PRO-MIX HP MYCORRHIZAE is a premium substrate designed for high-drainage and reliable microbial support. This top-rated mix is made with a high-porosity formula that combines premium sphagnum peat moss with a significant proportion of perlite — ensuring rapid drainage and excellent aeration at the root-zone to promote explosive root growth and reduce overwatering risks. The addition of endomycorrhizal fungi improves water and nutrient uptake, enhancing root efficiency. Made without added nutrients, it gives you complete control over your feeding schedules, making it ideal for growers using custom nutrient regimens or automated irrigation systems. If you want to increase structural stability but still maintain similar microbial benefits, PRO-MIX HPCC MYCORRHIZAE has a chunkier texture that holds up great in longer cycles. For the same high porosity with an added biostimulant that offers extra stress resistance and vigor, check out PRO-MIX HP BIOSTIMULANT + MYCORRHIZAE.