Try to plant in a location that enjoys full sun and remember to apply water fairly sparingly. Keep in mind when planting that Harmony is thought of as very hardy, so this plant will tend to survive through freezing conditions.
Growing Harmony from seed
Transplanting Harmony
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Harmony is a very hardy plant.
By our calculations, you should look at planting out Harmony about 21 days before your last frost date.