How Often Should You Water Houseplants?

Overwatering kills more houseplants than anything else. The problem is that "water once a week" is advice that works for exactly one plant in one room in one season. A better approach is to learn how to tell when a plant needs water, then keep a small record so you can see its pattern.

What changes how often a plant needs water

• Light. Plants in bright light use water faster than plants in a dim corner.
• Season. Most plants grow actively in spring and summer and slow down in the cooler, darker months, so they drink less.
• Pot and soil. Small pots and terracotta dry out faster. Dense soil stays wet longer than a loose, chunky mix.
• Humidity and airflow. Dry air and a fan or open window speed up drying.
• The plant itself. A cactus and a fern want very different things.

Check the soil, not the calendar

The simplest method is the finger test. Push a finger 2 to 3 centimetres into the soil. If it feels dry at that depth, most common foliage plants are ready for water. If it is still damp, wait a day or two and check again. Another useful trick is to lift the pot. A dry pot is noticeably lighter than a wet one, and you will learn the difference after a few tries.

Rough starting points

These vary a lot with your conditions, so treat them as a place to start, not a schedule.

• Succulents and cacti: water only when the soil is completely dry, often every two to four weeks in the growing season, and far less in winter.
• Pothos, philodendron and similar trailing plants: when the top few centimetres are dry, often every one to two weeks.
• Ferns and plants that like moisture: keep the soil lightly damp, never soggy.
• Snake plant and ZZ plant: they tolerate drought well and suffer from too much water, so err on the dry side.

How to water properly

1. Water slowly until it runs out of the drainage hole.
2. Empty the saucer after about 15 minutes so the roots do not sit in water.
3. Use room-temperature water.
4. Always use a pot with a drainage hole.

Deep, less frequent watering encourages deeper roots. Small sips every day keep only the top layer wet.

Signs of too much water

• Yellowing lower leaves that feel soft
• Black or mushy stems near the soil
• Soil that stays wet for many days, sometimes with a sour smell
• Tiny flies hovering around the pot

Signs of too little water

• Drooping that perks up soon after watering
• Crispy brown leaf edges or tips
• Soil pulling away from the sides of the pot
• Slow growth and small new leaves

Keep in mind that crispy tips can also come from very dry air, and yellow leaves can come from low light or old age, so look at the whole picture before deciding.

Keep a short log

Write down the date you water each plant, and note anything odd. After a month you will see that your fern wants water every five days while your snake plant is fine for three weeks. If you move a plant to a brighter spot or the season changes, expect the pattern to shift and adjust.