18+ CANNABIS NUTRIENTS. Top Shelf Grower brings you the cannabis nutrients used to feed the indoor marijuana crops featured in the series. The Cannabis Nutrients featured comprise the Advanced Nutrients range. The starter rooting cubes are also fantastic and from Root Riot. These products performed excellent. Top Shelf Grower will only recommend field tested products that deliver top quality results. Advanced Nutrients are premium priced nutrients, however this guide should give you enough information to make an informed decision when it comes to purchasing a set of cannabis nutes to feed your crop. This is what works for me. Please Like & Subscribe for more. Thanks for tuning in.