new tree stump

My Canadian Crabapple tree was just cut down yesterday. It was in the 3 foot border bed along my backyard back fence. The stump is small, about 5 or 6 inches diameter, but there are *lots* of nuisance suckers all over my beds and into my lawn. How long should I wait before starting stump and root removal. I think I'd like to try the Epsom Salts method. Can I start right away or is it better to wait for some period of time?