How to water houseplants without killing them: checking when they need water, how much to give, drainage, top vs bottom watering, seasonal changes, tap water and rainwater, and how to spot and fix over- and underwatering.
More houseplants are killed by too much water than too little. The trick isn't a fixed schedule: it's checking each plant and watering when it needs it. Here's how.
Check before you water
- Finger test: push a finger into the compost. For most houseplants, water when the top 2 to 3 cm feels dry.
- Weight: lift the pot. Dry compost is noticeably lighter.
- Look at the plant: slight drooping in thin-leaved plants can mean thirst, but drooping with wet compost suggests overwatering.
Moisture meters can help but aren't always accurate.
Different plants, different needs
- Succulents and cacti: let the compost dry out almost completely, then water well. Very little in winter.
- Snake plants and ZZ plants: tolerate dry spells; water sparingly.
- Peace lilies, ferns and calatheas: prefer consistently moist, but not soggy, compost.
- Orchids (Phalaenopsis): water when roots look silvery, often by soaking the pot briefly, then draining well.
- Tropical foliage such as monsteras and pothos: water when the top few centimetres are dry.
How do you water?
- Use room-temperature water.
- Water slowly over the compost until water runs from the drainage holes.
- Let it drain fully. Empty saucers or decorative outer pots after 15 to 30 minutes so roots don't sit in water.
Thorough, less frequent watering is better than small sips, which leave the lower roots dry.
Bottom watering
Standing a pot in a bowl of water for 20 to 30 minutes lets compost soak water up from below. It's useful for plants that dislike wet leaves, such as African violets, and for compost that has dried out and shrunk from the pot. Drain afterwards. Water from the top occasionally to flush out salts.
Drainage matters
Pots should have drainage holes. If you use a decorative pot without holes, keep the plant in a plastic pot inside it, and tip out any excess water. A layer of gravel at the bottom doesn't improve drainage; a well-draining compost does.
Seasons
Most houseplants grow more slowly in winter, with less light, and need much less water. Central heating can dry the air but not necessarily the compost. Check before watering and expect to water less often from autumn to early spring.
Tap water or rainwater?
Most houseplants are fine with tap water. In hard water areas, lime-sensitive plants such as some carnivorous plants and azaleas prefer rainwater. Letting tap water stand doesn't remove hardness.
Signs of overwatering
- yellowing lower leaves;
- wilting despite wet compost;
- soft, brown stems or roots;
- fungus gnats around the compost;
- a musty smell.
Fix: stop watering, let the compost dry, and check the roots. Healthy roots are firm and pale; rotten ones are brown and mushy. Trim rotten roots and repot into fresh, free-draining compost if needed.
Signs of underwatering
- dry, crispy leaf edges;
- compost pulling away from the pot sides;
- drooping that recovers quickly after watering.
Fix: soak the pot (bottom watering works well), then return to regular checks.
Going on holiday
Water thoroughly before leaving, group plants together out of direct sun, and use self-watering spikes or a tray of damp gravel for a week or two. Ask someone to water for longer trips.
Frequently asked questions
Should I mist my plants?
Misting raises humidity only briefly. Grouping plants or using a humidity tray helps more.
How often should I water?
There's no fixed schedule: check the compost.
Sources and further reading
Facts checked on 20 October 2026. Spotted an error? Tell us and we will correct it.