Rockwool. Dont just throw seed in there though. They need the proper ph before the seeds go in there.

Watch a few videos on it.

Ron

Here is a link that might be useful: how to prepare

Thanks I'll watch it, I was reading about germinating seeds and it said soilless was the best. I didn't know what was soilless.
Randal

Most peat based potting mix is soil-less.
I use ProMix. Always had good luck . You can use rockwool cubes if you want just soak them in a mild bloom mix fert. and put a little vermiculite in the hole on top to acomidate the seed. Rockwool is PH neutral so there should not be a problem there but I think it might be easier to just use a peat based medium. Im sure Rockwool would be very effective though. Im not sure about a fertilization program due to the fact rockwool washes out faster.
I use it to root cuttings from many perennials and swear by it for that but use Promix for all my seedlings. 96 cubes to a flat does give you a compact aria to start plants so Rockwool might have some advantages.

Soil less medium does not contain : Garden soil, compost, and manure. It is mostly consist of peat moss, pine bark, coconut coir and perlite. Because of that you cannot use organic fertilizers which require bacteria to break it down and make the nutrients available to plants. I make and use 5-1-1 mix which is made of pine bark, peat moss and perlite and I use synthetic fertilizer that also has Mg and Ca among other trace elements.

Seysonn