My cousin used Green Planet stuff until he got on the same page as me. The only Green Planet nutrient that is organic is their "Medic One" which is just overpriced fish emulsion. Massive is just mineral salts with triacontanol and naturally occurring gibberellins from beeswax. He has grown with it and without it and didn't notice any difference with it. It smells like delicious candy water. I'd say, do yourself a favor and skip Green Planet, as well as any other bottled nutrient line-they're just overpriced water. I got my cousin to try Maxibloom and since then he's used either that or Jack's powdered nutrients with great success. You will be seriously much happier with your grow, the ease, lack of issues, cost, and quality. Maxibloom and Jack's are both mineral salt based, not even close to organic. If organics is something you are into-I'd recommend against bottled organic nutrients-many of them are high in heavy metals-Earth Juice, and NFTG for example. Bio Bizz is totally free of heavy metals, but good lord it's expensive-if you use the recommended products for a typical 4 plant, 4x4 ft grow, you will spend at least $500 on nutrients during the course of a grow. Look into "no till" and "Cootz Mix" for organics, this is an all-in-one soil that you just need to water, here are a couple of resources:
https://forum.grasscity.com/threads/no-till-gardening-revisited.1400505/ and
https://www.rollitup.org/t/recycled-organic-living-soil-rols-and-no-till-thread.636057/