How often should I water my houseplants?
Why every plant guide gives different numbers, and the universal test that works for any plant.
Sera Mendel
March 2, 2026
The finger test
Push your index finger about an inch into the soil. Dry? Water. Damp? Wait. Wet? Definitely don't water.
This works for every plant except succulents (which want soil bone-dry) and ferns (which prefer always slightly damp).
Why 'water every Sunday' fails
Watering frequency depends on pot size, plant size, light, season, and humidity. A plant in a hot south-facing window in July needs water 3x as often as the same plant in a cool corner in February.
The calendar approach kills more plants than any other beginner mistake.
How much, when you do water
Water until you see it drain out the bottom of the pot. Empty the saucer 15 minutes later — sitting water rots roots.
Shallow watering (just dampening the top) trains roots to stay near the surface, where the plant gets stressed faster.
People also ask
Tap water or filtered?+
Most plants tolerate tap. Sensitive ones (calathea, prayer plants) prefer filtered or rainwater because of chlorine.
Bottom watering — better?+
Yes for some plants (African violets, fiddle leaf figs) — keeps leaves dry. Set the pot in 1 inch of water for 20 minutes.
How do I tell if I'm overwatering?+
Yellowing leaves, mushy stems, gnats hovering. Underwatering shows as crispy edges and leaf drop.