If you visit the
Library of Organic Information and the Guides you'll find lots of specialized programs that deal with roses.
Here is the
Roses Organic Program. Roses grew and thrived long before the chemical companies came along and suggested different means. You can compete against toxic chemicals, and your yard will be a much happier space.l Another tip not listed there, I hear people talk about getting used coffee grounds (from places like Starbucks) and sprinkling them under the roses they'll be very happy.