I know this is an old thread but I wanted to update what I did over time to get "rid" of the lava rock problem that we had. This last week, I finally scraped alot of the remaining rock out of the large bed and spaded topsoil, compost and some organic fertilizer into the soil. However quite a bit of the lava rock remained and I spaded that in along with the amendments. I simply could not get all the rocks out with a flat type of coal shovel. I double dug the areas adding amendments each time along with organic fertilzer, soy pellets, etc. (Not alot of fertilizer but a sprinkling to get things cooking along with the compost in there.) Of course this was heavy, sweaty work but it is finally finished off. I wish I had been able to get almost all of the lava rock out of there but too much of it had already been mixed in with soil over the years and I simply couldn't get it all out without removing ALOT of the soil along with it. But I was able to spade the vast majority of it back into the amended soil before adding a final layer of topsoil, compost, soy pellets and wood mulch. (In the end I probably added back 4 inches of amendments to make up for the removed lava rock and put another 3 inches of wood mulch on top of all of that.) So now most of the remaining lava rock has finally been worked into the soil where it can hopefully decompose more quickly and become part of the soil. I NEVER recommend lava rock or landscape fabric to anyone but if you move into a house that has them you can probably get away with leaving some to dig into the soil. I say this because after all the amendments and digging in of the remaining lava rock (which was still a fair amount of lava rock) the final "soil" drains well. (But it took ALOT of work that wouldn't have been necessary if I had never had the lava rock in the first place.) The plantings are doing very well but I'll know more this summer when the wife plants flowers into this newly amended soil with some lava rock spaded in. Time will tell. In the end though, I WILL NEVER use lava rock or weed barrier fabric on my garden ever again. These were the two biggest mistakes I have ever made in all my years of gardening. Just my personal opinion. (The reason I got rid of mine and/or incorporated the remaining lava rock into the soil was it had become unsightly over time and some parts stayed too damp and a small bit of moss was growing on some of them. This situation had to be corrected because it was really bugging me. LOL!) Finally, I was surprised to find quite a few earthworms in this old "lava rock" soil when spading in all the new stuff. That did really surprise me, I didn't expect to see earthworms in this old stuff. Now the earthworms have a good soil to live in!! (I hope!!)

We have continued to mulch with finely - not coarse - pine bark mulch. At least I think that is what it's called. It is what is sold by garden centers in our area. My DH buys pick up truck loads of it every summer. We tried buying bags but we needed too many bags and I think it was more expensive that way. We are not changing what we use as mulch. The termites are gone now. According to the person who treated around our house, termites in our area need moisture. Without moisture they die. My original question was not for me - I'm not changing my mulch for anything else. It was for conversation purposes that I was going to use to talk to my neighbor. Too late on that front though - a couple of days ago a truck came and delivered 3 ton of large red stone - not lava rock but larger stone. I've never seen anything like it before. She and her DH had it all spread by that evening. So now, I'm just enjoying the conversation going on here in this thread! Linda PS Thank you for the name of company who bags the Super Fines Soil Conditioner. I will look them up and see where they distribute.

Don't use fabric. And don't use rocks. I would use only mulch- it degrades and nourishes the earth, it keeps moisture in the soil, and helps keep roots cool. Plus when you refresh it every year or so it makes everything look all new again. Rocks, once put down, are forever and someday somehow you will want them gone and be unable to gather them all up. You'll be forced to hire neighborhood kids for a penny a rock. They just become unsightly and bake everything underneath. As far as the fabric there are varying viewpoints but I do not find that it suppresses weeds all that well (birds still drop seeds that germinate on top) and there is evidence that it disrupts gas exchange and beneficial soil organisms. Roots need air.

If you google "stone mulch" or "decorative stone mulch", you can find some different options for stone groundcover that can look like mulch on first glance (in color and shape). This might be a good compromise-- a natural look with the advantage of stone. However, it's MUCH more expensive up front than a wood mulch would be. Not endorsing the below link but they had a lot of first-page hits for the above google search. Here is a link that might be useful: Some vendor of mulch-like rock products