The following citrus varieties are hardy enough to be grown in ground in Zone 8b: Hardy to about 15°F (-9°C) with some winter protection. The good news is that there are several hardy citrustree varieties - being citrustrees suitable for zone 7 or even colder. Zone 6a, citrus? tim Trammell. Posts: 19.For a sweet citrus eaten off the tree - I'd agree that either a solar green house or a potted indoor/outdoor plant is the best way to go. Citrus needs full outdoor sun to thrive. If you are outside of the citrus growing zones (usda 8-11) you can bring your potted tree indoors during winter and supplement with grow lights. Temperatures in USDA zone 7 may dip down as low as 10 to 0 degrees F. (-12 to -18 C.). Citrus doesn't tolerate such temperatures, even the most hardy citrustree varieties. When it comes to growing citrustrees, there are a few things you need to consider before getting started. Your climate zone, variety of citrustrees and rootstock... Adapting CitrusTrees to Colder Climates. Growing citrustrees in zone 8 can be a rewarding endeavor, as there are cold hardy varieties that can thrive in this climate. Some gardeners may be able to grow palms and even cold-hardy citrus in parts of Canada, according to the federal government's latest Plant Hardiness Zones. Citrustrees thrive in warm, frost-free environments, which is why they famously grow so well in Florida and Southern California. According to Yarden.com, Growing Zones... Zone 9a is particularly well-suited for evergreen and subtropical trees that are sensitive to frost and do not require a cold dormancy period. Citrustrees are highly successful here, as they are...
