Best Hostas for Zone 9 Since most hostas require a minimum dormancy period of 30 days at temperatures below 43 degrees Fahrenheit, hostas grown in the low-chill winter zone of Zone 9 will emerge, but may become weak and may continue to deteriorate during the subsequent season. For hosta lovers located in the warmer zone of Zones 9, finding a hosta that will perform well in your area can be a bit more difficult.
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