When you say seedlings grown together in same pot, but as separate plants?
This is not an issue unless they are from different parentage and you want to document growth/flower etc. when old enough.
If you speak of conjoined seedlings? I would emagine it may depend on whether they where from the same seed embryo and then it would be anyone's quess.
Caudex size is not guaranteed. Arabicums will give larger caudex growth.

None of the above are guarantees and with these Adeniums, that is what is truly what makes it a see what you get. I am still waiting to see what my young plants will give for blooms. As for caudex size, they all vary in many ways.
Hope this helps somewhat.
Enjoy growing them.
Rick

Sorry! I wasn't clear, I've been wondering about this so much, I had tunnel vision. yes, I meant growing two unrelated seedlings together until they are conjoined. The concept of grafting made me wonder about them growing and joining. I also bought some seedlings and a second, newer sprout is emerging in a couple of containers. I think either they will grow together or perhaps the newly emerged seedling will not make it.

Thanks for your input!

I guess to have 2 or more plants conjoined you will have to scrape/cut the caudex skin where they meet so they can fuse. Interesting thought. One might get a "giant" caudex this way. W/o human intervention I'm not sure they will fuse.
Kirk, have you ever tried this?

This post was edited by otis11 on Wed, Aug 14, 13 at 14:14

I haven't tried to grow two together as of yet. Nor have I been lucky enough to have conjoined twins from one seed. I have been thinking of making two older seedlings grow together though.

Kirk

I have a lot of seeds sprouting at the moment. (1 week old). When they're a bit older and not so tender to be handled, I might do that. At what age would you suggest?

Hey, I just noticed this post.

I have actually done this very same thing to several of my 4-month old seedlings that I just repotted (see below). You can't tell from the way they are separate above the soil but underneath, the seedlings are perched on two lava rocks roughly 2 inches wide. Their roots are tangled in such a way that the taproots will have room to grow around each other.

To hold up the seedlings while I worked on the roots and the lava rocks, they were arranged and kept in position using three vice grips lol.

Spooky action from a small distance, har har. Frankly, I just didn't want to have to babysit so many pots in the winter so I am growing at least 7 seedlings in this manner. I might actually do this to my even older seedlings.

I don't expect their caudices to fuse. But I think wounding a mature caudex and ducktaping it to another is a brilliant idea. Maybe you can even chop a whole section off the caudex depending on how you want to fuse two plants together. From what I saw Kirk do, his grafted cuttings literally sent out roots into the stock plant which I thought was amazing.

Hmm...I am now eyeing my mature plants with nefarious intent. It's probably too late in the year to be experimenting so radically. Next spring....

Pagan

P.S. These are seedlings of the same obesum variety.

P.P.S It's entirely possible ducktape is not the best material to use.

Pagan: if you have grow lights, I don't think you will be limited to spring. I wouldn't use duct tape, maybe the kind of tape that doesn't have adhesive to it. Never know what it will do when absorbed by the plants. But again, who knows, maybe it will even help to fuse. All these modern products is just confusing, never know what to expect, lol.

PS: if you conjoin different hybrids, you'll have different flowers (if it's not rejected). Just a thought.

This post was edited by otis11 on Fri, Aug 16, 13 at 15:15