I've never water rooted plumies so I don't know how brittle the roots might be. Even soil rooted plumies have fragile roots. When I transplant newly rooted cuttings I tap the soil down instead of packing it. I don't use cactus soil but that's probably a good choice. I fill the pot partway up with potting mix, set the plant in and pour soil around the roots. Every few cups I bang the bottom of the pot on the ground to make it settle. I overfill it with potting mix and the soil level goes down when I water it in. If it's wobbly I'll stake it.
Karyn

I think Karyn has it right! I had one in water for about 3 months (bad me)! Just plant it about 3 to 4 inches and put the soil around it. Don't pack it down, water it in and it should be good to go!

You could start adding perlite to the water a little at a time. Maybe 1/3 of the container. This would displace the water so that the roots "learn" to survive in a dryer environment. The roots of water rooted cuttings are VERY, VERY fragile and the slightest pressure can tear them off. Then you are back where you started from with an unrooted cutting.
HTH
Andi

Thanks for the advice. I will be very very careful.
Lauri

Karyn how often you were watering or refreshing the water of the cuttings that were growing in water?
Thank you.

My water rooting didn't go too well but that could have been what I started with. I'd had a 4 tip branch that broke very close to where the multple tips split so there was very little stem to work with. I tried soil but that didn't go well so I cut apart the individual tips and put them in water. The ends got mushy but the cutting was kind of pathetic to start with by the time I decided to put it in water. I ended up tossing the cuttings, or so I thought. I just got back in town and took a look at my plants. I found a plastic cup of water that I must have thrown a very tiny (3")cutting in by accident. It had been pretty much submerged on it's side for the past couple week and has little root nubs forming along one side of the cutting! I'm not sure what to do with it so I tossed it back in the cup. lol If the roots continue to develop maybe I'll plant it on it's side in some soil. Stemn to answer your question about changing water I usually use an air stone when I'm rooting cuttings. The bubbles keep the water from becoming stagnant. If you don't use some type of aeration I'd change the water every 3 days.
Karyn

Karyn, What is air stone?? :) lol.. my english...
is a special stuff? mama mia.. instead of dancing or drinking somewhere we are talking about 2-3 inches of plant and how to make it growing.. is that normal? for us the Greeks not! but, still, I want to save a small cutting and I don't know what to do with it. That's why I was thinking of putting it in water. In the other hand I am afraid of fungus etc.. so I put on it some bordaeux mixture and now the critical desition.. what to do? where should I put it? in soil or in water? these air stones are they breaking heads?? lol.
Here we are:

Isn't it terrible how we obsess over these sticks! An air stone is used in an aquarium. It's a little thing that you hook up to a pump that produces bubbles. Can I ask what is that blue stuff on the base of your cutting? You don't want to seal the base of cuttings that you are attempting to root, just the exposed branches on a plant or the top of a mid stem cutting. If you are going to root it in soil I'd dip it in rooting powder, if it's going in water don't bother. I'm not a big advocate of water rooting cuttings but that's just because I haven't had much luck. Others have done very well using that method. I attached a link with photos of different air stones so you know what I'm talking about. I'm sure you've seen them in home aquariums.

Here is a link that might be useful: air stones

Ohh yes, I know now and I have seen these bubbles in aquariums. The blue stuff in the bottom is Bordeaux mixture against fungus and all the rest.. It is an antiseptic anyway and it helps I think. If not we 'll see it in the near future:-)
Now I wll put it in soil and if this little baby wants to grow ok, if not, ok again!;-)
Many many thanks for your time and I wish you all the best with your plumies.

Hi stemn: Looks like you've covered up the rooting end of your cutting with that Bordeaux mix. I suggest you remove it in order to encourage rooting. You might try taking a very thin slice off the bottom to expose the growth tissue. Like Karyn, I don't have good luck rooting Plumeria in water. Hope it works for you. Good Luck, Gloria

Will the Bordeaux mix decompose in the soil? I was asking because it looks like a latex sealant. If it breaks down it's probably fine to leave it be but if it doesn't you might want to take Gloria's advice and recut the end. If you have to remove it allow the cut end to dry for about a week and dip it in rooting powder before potting it. Good luck.
Karyn