Deadhead often.
Try to plant in a location that enjoys full sun and remember to water moderately. Keep in mind when planting that Swirls is thought of as tender, so remember to wait until your soil is warm and the night time temperature is well above freezing before moving outside. Planting Swirls in loamy and sandy soil with a ph of between 6.6 and 7.8 is ideal for as it does best in weakly acidic soil to weakly alkaline soil.By our calculations, you should look at sowing Swirls about 21 days before your last frost date.