Does anyone out there have experience with using a pre-emergent (Preen is the only one I know of) on bulb beds. I realize that I would lose self-seedings of galanthus, crocus, eranthis etc. but the weeds have really gotten out of control. Any help appreciated, Dell -- Dell Sherk, SE PA US Zone 6. Amaryllids, South Americans, Cyrtanthus, Hardy bulbs, cactus and succulents, and, after a lapse, gesneriads.