They can form at almost any intersection in the leaf stems. If you plant the leaves with some stem it can form a bulblit. The oddest thing I have to say about this is Amorphophallus are aroids and all aroids produce tubers not bulbs. I am not sure why this was ever called bulbifer it should have been called tubeifer. Took me sometime to really tell the difference but a bulb will produce the leaves and flowers inside it. So if you cut open a bulb you can find the future flowers and leaves. But a tuber is just starch and nothing forms inside it is formed as it grows.
Here you can see were they usually form almost always at a stem intersection. I would allow them to form before getting cuttings. I have had very small tubers form all the way out on the far branches. I would think almost any part of the foliage could be rooted and form a tuber. But the larger the better chances you have. I have hear of leaves rooting but in most cases they rot for me.
I'll prolly just wait and do cuttings next year (if at all).
The leaflet tips of the one I took wilted a bit and darkened soon after I put it down.
A little while later, I took it out of the high humidity for a few days and it seemed to stop deteriorating and now I've returned it to the aquarium-incubator. Mine has always been in shade and *may* have gotten a touch of direct broken sunlight, but only very briefly. The two reports I have read on leaf cuttings say to put the cuttings in total dark. I hadn't read that at the time so I didn't do that.
It just doesn't make a lot of sense to me to do that and I don't know that I would have followed that advice or not, if I had known it.
It may be best to do that, I don't know...I'm just experimenting.
bwilliams, the 'red taters' are quite interesting. I've grown one year before last. The plant didn't make any flower, and succumbed to root rot at the end of the season. I dug it up and discovered some bulblets (formed underground). I potted into a hanging basket, and a few days ago it sprouted for me. One of three, anyhow. I'm excited, I was afraid I would lose these unusual plant. I also discovered a seedling came from the same area the original plant was placed, even though the plant was potted in the ground pot and all, a bulblet escaped there somehow. Should I dig these up and overwinter indoor if the soil stay moist during the winter in my zone?
Thanks for any help.