Keep in mind when planting that Dutch is thought of as hardy, so this plant will grow or become dormant during the winter. A soil ph of between 6.1 and 7.8 is ideal for Dutch as it does best in weakly acidic soil - weakly alkaline soil.
Growing Dutch from seed
By our calculations, you should look at sowing Dutch about 5 days after your last frost date.
Transplanting Dutch
As Dutch is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.