Krista I used a similar product to mosquito bites, called mosquito dunks which are made for ponds. As my second attempt to kill the gnats, the soaking of the bits was a real pain, and leaves a messy granular by-product. After researching, it took a while to figure out a product with the active ingredient of Spinosad. It's an amazing product ( the Monterey Spray) that works really well. It's approved for organic growing use! It's very convenient to mix up a batch. I seem to remember it has a 3 week residual effect. I sprayed the surfaces of the potted up dahlias, then if eggs are laid, the larva encounters that top soil and are killed by ingesting the Spinosad. I hate to use pesticides, but this product is essential.
