Re: My project
I think the 1/4 inch gravel is a good choice given what's underneath. Composted horse manure would be better than steer, but availability might be a issue for you. Be careful with uncured pine bark, it has a pH near 3. Mixing potash (or just ashes from real wood) directly with the pine bark is one way to buffer it. I would start with no more than a gallon per plat.
I'm jealous. You are at least 4 months ahead of me in your plat construction.
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