Quote Originally Posted by Dorsetman View Post
I keep a bottle of this mixture ( an ex-kitchen cleaner trigger operated spray bottle, well cleaned out ) using a proper horticultural wetting agent ( surfactant) added in the same proportion, and whenever I see anything doubtful, a quick swoosh sprayed on is helpful. I don't use washing up liquid as the surfactant since they often have glycerine added ( to be "kind" to your hands) and that tends to block up the pores of the leaves when it dries. Your actual horticultural wetting agent avolids that.
Geoff, could you give us an example of what a "proper horticultural wetting agent" is? I'm not quite sure what that is. I have always gone by the "dish soap" method, but I've been very careful to buy all-natural soap that doesn't contain any added stuff like anti-bacterial ingredients or perfumes and such. But it's next to impossible to find PURE soap any more, and you're right... many have glycerin in them. Do you have a preferred "horticultural wetting agent" that you could recommend?