What kind of gravel do you get in Hawaii? Here we have crushed limestone, but I'm thinking not in "your neck of the woods." Thank you for the pics, it was like taking a walk thru paradise to see them. We're enduring very hot and dry weather here. Tradescantia (my very correct brother-in-law used to call them "Wandering Hebrews"...he thought "Jew" might be taken the wrong way). Only know of two varieties here: purple stripes and white stripes. I covet the white striped one my friend has and plan to steal a cutting when she is not looking.

We get crushed lava rock, not the fresh hot kind. There is a quarry on the island. Comes in all sizes. I use 3/4 inch but you can get all sizes up to 2 man rocks for rock walls. As the island was made of lava flows we all live on it. Where we live the last lava flow as many hundreds of years ago so we have 6 ft of soil and cannot find a rock. A mile from here homes are built on more recent flows and they have no soil. They have to get huge rock crushing bulldozers in to level their lots before building a house and then haul in top soil and mulch to start a garden. When putting up fencing I can pound a metal fence post in in 10 seconds. Those poor folks on rock need a jack hammer to make a post hole. There, now you have something to bring up at your next cocktail party.

Thanks for clarifying! I envy you your deep soil. I have heavy clay over fractured limestone rock. In spots, the rock comes right up out of the surface, in other places the soil is fairly deep but you do come up against the occasional fragment of limestone. One interesting thing is that in some spots you can find clay-shale, which is sort of clay in the process of becoming rock. Sometimes this turns up a fossil (usually a little leaf or something; no T. Rex here...)