I used them to start my current grow. I was actually kind of pissed at first since I wanted rockwool but the hydro store was out of it and I had to "settle" for the Rapid Rooters...only to find out that several other growers have raved about them lol.

What I did was to soak the plug in distilled water for about an hour to be sure it was completely hydrated. Then I dropped a seed down the precut hole. The precut hole is big enough that the seed is still exposed to light and air so I pinched off a small piece of plug from the edge and placed it down the hole on top of the seed. The plugs were placed in the tray and covered with a dome. I didn't use any extra heat, but then again the closet they were in averages about 84.

The first seeds sprouted two days after I "planted" them. The last ones sprouted two days later. Out of 10 seeds started, 9 germinated and the 10th one went MIA. I opened the plug after about a week and there was no seed in it. I'm thinking I somehow missed the hole on that plug and the seed ended up on the floor or something lol.