I have no experience with Haydite.

I would ask, does Haydite allow plants to grow thru it?

If you study geology, you will find some of the most lush and fertile grounds are on land formed from recent lava flows.

In many islands, you can have palm trees that grew right up and out of lava rock or magma. Amazing how righ the stuff is.

And hold the lime for now. Keep it simple.