If you don’t want to boil it up, you could use seaweed as a mulch over beds and borders. When should you apply it? From the end of March, when the plants are starting to grow and during the ...

Alternatively, seaweed can be used as a mulch over beds and borders if you don't want to boil it. According to Gale, the best time to apply seaweed is from the end of March, when the plants are ...