Overwatering vs underwatering: how to tell the difference

2026-07-01

Overwatering and underwatering are the two most common reasons houseplants struggle, and frustratingly they can look almost identical at first glance. Yellowing leaves, wilting, and a general look of misery can result from either problem, which is why so many well-meaning plant owners make things worse by adding more water when the plant is already drowning. Learning to read the specific signals each condition produces will save you a great deal of heartache and, more importantly, a great deal of plants.

Check the soil first

Before examining the plant itself, push your finger two to three centimetres into the compost. If the soil feels wet or even just cool and damp and the plant looks unhappy, overwatering is the likely culprit. If the soil feels bone dry, crumbly, or has pulled away from the edges of the pot, underwatering is almost certainly to blame. For a more reliable reading, particularly with larger pots, use a wooden skewer or chopstick and leave it in the soil for thirty seconds. A clean, dry skewer signals the plant needs water; a skewer with damp compost clinging to it tells you to hold off.

What overwatered leaves look like

An overwatered plant often has leaves that are soft, mushy, or translucent, particularly at the base of the leaf or where it meets the stem. The yellowing tends to be even and affects older lower leaves first, though in severe cases it spreads throughout the plant. You may also notice brown patches that feel waterlogged rather than crispy, and in some cases small flies hovering near the soil, which are fungus gnats attracted by persistently wet compost. The whole plant may wilt despite the soil being wet, because waterlogged roots can no longer function and the plant is effectively unable to drink.

What underwatered leaves look like

An underwatered plant tends to wilt in a way that looks more dramatic and sudden, with leaves that curl inward or droop noticeably, as though the plant is trying to reduce the surface area losing moisture. The leaves feel dry, thin, and papery rather than soft, and any browning tends to start at the tips and edges before working inward, with a distinctly crispy texture. The yellowing associated with underwatering is often patchy or uneven and may be accompanied by leaf drop. If you water a wilting plant and it perks up within a few hours, underwatering was almost certainly the problem.

Examine the roots for a definitive answer

If you are still unsure, gently slide the plant out of its pot and look at the roots. Healthy roots are firm and white or pale tan. Overwatered roots are brown, grey, or black, often smell unpleasant, and feel soft or slimy when touched, which is root rot caused by fungal activity in persistently wet conditions. Underwatered roots are also likely to be pale or brown but will feel dry, wiry, and shrunken rather than soft. They may be extremely compacted or even pulling away from the pot walls. Either condition requires prompt action, but they need very different treatments.

How to recover an overwatered plant

Remove the plant from its pot and allow the root ball to air for an hour or two on a sheet of newspaper. Trim away any black or mushy roots with clean scissors or secateurs. Repot into fresh, well-draining compost and a clean pot with drainage holes, then hold off watering for a week before giving the plant a modest drink. Improving drainage by mixing perlite into your compost is a sensible step for plants that are prone to this problem. Going forward, always check the soil moisture before watering rather than following a fixed schedule, as room temperature, season, and pot size all affect how quickly compost dries out.

How to recover an underwatered plant

For a severely dried-out plant, bottom watering is often the most effective method. Place the pot in a tray or bowl of room-temperature water and allow it to soak for twenty to thirty minutes, giving the compost time to rehydrate fully rather than having water rush straight through. If the soil has become hydrophobic and is repelling water, adding a tiny drop of washing-up liquid to the soaking water can help break the surface tension. Once the compost feels evenly moist throughout, remove the plant from the water and let the excess drain. After recovery, set a simple reminder to check your plants twice a week rather than watering on a fixed day, so you can respond to what the plant and soil are actually telling you.