South of the Border Zinnia Mix shows off the warm, bright colors that Zinnias are known for. Zinnias are one of our most popular wildflower varieties at American Meadows, and for great reasons. They grow rapidly from seed - about 6-8 weeks after seeding – and offer long lasting blooms for weeks on end over the summer, right up until frost. Plant in full sun, and you’ll have loads of beautiful flowers with plenty to cut and bring inside. Zinnias can be grown in any zone.