sul po mag
I had a late soil test done on some veg beds this year and now they are already planted. I need to add a small amount of sul po mag or langbeinite and am having trouble finding any to purchase. Normally, I order my soil amendments from Fedco in the winter, but it's too late to buy from them now without an extremely long drive and wasting a whole day. Several garden centers I've called have no idea what it is, one says they can special order it in a 50 # bag, but I need at most, 8 pounds.
Does anyone know of a retail product that will provide all three that a garden center might carry? I live in Maine, can anyone recommend a brick and mortar store that would carry it? Otherwise, I can order online and pay shipping, or I guess I could add them all separately choosing 3 fast acting sources. I'd have to guess on amounts, though.