Hi Clay, I believe insecticides that use Pyrethrum, which is derived from Chrysanthemum flowers, would be non-toxic and would work on aphids. I have used in with success on terrestrial plants. You can find this at Lowes or Home Depot, here is a link to get you started. http://homeharvest.com/insectsprayspyrethrinbased.htm' Hope this helps! Roy _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member