I've used worm poo twice now in the potting mix. Plants seem to like it, especially noticed on transplantings...no shock. it will last your entire grow.

i think of it more as an amendment to potting soil than food, because it's much lower in N than the plants will want and can take for regular feedings, so no need to worry about overkill with worm castings.

My potting mix is supersoil, perlite and wormcastings only. Drains well.
good ol daze Reviewed by good ol daze on . Worm Castings last how long.....??? Worm Castings Last how long ?? .....in your soil mixture, soilless build, standing along with perlite and vermiculite or used in a tea..... Just how long will worm castings last....meaning feed the much needed and used "N". What I use in a soil build of Foxfarm Ocean Forest Soil mix, Botanicare Ready Grow (moisture formula), Worm castings, Blood and Bone meals, Mexican and Jamaican Bat Guanos, Greensand plus, Sea Kelp (Ascophyllum Nodosum), Dolomite Lime, perlite and Rating: 5