Rock wool question....just add water OR water with nutrients

[GpsFrontier]

If the seeds haven't sprouted yet they don't need any nutrients. It's a waste to use them at this point but wouldn't hurt anything. A couple of days after they sprout I would start using a very diluted nutrient. Something like 10% to 25% of the full strength nutrient solution.

[firedirt]

I have not have had the greatest luck with rock wool but when I was I just used straight water till they sprouted. I have found that using agro max starter plugs work great usually have the seeds sprout in about 24-36 hours with a heat mat under the starter container with a high humidity dome.