Peat moss pellets work just fine.
If you are going to grow in Hydroponics they wash off the plant with easy and not get any dirt or anything in your reservoir.
You can then plant just the seeding in the grow rocks and not have to worry about Rockwool retaining water and soaking the root ball, or holding nutrients around the root ball.
It will save you Ph problems as well as the chance for toxic salt buildup & nutrient imbalance around the root ball due to excessive water build up.

Rockwool is the #1 grow medium sold at grow stores (so they say). Itâ??s just not my favorite thing to use for the reasons I stated above.
Zandor Reviewed by Zandor on . Help I can't manage to get beyond seedlings!!! Can anyone tell me what im doing wrong and give me some pointers. Three times now ive managed to germinate my seeds in tissue and transplant them into rockwool and once they reach about an inch tall they stop growing and eventually die. The first lot dried out the second lot look like there about to die from OD on nutrients. If I tell you what ive been doing perhaps someone could give me some pointers. Ive Ph balanced about 2 litres of water to 5.6 added about a teaspoon of superthrive. Rating: 5