How often should I fertilize houseplants?

During the growing season (spring and summer), feed most houseplants with a diluted balanced fertiliser every 2–4 weeks. Stop feeding in autumn and winter, when growth slows and the plant can't use the nutrients.

Can you over-fertilize a houseplant?

Yes, and it's common. Too much fertiliser builds up as salts in the soil and burns the roots, showing as brown, crispy leaf tips and a white crust on the soil. Always dilute, feed less than the label suggests, and flush the soil with plain water occasionally.

Do I need to fertilize at all?

Yes, eventually. Potting soil runs out of nutrients within a couple of months, so plants in the same soil for a long time slowly starve. Light feeding in the growing season, or repotting into fresh mix, replaces what's used up.

How-to

Fertilizing houseplants: when, how much, and when to stop

Published May 28, 2026

Watering keeps a houseplant alive; feeding keeps it growing. Potting mix carries only a few weeks’ worth of nutrients, so a plant left in the same soil for months slowly runs out of fuel — one reason perfectly watered plants can still stall and pale. But fertiliser is also the easiest thing to overdo. The whole skill is “enough, at the right time.”

Why plants need feeding

In the wild, nutrients are constantly replenished by decaying matter. In a pot, there’s a fixed amount, and it depletes — typically within a couple of months of fresh soil. After that, the plant is drawing down reserves. Feeding (or repotting) tops the tank back up.

What the NPK numbers mean

Every fertiliser shows three numbers — N-P-K:

N — Nitrogen: leafy, green growth.
P — Phosphorus: roots and flowers.
K — Potassium: overall vigour and resilience.

For most foliage houseplants, a balanced liquid fertiliser (roughly equal numbers, like 10-10-10) is all you need. There’s no need for a shelf of specialist bottles.

When to feed

Feed during the growing season — spring and summer — when the plant is actively putting out new leaves:

Growing season: every 2–4 weeks with a diluted feed.
Autumn and winter: stop, or feed very rarely. Growth slows, and unused fertiliser just accumulates in the soil.

A plant that isn’t growing can’t use the food you give it.

How much — less is more

The most important rule: dilute, and under-feed. Most labels suggest stronger doses than a houseplant in a pot actually needs. Use half the recommended strength, and you’ll rarely go wrong. It’s far easier to give a little more next time than to undo a chemical burn.

Signs you’re getting it wrong

Under-fed: slow growth, pale or yellowing leaves (especially between the veins), small new leaves despite good light and water.
Over-fed: brown, crispy leaf tips; a white, crusty build-up on the soil surface or pot rim; sudden leaf drop. Fix: flush the pot with plenty of plain water to wash the salts through, and pause feeding.

A simple routine

Feed only when the plant is in active growth.
Use a balanced liquid fertiliser at half strength, every 2–4 weeks.
Always feed onto damp soil, never bone-dry roots, to avoid burning.
Flush the pot with plain water every couple of months.
Stop as the days shorten and growth slows.

The honest summary

Feed lightly, feed during the growing season, and stop in winter. A balanced fertiliser at half strength every few weeks covers almost every houseplant. When in doubt, give less.

Timing is the tricky part — feeding by guesswork is how plants get both starved and over-salted. LeafPal schedules feeding per plant and per season, and reminds you to stop when the growing season ends, so the routine matches the plant’s actual appetite.