I have tried their "Grow" formula, but here I will talk about the "Big Bloom" formula. I used this for some outdoor plants in their Bloom phase along with some organic Bloom Boosters. One plant I used just the Fox Farm Big Bloom and it actually kept right up with the other plants that were receiving PK spikes! The only difference was size and density, while the test plant gave up on production the last 2 weeks (which is typical for plants to do in their last week or two), the other plants were able to pump out some last minute production with help from the Bloom Boosters I was using. Besides that, the plant given only Fox Farm did very well compared the the plants that were spiked.
This stuff is super organic and to say the least, it's pure earth. You just "feel" so organic when you use it. Very thick stuff and it's gotta be shaken before use very well. The ingredients are elements that are centuries old in horticulture. It mostly consists of Liquefied Bat Guano and Earthworm Castings. In other words, it's a bottle of liquid bat shit and liquid worm shit. Oh, and a little liquid bird shit too. Yum, the plants love it! It also contains some sea ingredients like kelp, which the roots go crazy over, making way for a fast growing plant. This stuff will help build the biological spectacular happening in your soil so much that your soil will quite literally be "alive" with beneficial biological life constantly creating and delivering to your plant essential micro and macro nutrients along with elements and enzymes from A to Z. Your soil under a microscope will be like a whole 'nother world. With shopping malls and restaurants. HERE is Fox Farm's web site. Be well...