How Often Should You Fertilize Houseplants?

Most houseplants benefit from a diluted fertilizer roughly every two to four weeks during the spring and summer growing season, and little to none in fall and winter. The exact timing depends on the product, so follow the label and err on the side of less.

Why do houseplants need fertilizer?

Potting soil holds only a limited supply of nutrients, and plants use them up as they grow and get watered. Fertilizer replaces what is missing. It is a supplement to good light and watering, not a fix for a plant struggling because of those.

When should I fertilize?

During active growth, typically spring through summer, when days are longer and new leaves are coming in. Plants grow slowly or rest in winter, so they need much less, and feeding them can build up salts in the soil.

How much should I use?

Follow the product label, and if in doubt, dilute it more than instructed. Many growers use half strength, more often, which is gentler on the roots than a full-strength dose. Never apply more than recommended.

Should I fertilize dry soil?

Water the plant first if the soil is very dry, then fertilize. Applying concentrated fertilizer to bone-dry roots can cause burn.

Which plants need less?

Succulents, cacti, snake plants, and ZZ plants need very little and do fine with a light feeding a few times a year. Fast growers such as pothos and monstera can take more regular feeding during the growing season.

What are the signs of too much fertilizer?

Crispy brown leaf tips and edges, a white crust on the soil surface, wilting, or stunted growth. If this happens, flush the pot with plain water so it drains freely, and pause feeding. See why leaves turn brown.

What are the signs a plant needs food?

Slow growth during the growing season, smaller new leaves, or pale overall color in a plant that has been in the same soil for a long time.

Related reading: When to repot a houseplant