Did you repot it? If not, it could be pot bound. And are you fertilizing it? Maybe it's hungry!

Hi,
Yes I re-potted it and even had it planted in the garden during the summer without any pot at all. It also has gotten fertilized as well. I have had stunted vegetable plants as well. I don't know if it makes a difference or not but my garden soil is very acidic to the point growing spring onions in it is not possible.

It sounds as if it is in a draft and not warm enough (it's from Mexico) and that it's not receiving enough strong light. They don't like direct sun nor much water. Also, check for spider mites - they LOVE this plant!

Agreed, but some morning or late afternoon direct exposure that far north might be necessary, eased into, not suddenly thrust. It would also not appreciate having soggy roots in the cold, let it dry out if wet.