I got mine here: Thiomyl OSG23: Camp Lot A Noise Tropicals It's a wettable powder, which means it keeps for quite a while once wetted. I keep mine for approx a month, then make more. You drench the whole plant (leaves and potting mix) with the solution. Really wet the plant down till it squeaks. It will have white residue on the leaves if done correctly. Do both upper and lower surfaces of leaves.