I used some of this last year to pot up from a different mix that I started my seeds in. It seemed like good stuff so I started all my seeds in it this year. I have a good trusted growing/sprouting set up with heat mats that always works great for me with various seed starting mixes. This year, I had poor germination rates all around (which I could blame on my seeds), but my seedlings seem to be growing much slower than usual. Does anyone use this stuff? Do i need to add some nutrients? I may just be impatient.