Any winter hardy cirtus trees for a northern zone?
Are there any winter hardy citrus trees that will grow this far north? Even though we are technically a z7 now, we do get short very cold periods (in the teens with wind chill below zero).
My neighbor grows several varieties of fig and winter wraps his trees. ie mummifies them. Could I do the same with a lemon? I am particularly interested in a Meyer Lemon, but any citrus tree would be an intersting novelty.
Thanks for any and all advice!