This has rapidly become one of my favorite plants. The leaves of Peperomia 'Hope' are so odd, with virtually no veins but they have the shadow of them inside the leaf - hard to explain, I'll post a picture.
I never saw them in real life before I bought a cutting online, so it was a surprise when the cutting arrived in the mail. It was a cluster of three leaves, with a piece of stem.
Now this is where it gets interesting. There is no way to tell which way is up, without getting out the microscope, and even then it would be hard.
I dutifully planted which end I assumed was down, but after weeks of waiting, I thought to actually put the place where all the leaves attached onto the surface of the soil.
In a few weeks more, presto
chango! New growth emerged from underneath the leaves. And roots
were obviously starting too, as I could no longer pull the cutting out.
This brings me to the point I was trying to make; be sure of the orientation of the cutting. What you might assume is up, is actually down, because of the trailing habit of the plant.
The leaves of Peperomia 'Hope' are all in clusters of three to four, along the stem which shows a distinct trailing habit, unlike other members of the genus. Most other Peperomia are upright, more like a shrub in effect.
If you get a cutting of Peperomia 'Hope' from a friend or online, see if they will mark the side that is up, and then you can plant the other end into the soil. You will soon get roots, not more than a week or so, instead of the months that I waited.
Surprisingly, the cuttings stay in good shape for a long time, so all is not lost. If you had to, you could use the water method of propagation, where you stick the end, or the cluster of leaves, into a jar of water where it will root in full view.
I've now planted three cuttings per pot, to give a nice full container, and I'll put them on descending shelves to make a waterfall effect. They are a fun little plant, and very forgiving of mistakes, or even neglect.