Hi sorceresslelia, I haven't had any experience in growing them flat or sideways but i guess if you had enough soil in there to cover the bottom it may not be a problem. Also maybe the bag method on top of the heat pad could be an option since it might be more flexible in amount of soil and placement/positioning of the cutting. Also you could root open with just the heat pad and u can stand up right. As long as the cutting gets good amount of sun or from grow lights I think would root ok. During rooting bottom heat would be the main thing to focus on. I place cutting in clear plastic cups with a bunch of holes punched in them and use a heat pad in a plastic storage bin with CFL lights and have rooted a few cuttings in my garage during this winter. I also make sure the soil is damp not soaking before I place the cuttings. I rather be a little on the dry side versus too moist .

I haven't used the egg method but I have thought about it. When I root cuttings, I use a neutral potting soil without any fertilizer like cactus mix and add a bunch of perlite to help with drainage and aeration. Also I wait till the cutting is well calloused to prevent rot (wait 1 to 2 weeks). I'm a newbie to plumies so hopefully you'll get help from more experienced growers. Good luck!

ps. Nice set of cuttings! Hopefully they root and provide awesome blooms down the road. Keep us updated.

-Ryan

I think it would be OK to lay them down temporarily. All the normal rules about watering apply, etc.

I have no experience with the egg method so I'll reserve comment. Except for the fact once you do it you are committed (unless you want to disturb the plant during rooting) and I would not want a rotten egg in the house for the next couple of months.