I hate rotting bug infested wooden mulch so much I am looking at rubberific mulch, rwhcih is recycled dyed tire treads. I thought why not make my mulch beds semi -permanent and use these rubber bark chips instead. At 14.99 a bag it' not cheap. But over time I would recoup my investment and would not have to re-bed twice a year which I dread. I know there would be no nutrient breakdown, but I could always add some miracle grow. Anybody done this and are you satisfied?