> Let the surface of your pots dry out to prevent > infestation. There are multiple advantages to letting pot tops dry out. For the gnats though, I use a BT product (Bacillis thurgensis may be spelled wrong). Comes in small bottles at many retail garden stores. Takes time to build up the living anti-gnat population of BT critters. Then they attack the larva under the soil. Works great for me. Just dilute and pour on soil. Water it in a bit. Once they are established, just treat new soil or pots you bring in if you want them to be protected. The stuff probably kills all butterfly and moth larva. I'd be careful not to get it on the leaves of plants eaten by larva you love. May not be active outside the soil though. Happy "Spring" for those on the North part o' the planet, KellyO Kelly O'Neill http://www.bigbubblers.com/ and Big Bubble Magic(tm) at http://www.wetrock.com/ and Wet Rock Gardens Flower Farm 2877 N 19th Street - Springfield, Oregon 97477 U-Pick and more at the farm (open 9 to 6, Sun, Wed and Fri - from March thru Halloween) kellyo@wetrock.com - http://www.wetrock.com/