About a week ago I got 5qt container with 3 New Gunia Impatien plants in it. I transplanted each into a new pot and put them in separate places. All three plants look like the stems are drooping or bending over, but the leaves look all perky. One of them has leaves that are turning black, but the stem on it looks healthy other than leaning over. Am I doing something wrong. They are all in my house where the temp. is about 78 and in window sills.

Thanks,

Engi