This latest Seaweed Concentrate is suitable for ALL types of garden, greenhouse, trees and house plants. Spring and summer is the time to be feeding your houseplants. This latest Seaweed Concentrate is suitable for all types of garden, greenhouse, trees and house plants. Liquid Seaweed is one of the best fertilisers you can give to your plants it is 100% natural and completely sustainable with any damage to the environment. It contains the nutrients your houseplants require for strong healthy growth. Liquid Seaweed is one of the best fertilisers you can give to your plants. It is organic and completely sustainable without any damage to the environment. Born from a passion for plant care and recent experiments from my horticulture course. Tried and tested by the Stem&Co team and the Prop Club community. Move away from synthetic fertilisers which can burn roots and use this natural product made from seaweed which will provide your prized plants with a good natural source of magnesium.