The single most common way to kill a houseplant is not neglect — it is overwatering. Roots need air as much as water, and soil that never dries out suffocates them, leading to root rot.

Forget the weekly schedule

“Water every Sunday” is the advice that kills the most plants. How fast a pot dries out depends on the plant, the pot size, the light, the season, and how dry your home’s air is. A pothos in a bright, warm room in July needs far more water than the same plant in a dim corner in January.

Read the soil, not the calendar

Push a finger about two to three centimetres into the soil. If it feels moist, wait. If it feels dry, water. For most common houseplants — pothos, philodendron, monstera, snake plants — letting the top third of the soil dry out between waterings is close to ideal.

A few exceptions want to stay evenly moist (ferns, calatheas), and a few want to dry out almost completely (succulents, cacti, snake plants). When in doubt, err on the side of too dry. A thirsty plant recovers in hours; a drowned one rarely recovers at all.

How to water well

When you do water, water thoroughly: pour until it runs out the drainage holes, then tip out the saucer after a few minutes. Shallow sips leave the lower roots dry and encourage shallow, weak growth. Deep, infrequent watering builds healthier roots.

Signs you are getting it wrong

  • Yellow, soft, drooping leaves and damp soil usually mean too much water.
  • Crispy brown leaf edges and bone-dry soil usually mean too little.

Both can look like “wilting,” so always check the soil before reaching for the watering can.