Keep in mind when planting that German 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 German in sandy, potting mix and silty soil with a ph of between 5.6 and 7.5 is ideal for as it does best in weakly acidic soil to weakly alkaline soil.
Growing German from seed
By our calculations, you should look at sowing German about 0 days after your last frost date.
Transplanting German
As German is tender, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.