Coconut coir has worked great for me. It holds a higher percentage of oxygen than rockwool so it's impossible to overwater (unless the medium is submerged) and I find the Ph is just fine at about 5.8-6.4. I use it for my orchids that require an acidic mix so growing my pot in it makes sense. I guess you have to find the right brand. Some of the cheaper rockwool has alot of salts in it. My plants have grown great in it with hydo fertilizers and I just switched back the lights after six weeks of growth so I guess we'll see. |