Rock wool

Subject: Rock wool

> A question came up at our Aquatic Plant meeting the other night.
> using "rock wool" around plant roots. I remember reading bad thi
> it. Can someone refresh my memory about why it's not good to use
> why it is good, if it is? Thanks.

IMO, if your substrate is set up properly, you don't need 
rockwool.  OTOH, as long as it has not been impregnated with 
chemicals, I doubt there's any particular harm in it.

Karen Randall
Aquatic Gardeners Assoc.
Boston, MA