Certainly, cornmeal won't harm your roses, so trying the method might be worth experimenting with. If that's you, first, you'll need to source whole-ground cornmeal, sometimes called coarse-ground ...

Adams (no relation) Corn Meal (Sylvan Grove/Dothan 1950) and J.T. Pollard Extra-fine Old Fashion Ground White Corn Meal (Hartford 1962) are bagged/shelved for adoption daily. Somebody said he’d ...