Keep in mind when planting that Guernsey Flair is thought of as half hardy, so remember to protect this plant from frosts and low temperatures. Guernsey Flair tends to grow best in a soil ph of between 6.0 and 6.5 meaning it does best in weakly acidic soil.
By our calculations, you should look at sowing Guernsey Flair about 105 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Guernsey Flair is a half hardy plant.