I bought 2 Plumeria cutting with a lenght of about 10 cm (aprox. 4 inch)

I first tried to plant in a combination of coconut fibre and lava gravel. I checked the cuttings since they apeared to be too wet and there were little transparent worms in the gravel. I took the cuttings out, washed them an replanted in 100% perlite.
After 2 weeks in perlite, I carefully checked the cuttings' ends and they look like in the pictures. As I am new to this, I really don't know if the cuttings look good or if they are starting to rot (it seems to me they are not doing too well).

What should I do? Should I cut them and let them dry again and replant?

Idybrd

You have a few things going against you.
Those cuttings are very green.
They are quite short
And it's a bad time of year to attempt rooting. The plumeria are dormant this time of year.

If these were mine, I would first wash the ends with H2O2, then put them in a dry, frost free place, for a few weeks upright in perlite. DO NOT WATER AT ALL. Bottom heat will help but not a lot of heat or it can cook those stubby cuttings....

Good luck!

I would do everything Hetty said except the bottom heat. That will encourage growth and this time of year, its not happening. You need to get those puppies through to spring - the only reason they are still alive is the stored energy in those stems. Don't let them waste any more of it.

One of them appears to be rotting. I would cut the rot off (you will know when that is by the color of the inside of the stem) and lay what's left out in a shady spot to scab over. A little cinnamon on the cut end might help.

We go to Hawaii every December and I used to buy those Plumeria cuttings in the bags. They always died. I don't think I am that bad a gardener but trying to root something out of season is not easy. Finally, I got hold of some seeds (that means smuggled in my pocket) and grew a tree that way. It lasted many years (and bloomed) in a huge pot (that I wheeled into the barn every winter). It met its demise the year we had a week of 11 to 32 degree days.

That was also the year my daughter's coconut palm died and it was in the house! I was actually thankful for that - the first two leaves were each 8 feet long. Our living room was suddenly so much smaller!

Daisy makes a good point; right now all the cuttings need is rest....

with Hetty and Daisy. Not the best timing to root them, best to let them rest. Hopefully, even it is so short, it will try in mid to late Spring to root, but it will be a real challenge for sure.

Thank your very much for the advice. I just washed the ends with H2O2 and put the cuttings in perlite (away from heating, but in a place with temperatures between 17 and 21 degrees Celsius). Hopefully they will survive.
It's good to know next time I buy a cutting it should be longer or already rooted .

Daisy, I am sorry to hear about your plants. Hopefully the next Plumeria planted will last even more years.