1 x Biobizz Worm-Humus 40L. Worm·Humus is perfect for refreshing All·Mix, adding to substrate mixtures already in use, or preparing the garden subsoil. What is Worm·Humus?. Worm humus, also known as vermicast, is the final product of decomposed material excreted by the king of the soil – the earthworm.
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