Yes you can, Banana peels are a good source of potassium for the soils and root uptake by the roses. I cut the peels or even the entire banana up into 1/2" or less thickness or widths. Scratch back some of the soils at the base of the rosebush and place two or three of the cutup bananas or peels there. Cover up with the soils, water lightly and let nature take its course.
Answered on October 15, 2016
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