Worm Castings Soil Booster, 15 lb

Finely screened earthworm castings that fold gently into any bed or container to rebuild structure and feed soil life. Dark, crumbly and nearly odourless, they release nutrients slowly as plants take them up, so there is little risk of burning tender roots. Work a handful into each planting hole, top-dress established plants, or blend one part castings to four parts soil.