Yes it works great.It is important to buy rockwool for growing plants.Because it has other properties than mineral wool for building purposes.
http://www.canna-uk.com/characteristics_of_rockwool
Sowing seeds into rock wool
Re: Sowing seeds into rock wool
It is important to use rockwool for growing plants.
http://www.canna-uk.com/characteristics_of_rockwool
http://www.canna-uk.com/characteristics_of_rockwool