Sorry, roses are outdoor plants. One that is grown indoors, with or without air conditioning, is doomed to fail. You could set up a garden outside her window, either at home or if it's a ground floor office, then there.

The little pots of roses that you can get at the grocery store usually just last the one bloom cycle, and then are tossed in the dumpster, but they can be transplanted outdoors if the weather and other conditions are right, once they finish that first bloom cycle. But they will never hit a second bloom cycle if you try to keep them indoors.

Kathy

To the vast majority of plants, most definitely including roses, our offices are basically nothing but dark deserts. That's why you only see the same small handful of species in offices over & over again.

There just aren't very many plants that can stand to grow in that sort of environment.

Before I retired I tried to maintain a potted miniature rose at my desk in an air conditioned office with overhead florescent lights that were on 19 hours a day. I had to bring a new one in every week. I raised them at home and recycled them as they bloomed.
The attempt was a failure. White flies, yellowing leaves and overall vigor was a constant problem. The humidity in an air conditioned office is very dry and the tiny plant required constant watering.
Like Kathy and York Rose said, they won't stand up to that environment.
Why not give her a rose in a bud vase and replace it as needed?

I don't care how much you love the girl, this is a lousy idea. Get her a half dozen reds from the florist and be done with it, or perhaps a couple of silk roses for the desk, but live roses in pots indoors? Nada, not smart.

Or a beautiful print, postcard, or calendar... or a gift certificate! Or research a variety that will do well in your zone, go to the nursery together, and plant it for her at her house. Make sure it does well in your zone so you want have a dead or diseased rose reminding her of you!

Attesting and confirming to the majority who say the rose in an ofice is just not a good idea. None of us want to break your heart and some try to understand your feelings. If it has to be a rose then select a nice clear color of reasonable size I think gold foilage would fit for this situation.

I have been wrong a few times but I think these ones are found only as 1)bands..... are already 2)fully grown.......... have very accruate 3)ratings......are always 4) beautiful...... no matter what the size, last but not least it will always be her............ 5)best friend.
Seeming as we do want to be supportive here comes anouther suggestion.
After the weeding try to keep a few of one of them to use as a cutting... then we can help you propergate em into plants in the right.......... 6)settings.

Here is a link that might be useful: click here for one last hint

Obviously I'm only expressing my own opinion, but it seems to me in affairs of the heart the best way to go about things is to find out what the adored loves, and if your own heart is set upon finding a plant that matches those loves, it behooves you to find something that closely relates to the loves of the adored.

If that juncture happens to be certain roses, it seems to me the best way to express your adoration is either to send flowers, or to plant an appropriate rose outside, where it will be happy and bloom of its own accord.

It seems to me that sending a plant (rose in a pot) that in an office environment will be unhappy, and then die, is not the best way to express one's love for another.

I think IT could be done, but not without out alot of work, IE

1. Keep a Architectural lamp no more than 5-6 inches away , have it on all the time shes there.

2. HAve a coold mist humifider on and filled during office hourse.

3. Under the potted mini rose, fill the water catch container with gravel to add humidity.

4. Offer a bottle of liquid Seven as well...

As you can see, yes YOU might be able to do this.. but it would be ALOT of work on her part JUST to keep it alive,

Ive seen people grow minis in a windowsill for a few years.. They are not going to look great though.

Silverkelt