Grow happier, healthier houseplants.

There is no fixed schedule. Most tropical houseplants need water when the top 2 to 5 cm (1 to 2 inches) of soil is dry. Water thoroughly until it drains, then empty the saucer. Succulents and snake plants can dry out fully between waterings. Read the watering guide.

Overwatering is the most common cause, especially when lower leaves yellow and the soil stays soggy. Too little light, underwatering, pests and natural ageing of old leaves can also cause it. Check the soil moisture first. See all 7 causes and fixes.

Snake plant, ZZ plant and pothos are the most forgiving. All three tolerate lower light and the occasional missed watering, and they recover quickly from mistakes. See 12 easy houseplants.

Spider plant, Boston fern, calathea, African violet, Chinese money plant and Christmas cactus are listed as non-toxic by the ASPCA. Pothos, snake plant, ZZ plant, monstera and peace lily are toxic to pets. See 13 pet-safe plants.

Most common houseplants grow best in bright, indirect light, such as near an east window or a few feet back from a south or west window. Low-light plants survive dimmer spots but grow slowly. Leggy stems and small leaves mean too little light. Find the right light.

Repot when roots circle the pot or grow out of the drainage holes, or when water runs straight through. Most plants need it every 1 to 2 years, ideally in spring, into a pot just 2 to 5 cm (1 to 2 inches) wider. Read the repotting guide.