Michele! That's so much better than I had pictured, and I really love the idea for myself! Thanks so much for the additional details!
I've called Glover Nursery, and they've never had fine pine bark. I've got a nursery much closer than they are that sells the same stuff, and they've never had it either. I can get some pretty fine mulch, which I use for amending the soil, but it's probably not all pine. It's just a huge mixture of trees, but it's great mulch, and also great for mixing in to improve the dirt. I buy at least two truck loads a year. I've just never seen anyone mention using fine mixed mulch. It's always fine pine bark/mulch. Any idea if a mixture would work the same? I can buy a yard for $20, and it's always closer to 2 yards once they dump it in my truck. Feels like 4 yards after I've unloaded and moved it!