If planted deeply and in well-drained soil, these plants can be successfully overwintered in much colder climates than expected… even up to zone 6.
Try to plant in a location that enjoys full sun and remember to water often. Keep in mind when planting that Crowborough is thought of as half hardy, so remember to watch your frost dates and ensure you have this plant protected when the temperature dips.Found in a garden in Crowbrough, Sussex