Keep in mind when planting that Manna De Montana 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.
Soil temperature should be kept higher than
16°C / 61°F to ensure good germination.
By our calculations, you should look at sowing Manna De Montana about 28 days before your last frost date.
As Manna De Montana is tender, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.