Is coffee grounds safe for orchids?
Written by
Kiana Okafor
Reviewed by
Prof. Samuel Fitzgerald, Ph.D.Applying coffee grounds for orchids is a natural solution as it supplies nitrogen without synthetic fertilizers. I have been using the soaked grounds in the growing medium every month for many years, and the results have been amazing. With some preparation, it does not even lead to the issue of acidity. The grounds will also help improve drainage and the overall structure of the potting medium. Orchid roots will absorb nutrients over time, promoting steady growth and development.
Thoroughly prepare the grounds before using them. Rinse at least three times to remove the acids. To dry completely, spread them thin. Grind coarse grounds down to a powder. Combine one tablespoon of grounds per quart of water, steeping the grounds for 48 hours, preferably overnight. Before applying, the seed should be strained, and the nutrient solution is now available for plant consumption.
Nutritional Benefits
- Nitrogen promotes leaf development
- Trace minerals support root health
- Organic matter improves soil structure
- Slow release prevents nutrient burn
Preparation Steps
- Rinse three times to remove acidity
- Dry completely before grinding
- Steep 1 tbsp per quart for 48 hours
- Strain liquid before application
Monthly Application
- Apply during active growth phases
- Water roots first with pure water
- Use as soil drench not foliar spray
- Combine with monthly flushing routine
Be sure to apply coffee fertilizer properly. Always water the roots first to lessen shock. Pour the solution directly onto the potting media, being careful not to wet the leaves or pseudobulbs. I recommend applying it only during the plant's active growth period, which typically occurs from spring to fall. Do not apply it during dormancy, as I have seen the best results by doing this in combination with regular watering for some time now.
Keep track of how your orchids are responding. Darker leaf coloration can suggest that there is enough nitrogen. Also, look at the leaves for white salt crusts, which may indicate that you did not rinse them adequately. If the tips of the leaves start to brown, it is time to reduce the amount you add to the tray. Always flush approximately once a month, depending on the mix, with pure water. Flushing regularly is the key to preventing mineral buildup, allowing nutrients to work effectively.
When comparing the beneficial qualities of coffee grounds to those of chemicals, coffee grounds offer several distinct advantages. When properly prepared, they will not burn roots. They also provide necessary nutrients while attracting beneficial soil microbes. Additionally, they are a sustainable method for recycling kitchen waste. In switching to this natural option, I've observed that my orchids are developing thicker roots and blooms that last considerably longer.
Read the full article: How to Fertilize Orchids: Ultimate Guide
