Compost yes but that is usually malibu and or oly mntn fish compost and those aren't gonna be heavy in nutrients but have tons of microbial biodiversity! Cow poop compost plus worm castings and liquid ones are all high in N and other stuff which becomes available right away after brewing! Why a life cube and solid castings or even getting good compost not made from doo-doo to brew up! Oly stuff is made from tree waste from logging and then fish carcasses from fishing stuff (place is outta washington state) and compost it together so the fishy goodness gets jnto the sticks! Then it goes so long its soft and black and shit! Wild bill knows wassup its bomb compost if u can get it! I can get it from local garden shop for $30 a bag unless he is low on gummies then i get it free!