How to fertilize a peace lily

For a home peace lily, start with a low-dose liquid fertilizer three times a year and follow the product instructions. A commercial monthly 20-20-20 benchmark is a separate context.

Plant coveredSpathiphyllum wallisiiPeace lily · indoor container

Check for active growth

When to fertilize

What to inspect

UF/IFAS recommends low-dose liquid fertilizer for an indoor peace lily according to the product instructions three times per year. Its separate interiorscape guide describes monthly feeding with a 20-20-20 solution at a stated low nitrogen concentration. Keep that commercial benchmark separate.

What changes it

UF/IFAS gives warmer- and cooler-season fertilizer rates for commercial production, while its consumer guide recommends three low-dose applications per year indoors. Apply the area-based seasonal figures only to commercial production. Do not infer a household winter schedule beyond the consumer advice.

Follow the product label

Fertilizer type and dose

Use a low-dose liquid houseplant fertilizer according to its label. NCSU describes one-quarter of the recommended strength. UF/IFAS’s interiorscape benchmark uses a 20-20-20 water-soluble fertilizer solution, which is not a reason to ignore a household label.

For a household plant, NCSU’s bounded dose is one-quarter of the fertilizer label’s recommended strength, with soil flushed between applications. UF/IFAS reports that 20-20-20 at 50 ppm nitrogen once a month was adequate under its interior-care conditions. That value is not a direct volume dose for a home pot.

Inspect a stressed plant before feeding

When not to fertilize

Warning Signs

Over-fertilizing and salt buildup can burn peace-lily leaf tips, margins and roots. UF/IFAS advises reducing rate or frequency when media soluble salts reach 3 dS/m or higher, while NCSU recommends flushing soil between applications. These signs do not prove fertilizer injury because other causes overlap.

Sources