Cactus zinnia from bud to seed harvest. ⁣⁣ ⁣⁣ At the end of the season, leave the blooms on the largest, prettiest zinnias. Let the flower head dry completely on the plant. ⁣⁣ ⁣⁣Seeds are ready when the flower head is dry and brittle. The petals will dry and fall away. The seeds attach to the the large center of the flower head. ⁣⁣ ⁣⁣ Harvest the seeds to plant in your garden next season and to share with friends. Teach your friends how to grow zinnias too. ⁣⁣ Learn more about growing zinnias he