I'm very new to plant care. A few months ago I got a lovely Dracaena Marginata. For the first couple of months it was happy and healthy. Then suddenly the leaves started yellowing and drooping. (I suspect this was right around the time I figured out how to save a Croton that I'd been underwatering by giving it more water, so I probably started to water this one too much then.)
It's been downhill ever since. About a week and a half ago, I tried to rescue it by repotting it. But I think I did something stupid. The roots were not black, but they were kind of khaki beige and moist, and they circled around the rootball, conforming to the shape of the pot. Having read about trimming rootbound plants, I cut off the long roots that wound around the exterior. (Of course, I later read that the Marginata LIKES to be rootbound.) I repotted into a similar diameter pot, though it tapers down at the bottom, so it's actually smaller a bit than the original nursery planter. But perhaps since I cut off so many roots (less than 1/3 of the plant, though.), I should have put it in something smaller?
Since I repotted it, it's just gotten more and more yellow. The base of the stems looks moist. Here are pics. I've plucked off most of the yellow leaves, but every day it gets yellower and yellower, more and more leaves die. You can see how many leaves have died. It's so sad.
http://picasaweb.google.com/ananimna/DYINGDRACAENA?pli=1#
Is there any hope? Did I kill this plant? Or is it worth trying to save?
Should I try to repot it yet again? In a smaller pot?
If I try to repot it, should I leave it outside of the soil for a bit, to let the roots air dry?
Is there anything I can do? I feel like it's dying every day (ok, yes, we all are, but this is dying really fast and I want to rescue it so much.)
Thank you so much in advance for any advice.