By our calculations, you should look at sowing Karo F1 about 14 days before your last frost date.
Sow in deep, well-worked, stone-free soil after danger of heavy frost from spring to midsummer. Do not transplant, as crooked roots may result. Cultivate periodically or mulch to control weeds. Keep soil evenly moist.
Karo F1 is very hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.By our calculations, you should look at planting out Karo F1 about 14 days before your last frost date.