I make sure to get a node buried, or else it won't root. One node above soil level, and one beneath. Look closely, and you will see the roots beginning at the buried node.
I admit that I do make tiny clones with only 2 nodes total. I'm Scottish. I root several per yogurt cup, though yogurt cups are only 3/4 of a cup (I blame Dannon). I want to get as many as I can get out of one plant's branch. Usually I get one central/terminal growth clone and the two lateral branches on each side, into each 'cup', for a total of 3 cuttings per cup. Occasionally, one will begin to rot, and I can pluck it out and save the other 1 or 2 clones in the cup. Fuzzy mold can appear quickly so its a good idea to check them periodically.
I am preparing a comprehensive tutorial on cloning, using a translucent plastic filing box to house 15 cups with ~ 45 clones, but I ran into technical problems uploading it. I'll try again later, so keep watching for it here.
There are many ways to skin a cat, or clone a plant, and this is only my technique. There are many others. YMMV.
Greenhouses are useless in the summer... in Florida, but in the winter season, they are great for tropical plants...
I hope to fill my greenhouse with clones this winter, and plant 40~50 gallon sized kratom bushes by the lake next summer. Hopefully a future kratom plantation? Dream big.
(These will be for my personal use and consumption. ) lol