By our calculations, you should look at sowing Nova about 35 days before your last frost date.
Calendula officinalis var. prolifera.
An heirloom (antique) variety, open-pollinated, passed down for generations for its virtue as a food and medicine plant. 1
Also beneficial to bees and beekeepers, and is a good companion plant!
The name Calendula means throughout the months because calendula flowers nonstop throughout the season from spring till fall.3
Originally from Ancient Egypt, this medicinal plant found its way to ancient Greece via trade. From Greece it was taken to the Roman Empire via trade.
Later on it went from Rome to Britain via Roman conquistadors, ie. Julius Caesar.
2
So useful a plant that UK natives did not get rid of it. Instead they wisely chose to use and even cultivate it, although it had been brought in by an oppressor.
In India they are held as a sacred flower and used to make garlands and decorations for weddings and other religious festivals.3
Calindula, british marigold, ‘Nova’, ‘Pacific Beauty’, UK marigold
Pacific Beauty
1 http://www.kingsseeds.co.nz/shop/Herbs/Culinary/Other+Culinary+Herbs/Calendula+Nova-6157.html
2 http://www.herbs-hands-healing.co.uk/singleherbs/marigold.html
3 myzanestate.com/PotMarigold/calendula-pot-marigold-nova
4 seeds-plants.mr-fothergills;co.uk/Gardening-Calendula-Pot-Marigold-Nova#.VN110C4-oTs