We have a new member from Seoul, Korea. He would like to know if anyone knows how to make a suitable rock wool substrate for sedum cultivation, to use in roof gardens.
Lee, this is a good place to post your questions for us. Hopefully we will be able to help you.
Jacki, I know you have some experience with this. Twit you are an awesome researcher also. Is there any one here that has knowledge on the topic?
Here are some sites I have found that talk about using rockwool.
Rockwool: This is a material manufactured from rock minerals, often used in insulation, or as a growing medium in greenhouse crops. The roots of the roof vegetation can penetrate it, and the friction between the rock wool and the bitumen roof makes it lay still in place. Rock wool can hold a lot of water, and release it to the plants over a longer period, but also drains off any excess water.
In very light weight solutions, rockwool is used as a substitute for the substrate, plants grow directly in it, and gravel is sprincled on top to stop the mats from blowing off. This solution doesn`t hold any long term nutrients for the plants, and so has to be fertilized.
http://www.greenroofs.com/Gree...
http://www.greenroof.se/?pid=3...
