I used towel and rockwool plugs. Paper towel was fast, but the problem is when transplanting, it is easy to damage the taproot. I suggest to put the seeds directly to PH5.5 rockwool plugs. It's easy and foolproof, just follow many of the manuals on the internet.
like Vostex said 'careful not to damage the roots'
Roots have a tendency to grow right into the paper towel, so when you transfer them, ie take them off/out of the towel the roots get caught and break. very sad
not sure why you'd put the seedling into rockwool, then soil, when you can go straight into soil, it works but slows the initial growth, as the roots have to adjust.
I do like Granger, 'soak-m for 24 hours' then I place them in a prewetted lightly packed cocomix cup, place-m in a tray under a some low watt cfl's, and in a few days their up.
Any of the methods posted here I'm sure work fine. It's pretty hard to argue with just making a hole in moist dirt and throwing in the seed, provided the soil is kept reasonably warm. I just seem to be in the group that has to see a tail pop out before burial. For that reason and because I have very good results, I use a baby wipe warmer. Low heat level and humidity is easy to control in the closed chamber. I lay sponges on a plastic grate that sets just above small amount of water. Cheap and works great for me.
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Keif