Look to ensure a distance
11.7 inches (30.0 cm) between Aztec Firebird seeds when sowing to make sure your seedlings have enough space.
By our calculations, you should look at sowing Aztec Firebird about 42 days before your last frost date.
As Aztec Firebird is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.