Robert A. Krumm, 63, former owner of a plant store in Northern Virginia, died of cancer Dec. 7 at the Mount Vernon Nursing Center, where he had been a patient for about two weeks. He lived in Alexandria.

He had owned the store on U.S. Rte. 1 below Alexandria for a number of years until retiring two years ago. Before that, he had been a salesman with the former R.P. Andrews Paper Co. in Washington.

Mr. Krumm was born in Columbus, Ohio. He attended Capital University in Columbus and Ohio State University. He came to Washington after enlistng in the Army in 1940 and later served in the Pacific during World War II.

He had been a member of the Optimist Club and was active in the Boy Scouts. Magic was his hobby and he performed at various functions here. He was a member of the Virginia Magic Society and the International Brotherhood of Magicians.

Mr Krumm's wife, Betty J., died in 1977.

He is survived by three children, Alexis Noble of Clifton, Va., Ross W., of Charlottesville, and Candace E. Hoover of Waynesboro, Pa.; a brother, Thomas, of Northridge, Calif.; a sister Nancy Fichter of New Richmond, Ohio, and one grandchild.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society.