Perhaps spreading crushed red pepper, chili pepper, hot paprika or other spicy seasoning throughout the mulch will stem the behavior? Also works well to keep animals from encroaching on lawns. The stinging of the animals senses alerts them to the fact that the area is no longer animal friendly without injuring/harming the animal. Spices can be purchased at the dollar stores in large quantity for a minimum price. It's a small investment to find out if it works.
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Not sure if I have free time...or if I just forgot everything I was supposed to do!
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