Quick Answer
Feed an orchid while it is growing leaves and roots, which is the work it does between flower spikes. With Orchid Plant Food, mix 1 teaspoon per quart (32 oz) of water and feed every 1–2 weeks in spring and summer, then every 2–4 weeks in fall and winter. Water it through the pot, or use the dunk method: submerge the pot in the diluted solution for a few minutes, then drain fully.
How to fertilize an orchid through the year
Feeding is most useful while you see active leaf, root or new shoot growth. That is when the plant is building the tissue it will flower from. For a phalaenopsis that usually means the months after a flower spike finishes, when a new leaf and fresh green root tips appear. Feed every 1–2 weeks through that period, and every 2–4 weeks when growth slows.
An orchid in bloom is not growing much; it is spending. Light feeding is fine, but there is no need to push it, and the plant will not hold its flowers longer for extra fertilizer.
| Method | Amount | How often |
|---|---|---|
| Watering can or dunk | 1 tsp per quart (32 oz) of water | Spring and summer: every 1–2 weeks |
| Watering can or dunk | Same dilution | Fall and winter: every 2–4 weeks |
| Leaf misting (optional) | ½ tsp per pint (16 oz) of water | Every 1–2 weeks |
How much fertilizer should you give an orchid?
One teaspoon per quart, no stronger. Orchids are sensitive to fertilizer salt buildup because their roots sit in open bark with air around them rather than in soil that buffers concentration. Use the fertilizer at the recommended strength rather than assuming stronger feeding produces faster results, and flush the growing medium with plain water every few feedings to prevent accumulation.
The dunk method
Mix the solution in a bowl or bucket, lower the pot in until the bark is covered, leave it for a few minutes, then lift it out and let it drain completely before it goes back in its cachepot. Bark absorbs the diluted feed and the roots take it up over the following days. It is the closest thing to how orchids feed in nature, where rain washes over roots clinging to a tree, and it wets the whole root mass evenly in a way a watering can often does not.
Liquid vs. granular orchid fertilizer
Granules have nowhere to go in a bark pot: they sit on top, release unevenly and leave concentrated salts against whichever roots they touch. A liquid at 1 teaspoon per quart reaches every root at the same strength and drains away, and the nitrate nitrogen in Orchid Plant Food is available to the roots directly rather than waiting on soil microbes the pot does not have.
Signs an orchid may be underfed
- New leaves coming in smaller than the last mature one
- No new root tips through a whole growing season
- Older leaves yellowing evenly while the roots look healthy and green
- A long gap between flower spikes on a plant in good light
Signs you may be fertilizing too much
Black or brown root tips, a white crust on the bark and leaf tips dying back are the classic signs of salt buildup in an orchid pot. Flush the pot thoroughly with plain water, let it drain, and go back to 1 teaspoon per quart on the lighter schedule. Fertilizer cannot repair roots damaged by rot or poor growing media; if roots are mushy, repot into fresh bark first.
Will fertilizer make my orchid bloom again?
Not on its own. Healthy reblooming starts with supporting the orchid while it is actively producing leaves and roots, and Orchid Plant Food provides the nutrients for that growth. But an orchid can grow healthy foliage and still not flower if light, temperature or maturity are not right. Phalaenopsis in particular set a spike after a period of cooler nights, and most orchids need brighter light than the spot they were displayed in while blooming. Keep feeding on the growth schedule, then check those conditions before adding fertilizer.
