Use of Roundup
Jane McGary (Thu, 01 Oct 2009 16:47:01 PDT)

I have seen no ill effects from using Roundup over completely dormant
bulbs. In fact, last year I had to get rid of a very invasive
subshrub (Rosa sp.) and I used Crossbow on it over dormant bulbs with
no apparent damage. However, before I sprayed the Crossbow, I covered
the sites of the bulbs (colchicums, mostly) with a thick layer of
bark mulch, which I later removed.

Jane McGary
Northwestern Oregon, USA