Fertilizer for Peace Lily: NPK Guide and Application Rates
Peace Lilies (Spathiphyllum) are elegant low-light houseplants valued for their glossy leaves and white flower-like spathes. They are sensitive to over-fertilizing, which causes brown leaf tips. Light, infrequent feeding with a balanced fertilizer supports healthy growth, while a phosphorus boost can encourage blooming.
Quick Reference
What NPK Ratio is Best for Peace Lily?
The recommended NPK ratio for peace lily is 20-20-20. A balanced 20-20-20 feeds all three macronutrients equally, which works well when soil tests show no single deficiency.
Peace Lily NPK needs shift at each growth stage. Light balanced feed for young divisions during the Seedling phase, then higher phosphorus encourages white spathe production once flowering begins.
NPK by Growth Stage for Peace Lily
| Growth Stage | NPK Ratio | Notes |
|---|---|---|
| Seedling | 10N 10P 10K N 10% Nitrogen: leaf and stem growth P 10% Phosphorus: roots and flowers K 10% Potassium: health and disease resistance Learn more about NPK | Light balanced feed for young divisions |
| Vegetative | 20N 20P 20K N 20% Nitrogen: leaf and stem growth P 20% Phosphorus: roots and flowers K 20% Potassium: health and disease resistance Learn more about NPK | Balanced formula supports dark green foliage |
| Flowering | 15N 30P 15K N 15% Nitrogen: leaf and stem growth P 30% Phosphorus: roots and flowers K 15% Potassium: health and disease resistance Learn more about NPK | Higher phosphorus encourages white spathe production |
| Fruiting | 20N 20P 20K N 20% Nitrogen: leaf and stem growth P 20% Phosphorus: roots and flowers K 20% Potassium: health and disease resistance Learn more about NPK | N/A for houseplant use |
When Should You Fertilize Peace Lily?
Fertilize peace lily during the active growing season, typically March, April, May, June, July, August, September. Reduce or stop feeding during fall and winter when growth slows.
Apply quarter-strength balanced liquid fertilizer every 6 weeks during the active season. Always check soil moisture before feeding.
What Light Does Peace Lily Need?
Peace Lily thrives in low to medium light. Low light slows growth and reduces nutrient uptake, which means less fertilizer is needed in dim spots.
How Often Should You Water Peace Lily?
When leaves just begin to droop slightly. Soggy soil blocks oxygen from reaching roots and locks out nutrients, so proper watering directly affects how well peace lily absorbs fertilizer.
Signs of Over-Fertilization in Peace Lily
- Green flowers instead of white
- Brown leaf tips
- Leaf edges turning black
Signs of Under-Fertilization in Peace Lily
- No blooms produced
- Pale green leaves
- Very slow growth
What Are the Best Fertilizer Products for Peace Lily?
Look for products with an NPK close to 20-20-20. Miracle-Gro Indoor Plant Food is the most popular choice among home gardeners for peace lily.
- Miracle-Gro Indoor Plant Food
- Jack's Classic Bloom Booster
- Osmocote Smart-Release Indoor
Prices vary by retailer and region. Check current pricing before purchasing.
Container and Raised Bed Adjustments for Peace Lily
Use liquid fertilizer at quarter to half strength every 6 weeks; peace lilies are very sensitive to fertilizer salts
Common Fertilizing Mistakes with Peace Lily
- Over-fertilizing, which is the most common cause of brown leaf tips
- Using undiluted fertilizer on these salt-sensitive plants
- Expecting fertilizer alone to induce blooming without adequate light
- Fertilizing a stressed, wilted, or recently repotted plant
- Not flushing accumulated salts from the soil periodically
Tips for Fertilizing Peace Lily
- Fertilize lightly every 6-8 weeks during spring and summer only
- Brown leaf tips are the most common sign of fertilizer burn in peace lilies
- Use a bloom booster formula if you want to encourage flowering
- Flush soil with plain water every 2-3 months to remove salt buildup
- Peace lilies in low light need even less fertilizer than those in bright spots
Organic Fertilizer Alternatives for Peace Lily
Sources
Source:Clemson University ExtensionLast updated: