Well, first of all: woo-hoo!

Second: I'm not 100% clear on the situation. If it rooted horizontally, then buds for leaves should have formed along whatever side was up (though when I did mine, each cane also had one that was just right at the soil line -- those ones didn't wind up surviving, though), on whatever parts of the cane were exposed to light. If it was underground, it probably should have stayed there, and yes, white bumps do make me think of roots. I dunno. How long ago did you start these? Is a picture possible?

I suspect that the plant would forgive you if you put it back.

Hi Mr. Sub
These white nubbies were along the soil line, some below.
I was thinking that they might be the start of new growth and they just haven't grown upwards to the light yet.
I don't think all the nodes were all along the top when I planted it.
I"ll try and figure out out how to post a picture on the site today, hopefully I can have a better explanation and you can help me out.
Thanks for the support/congrats. I'm always excited when I can root something successful that could be quite difficult.

Sherry

Well, I looked at the pictures in the other post, and while I'm not 100% sure, I'm inclined to think that the white bits are trying to be roots, not shoots. If memory serves, when I did mine, the new shoots always started out green.

No real way to know for sure except to grow it out and see whether they grow upward or downward: whatever they are, they don't seem to be hurting anything, and you've got one plant out of it more or less for sure.

Thanks. I now have it potted horizontally, with most the stalk covered since these are probably roots. My concern is that the whole stalk rots.
Will it eventually grow a vertical trunk like yuccas have?

Thanks Mr. Sub.
Sherry

Each of the sprouts, however many there eventually are, will form a separate new stalk. The cane will grow roots into the soil from some other spot, and then eventually the parent cane will hollow itself out, except for whatever material needs to be there to connect the roots to the shoots, which is a pretty cool trick. That is, all this will happen if you leave it on the soil long enough.* Then you can just pull the remains of the original cane away from the new growth and pot them up.

There are probably ways to get more individual plants out of the process than I have (I had two 4- or 5-inch lengths of cane in a 6-inch pot, and got three plants in the end): I'd guess that separating the cane into smaller pieces once sprouts have begun to form would lead to each smaller piece becoming a new plant. However, I hesitate to recommend this because, you know, it's not like Yucca canes are just falling off of trucks, and there's also a chance that making new cuts would cause some of the pieces to rot, defeating the purpose. Also with that piece of cane you probably couldn't split it up into more than three pieces anyway.

I wouldn't be overly worried about the cane rotting if you leave it alone; it's possible, but it's not terribly likely to rot if the cane is half out of the soil and has already sprouted leaves.

*(When I did mine, I had left the canes potted up together because doing so didn't seem to be hurting anything, and the three sprouts together gave a pleasingly bushy look. I don't know at what point I could have divided them, only that it had been not quite a year by the time I actually did.)

Thanks once again Mr. Sub.
I've decided to leave it in the soil, horizontally.
It's about a 5" piece which I potted into a 6" pot. Half the stalk is exposed. I am hoping that these roots really are shoots and I'll end up with a nice bushy yucca.
That is the whole tasteful look of a yucca; several different heights in one pot.

Now that I know how to post pictures; provided I can remember next time, I'll keep you posted as to the progress of my yucca baby. I LOVE houseplants!

Sherry