant that has dried out completely?

Why water runs straight through bone-dry compost, the soak that actually rehydrates it, and how to tell whether the plant is still alive.

Difficulty: beginner
Time: 1 hr
Read: 4 min

Short answer

Bone-dry compost repels water, so pouring from a can does nothing — it runs down the sides and out. Stand the whole pot in water for half an hour instead, then let it drain. Scratch a stem to check for green before deciding it is gone.

A completely dried-out plant is not usually a watering problem any more. It is a physics problem: dry peat and coir become water-repellent, and normal watering cannot get in.

What you'll need

A bucket, sink or basin deeper than the pot
A skewer or a chopstick
Fresh compost, if repotting is needed

Step by step

Check whether it is still alive.Scratch a stem with a fingernail. Green underneath means living tissue. Brown and brittle all the way down means that stem is dead, though the roots may still be viable.
Check the roots too.Slide the plant out. Firm, pale, flexible roots mean it can recover. Dry, brittle roots that snap like straw mean it probably cannot.
Understand why watering has not worked.Dry peat and coir become hydrophobic and the rootball shrinks away from the pot. Water follows the gap down the sides and out of the bottom without wetting the compost at all.
Soak the whole pot from below.Stand it in a bucket or sink of water up to the compost surface, for twenty to thirty minutes. Bubbles rise as air is displaced. This is the step that actually rehydrates it.
Break the surface first if it has crusted.A skewer worked gently into the compost in several places opens channels for water. Take care around the roots.
Add a drop of washing-up liquid for a bad case.One drop in the soaking water reduces surface tension and helps it penetrate severely hydrophobic compost. A little only, and only once.
Let it drain completely.Lift it out and let the excess run away. Leaving it standing in water moves the plant straight from drought to root rot, which is a real risk with a stressed plant.
Cut back damaged growth — but not immediately.Wait a day or two. Some leaves that look finished do recover, and the plant needs whatever leaves it has to rebuild. Remove only what is clearly crisp and dead.
Reduce the demand on the roots.If most leaves are lost, cut back the top growth by a third. A damaged root system cannot supply a full canopy, and reducing it improves the odds considerably.
Move it out of direct sun.Somewhere bright but shaded, and out of wind, for a week or two. Recovery needs light without the water demand that full sun imposes.
Do not feed it yet.Fertiliser on damaged roots makes things worse. Wait until you see new growth, then feed at half strength.
Water it properly from now on.Thoroughly until it runs from the base, then not again until the top few centimetres are dry. Little and often is what let it dry out in the middle in the first place.
Repot if the compost stays repellent.Compost that dries hard and refuses water even after soaking is spent. Fresh compost, ideally with some water-retaining material, is the durable fix.
Give it several weeks.Recovery is slow and it shows in new shoots rather than in the old leaves. Do not give up on a plant with green stems and firm roots too early.

Tips

Soak the pot from below. Watering from above genuinely does not work on hydrophobic compost.
Scratch the stem for green before writing anything off. Plants that look dead often are not.
Take it out of the water afterwards. Drought straight to waterlogging kills stressed roots quickly.

Common mistakes

Watering from the top and assuming it worked — Water runs down the gap between the shrunken rootball and the pot and straight out of the drainage holes. The compost in the middle stays completely dry.
Feeding it to help it recover — Damaged roots cannot handle fertiliser salts and it sets recovery back. Wait for new growth, then feed at half strength.

If it doesn't work

Water runs straight through the pot

Cause: Hydrophobic compost and a shrunken rootball — Fix: Stand the pot in water for half an hour, then drain fully.

Compost wet on top, dry underneath

Cause: Surface crust shedding water sideways — Fix: Break the surface with a skewer and soak from below.

Leaves crisp but stems green

Cause: Plant alive, foliage lost — Fix: Rehydrate, cut back the top growth by about a third, shade it, and wait for new shoots.

No recovery after two weeks and stems brown throughout

Cause: Plant dead — Fix: Nothing to be done. The compost can be reused for something else once broken up.

Recovered then wilted again

Cause: Left standing in water, or roots too damaged for the canopy — Fix: Check for root rot, reduce the top growth further, and water thoroughly but only when the surface is dry.

Questions people ask

How long should I soak it?

Twenty to thirty minutes for a small pot, up to an hour for a large one. It is ready when bubbles stop rising and the pot feels heavy.

How do I know if it is actually dead?

Scratch the stem near the base. Green under the surface means living tissue. Check several stems, since one dead stem does not mean the whole plant has gone.

Should I repot straight away?

Not usually. Repotting adds root disturbance to a plant that is already stressed. Rehydrate first, and repot only once it is growing again — or immediately if the compost will not absorb water at all.

Does this work for garden plants too?

The principle does, but you cannot lift a border plant into a bucket. Water slowly and repeatedly over hours rather than all at once, and mulch afterwards to keep it in.