I have a large flower bed where several years ago I planted snapdragons and gladioli bulbs. The snapdragons drop their seeds like crazy and it seems like I'm never going to get rid of all of the new ones that pop up every year. Same for the gladioli bulbs. I've tried to remove all of the large bulbs, but I can't get rid of those small bulbs that seem to multiply every year. I want to do something different with this flower bed. I want something more permanent like some type of shrubs or conifers that will also be pretty much maintainance free, but I know that snapdragons and gladiolis are going to pop up everywhere after I've planted whatever I've chosen. What should I do, line the flower bed with layers of newspaper first or something like that? Will that take care of these little shoots for good? What I want is a "clean" flowerbed to start with this spring. Please give me some advice. Thank you.