This guy in Nebraska combines a few methods Geothermal orange grove! Heavy yields! . Had good luck with a dwarf citrumelo here which came from a local nursery. Here is a video on cold hardy citrus. Wanting to try satsuma. Yuzu is very hardy and im thinking about trying it. Have grown trifoliata but they are not something i care for. They can always be grafted over if someone is growing trifoliata