I hadn't even heard of rubber mulch.. go figure! But I have heard of plasticulture. I see a lot of advice for mulching with straw but not everyone has access to cheap or sustainable organic straw. So I am looking for ways to use what I have! In a previous garden I didn't have much grass or extra space so I grew as much veggies as possible in ever square inch that I could manage and did a lot of chop and drop for mulch and brought in lots of leaves from friends yards like @nateonsteemit is doing!