Answer: The major concern about growing yuccas in containers is that the root systems will be above ground and susceptible to winter dieback. The roots are hardy to about 20F. If your garden does not get that cold, or if you are willing to wrap the containers to protect the roots during the winter, then you can successfully plant your yuccas in large pots. Since these plants eventually get quite large, you'll want to use something big - a half-whiskey barrel, perhaps.
Fall is an excellent time to plant or transplant yuccas so whether you decide to plant them in containers or move them to another part of the yard, now is the best time.
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