worm castings are an excellent source of nitrogen, should be mixed into the soil, not left on top ... it may 'wash down' into the soil as you water, but pretty expensive stuff to not be using it correctly ... choice is up to you ... also, go with more perlite, about 20%, if you can ... no biggie on that, it does help drainage and aeration to the roots, though ... I don't like vermiculite, holds too much moisture, and like perlite, floats around when watered ... good luck :thumbsup:
the image reaper Reviewed by the image reaper on . soil question Quick soil question. My mix is 45% top soil, 45% potting mix (no ferts), 5% Perlite, 5% Vermiculite. I ordered 25lbs of warm castings which unfortunately have not arrived yet and I had to repot - so here is the question: I repotted into 4 gallon pots and left about 4 inchs room at the top - when the castings arrived would it be good to do a top soil/warm casting mix is for the top two inches of the container??? If yes what percentages would you suggest? Any thoughts would be Rating: 5