Overwatering kills more houseplants than neglect ever will. How to read your plant, your soil and your pot — and water like you mean it.
If I could teach one houseplant skill, it would not be light, or fertiliser, or pest control. It would be watering — specifically, the art of not doing it too often. The overwhelming majority of houseplant deaths are drownings dressed up as care.
The finger test
Push a finger two to three centimetres into the compost. If it is damp, stop. If it is dry, water. This single habit will save more plants than any gadget. Moisture meters are unreliable in small pots, and schedules are worse — a plant in a cool north room in January needs a fraction of the water it needed in July.
Water thoroughly, then wait
The right way: water until it runs out of the drainage holes, let it drain completely, empty the saucer. The wrong way: a little splash every few days, which wets only the surface and leaves the lower roots dry. Deep, infrequent waterings encourage deep roots; frequent sips encourage weak ones.
Read the plant
Leaves that droop and feel soft are thirsty. Leaves that yellow, drop, or feel mushy while the compost is wet are drowning. Crispy brown edges usually mean inconsistent watering — long droughts followed by floods. Learn your plant's particular complaint; they are all different.
Pot, compost and season matter
A terracotta pot dries faster than plastic. A chunky, airy compost dries faster than a dense one. A plant in a warm sunny room dries faster than one in a cool hall. In winter, most plants need half the water — or less — of summer. Adjust for all of it, and never water on autopilot.
When in doubt, wait
A plant can survive a dry week; it cannot undo a soggy month. If you are unsure, wait a day and check again. The kindest thing you can do for most houseplants is to leave them alone a little more often.