rose cutting turned all black?

I got one rose cutting which i planted in the soil, it grew some green leaves. and today i just noticed that, it is dead, the whole stem turned black, not the typical dead brown color.

so i wonder what happened to it? maybe it got some kind of disease?

I'd find the nearest plant disease diagnostic center at a leading university that has a program in plant science and mail the cutting to them and have them determine if a disease was involved. You have left out critical information that would be necessary to determine "what happened to it," and all the speculation in the world will never narrow down the cause. Have you ever thought of taking some classes in horticulture rather than posting vague questions such as this on Dave's? You might get some satisfaction out of learning how to diagnose different types of problems.

There are lots of possibilities of course, but my first question would be whether it could have been kept too wet and rotted, that's a fairly common thing that can go wrong with cuttings.

I am an amateur, i don't plan to become a rose expert.

every other plant around this rose are still growing well. as i mentioned in another post about the micracle grow's "quick start" solution, i may have poured a little solution around this rose cutting, but i am not very sure. this site has a lot of people who know a lot of things, so i figured why not.

It was growing so well, it had at least 5 new leaves, now i have to get another cutting.

I believe I'd stay away from this "quick start" stuff. Cuttings don't need any type of fertilizer. They can't absorb it anyway. Reading labels on products can provide a good bit of information about how to use them. A lot of people start cuttings in containers so they have more control over watering, light requirements and this kind of thing. Best wishes on your new hobby.

It isn't unusual for rose cuttings to turn black like this...
growing in a container is probably a good way to start them off.
You can give them a bit more TLC that way.
Moist, sandy, well drained mix & using a hormone rooting powder on the cutting could tip the balance in your favour.
Sometimes it is trial & error until you find what works for you.
I am lucky with rose cuttings but I do put in a heap of them to ensure at least one or two survive...
now I have to find new homes for most of them as I have loads of the same ones & not much garden space to fit them in.
good luck

Hi Youngman, sorry your cutting died on you, I think the things that Ecrane mentioned about watering etc would be some of the problem, also quick start is really for plants that already have roots, this gives them a boost to grow more roots faster. Rooting Hormone would be better for hard wood cuttings as it is also a fungicide that helps prevent diseases get to the open wound of the new cuttings.
I think your main problem has been the time of year you tried to root your cutting, in your climate, you would be better trying the next time over the cooler winter months or very early spring, this cooler period will be less stressful to the cutting, hard wood cuttings take longer to grow roots than say perennial plants as the cuttings have much softer/fleshier stems, roses have a harder stem therefore need longer in the soil before roots grow. For rose cuttings I would look for stems about a foot long, remove all the foliage and thorns from this with the exception of about the top 2 sets of leaves, make a slit in the soil with your spade and rock the spade back and forth, then place the cutting into this slit, make sure you have most of the bare stem into this slit, you only need about 4/5 inches out of the soil, the rest is under the soil, water the cuttings well and leave them alone till you think the soil is dry and re-water again, it will take maybe a few months even longer for the roots to grow, just make sure to foliage on the top of the cutting is healthy and it should work, as Dalfyer above said, they are quite easy to root IF you do it at the right time of year. hope this helps you out for the next tey at it. good luck. WeeNel.