I picked up a battery-powered sprayer attachment at Home Depot that uses
the same 18-volt Ryobi battery packs as my trimmer. It works great, and
it's really nice not to have to do the pumping thing, especially in this
weather. It holds about a gallon, which is plenty for the few rosebushes
I have in the front yard.

MAC

http://www.oneplustools.com/outdoor/p2400