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My experience is that they are much hardier than 45F, even in pots.
I live in NW FL, Zone 8b. We get frosts and freezes here every year; most years the coldest temps we get are somewhere in the mid-upper 20s, but some years they go as low as the lower teens. Sago palms (Cycas revoluta) are grown *everywhere* around here. I've got several myself (some dating from 1992-1993), which I have *never* protected from the cold. In the coldest winters, some or all of the foliage dies (turns brown). We simply prune off the damaged foliage and they sprout new leaves in the spring. In mild winters, the foliage usually takes no damage at all. Some people protect their especially nice (heavily branched and full) sagos from all frost - but they do it for strictly cosmetic reasons. But don't take my word for it: http://ag.arizona.edu/pima/gardening..._revoluta.html http://www.floridata.com/ref/c/cyca_rev.cfm http://www.junglemusic.net/palms/cycas_revoluta.htm http://www.sunpalmtrees.com/Cold-Har...Sago-Palms.htm These are planted in the ground. Plants in pots would be more susceptible to cold, but they can still take much more cold than 45F. My mother, who lives several miles north/inland of me, kept several outside in 3-gallon pots for about 3 years. Their only protection was provided by the oak tree they sat under. None of them suffered any lasting harm (just some frond damage), despite temps in the 20s each winter. Also, the local plant retailers sell them year-round here. They leave the potted sagos (1 gallon size and up) outside, unprotected, except during the very hardest freezes. I've shopped many times after a frost or freeze and seen row upon row of healthy green fronds soaking up the sunshine - very cheery on a cold January morning. Yes, Dallas winters would kill a potted sago. The OP should plan on bringing it inside each winter. But I think he can safely leave it outside until just before the first frost, not just until the nighttime temps drop below 50F. Laura |
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