Thin out.
Try to plant in a location that enjoys full sun and remember to water often. Keep in mind when planting that Over the Rainbow is thought of as very hardy, so this plant will survive though longer winters with little or no damage. Ensure your soil is loamy and sandy and has a ph of between 6.0 and 6.5 as Carrot is a weakly acidic soil loving plant.By our calculations, you should look at sowing Over the Rainbow about 14 days before your last frost date.