I bought an 8 pack of stargazer lilys at Lowes, and I just looked at them and noticed that one (at least) has a little green mold on it. Should I take the whole pack back, or should I just plant the ones that don't have visible mold and toss the moldy one?

Also, I just tore out an old bush from a section of my garden and wanted to plant some glad bulbs there, but the spidery little roots from the bush are EVERYWHERE. Should I just plant the bulbs in with the old roots (they will probably just rot away right?) or do I need to somehow get them all out?

I am new to all of this, so some advise would be much appreciated! Thanks :)