5. Seaweed
If you happen to have access to seaweed, you can use it as a fertilizer for your cannabis plants.
Seaweed repels slugs and other pests. It also blocks bad weeds from sprouting in the soil and squeezing out your weed plants.
But that’s not all. Adding seaweed to your soil also helps boost your plant’s metabolism and gives it extra strength.
To ensure your soil is fertile, soak seaweed in water for two to three weeks. You can use the nutrient-rich solution to water your plants. You should also throw some seaweed directly into the soil as well.