Try to plant in a location that enjoys full sun and remember to water moderately. Keep in mind when planting that Hannay's Purple is thought of as hardy, so this plant will survive close to or on freezing temperatures.
Growing Hannay's Purple from seed
By our calculations, you should look at sowing Hannay's Purple about 84 days before your last frost date.
Transplanting Hannay's Purple
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Hannay's Purple is a hardy plant.