I want to make the paths through my gardens with a thick layer of coquina, I like the visual interest provided by all the little shells and it seems appropriate for my gardens to use an abundant local material. Also, it will be quite affordable, I've found coquina priced at about 6 dollars per ton.

What I'm worried about is the limestone paths drastically altering my soil's pH, and consequently turning my yard into some kind of alkaline desert. I have a small yard, so I can't sacrifice any land... I want a path material that will allow healthy plants to grow right to the edge. Will coquina be appropriate? Will the lime leech out with rainwater and cause problems as I have suspected? Does anyone have practical experience with coquina garden paths that they'd like to share for my benefit. ;) Thanks in advance for any assistance.