Sow indoor 3-4 weeks before night temperatures remain above 55F.
Sow at 72-75F in medium/large individual pots as plants resent transplanting.
Sow at depth of 4 times the size of the seed.
Germination in 7-10 days.
Do not start early. Plants become leggy.
By our calculations, you should look at sowing Ambrosia Hybrid about 14 days before your last frost date.
Ambrosia, Ambrosia F1