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Will The Mewa kumquat if grown outdoors need to be in zone 8 or higher.
This is true. These two kumquats grafted on PT are as hardy as you can get. Here in S. Louisiana Volk makes a good rootstock for lemon. Meyer lemon is not grafted. It is grown on its own roots. Should we have an event (cold) that damages MLemon it comes back from the root system. If it is grafted on rootstock other than PT or FD it will not come back. If the event is cold enough the lemon is killed and the FD or PT comes back... I have never had a problem with kumquat grafted on PT or FD.
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I have a seed grown Fukushu/changshou planted outside in ground. I have not gotten any fruits yet. It has just completed its 4th year outside from 3-8-16. I live in zone 6 Cincinnati Oh on the teays river bank. I do not have any Idea how cold it has gotten for it but it is doing very well