Coconut fiber, or coir, is becoming popular as a growing medium, but it’s important to understand its limitations and advantages before making the switch, said Julie P. Newman, farm adviser at the
Some advantages include high water-holding capacity, better air penetration and acceptable pH levels.
Coir readily absorbs water, so a wetting agent is not needed. Because of its high lignin content, coir breaks down slowly which keeps the medium structure open. This allows air to better penetrate, encouraging larger, healthier roots, she said. Coir typically lasts two to four years.
The pH of most commercially available coir ranges from 5.8 to 6.5, so liming is not required. There are no disposal problems associated with coir. It’s a waste product of the coconut industry. Coir also may deter fungus gnats and algae by keeping the surface dry.
The most common problem with coir is it can have an extremely high salt content, especially in lower grades. Coir high in salts should be leached before use.
{sidebar id=1}
Coir has a lower cation-exchange capacity and it is high in phosphorous and potassium. Growers switching from sphagnum peat to coir need to change their fertilizer practices.
For more: Julie P. Newman, (805) 645-1459; jpnewman@ucdavis.edu.
Latest from Nursery Management
- Measuring up
- Sales and profits
- Wave Petunias celebrates 30th anniversary in 2025
- Bower & Branch partners with MTM Trucking & Logistics for tree, plant delivery
- Breeding initiatives at Must Have Perennials
- Star Roses and Plants launches redesigned website
- PHS announces 2025 PHS Philadelphia Flower Show theme: 'Gardens of Tomorrow'
- A potent combo