Hardy citrus in zone 6?
I know there are some citrus family plants that are supposed to be hardy in zone 6 - namely Poncirus trifoliata ("Trifoliate orange") and it's variety called P. trifoliata "Flying Dragon". There are other citrus types also, such as citranges and citrumelo that are also fairly hardy, but I'm not sure if they're for zone 6. I wondered if anyone has grown or is growing either of these in zone 6, without protection. If so, what results have you had? I will not be able to protect any plants so they have to be able to handle winter on their own. Anyone with any experience and/or information, please let me know what you've found. I'd like to try one or two of these. Thank you.