Probably not enough sun, also try using a general liquid fertelizer they sell every two weeks. Sun is they key ingredient, at least 6 hours. Also its better to underwater than overwater them. If theybare in a pot feel for watwr weoght and wait until the soil drys. Also if its in a container make sure to use fresh potting soil.
Talk to them about the problem. I have found them to be very willing to help.
Please call them!
Take a picture of them and location and bring to them. Or email pics and questions to them.
You can call them and tell them the problem you're having. They'll get someone knowledgeable to help you
Need sun and water.
My guess is they are not getting light, or the soil is poor. My geraniums are booming
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