Plagron Promix 50 LPlagron Promix is a high quality substrate formulated without added fertilizers, allowing you to feed your plants from day one at your own discretion. Made with selected peat and enriched exclusively with worm castings, Promix promotes active and healthy microbial life, making it ideal for 100% organic growing methods. Thanks to its light and airy structure, Promix guarantees excellent water retention and oxygenation in the roots, key to rapid, stress