Bleachers were common in gardens 2-3 decades ago. Now? Not so much. Cinder blocks with 2" x 6" boards were typical. Pure, undiluted salvage also. Too stark? Stain your bleachers a faded green ,or some such color, from Benjamin Moore or Farrow & Ball.
Garden & Be Well XO Tara
These bleachers, above, are perfection. Terra cotta theme, vines, and resplendent rain butt. Lotta lush in teeny/tiny space. Found pic via WSJ Magazine.