Try to plant in a location that enjoys full sun and remember to apply water fairly sparingly. Keep in mind when planting that Powis Castle is thought of as hardy, so this plant will survive close to or on freezing temperatures. Powis Castle requires a soil ph of 5.5 - 7.0 meaning it does best in weakly acidic soil - neutral soil.
Growing Powis Castle from seed
By our calculations, you should look at sowing Powis Castle about 63 days before your last frost date.
Transplanting Powis Castle
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Powis Castle is a hardy plant.