Try to plant in a location that enjoys full sun and remember to apply water fairly sparingly. Roundhay is generally regarded as a hardy plant, so this plant will survive close to or on freezing temperatures. Roundhay needs a soil ph of 5.5 to 7.0 (weakly acidic soil - neutral soil).
Growing Roundhay from seed
By our calculations, you should look at sowing Roundhay about 63 days before your last frost date.
Transplanting Roundhay
Roundhay is hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.