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Zinnia annuals are single stem flowers, they can range in looks from single row of petals to multiple rows of petals and different foliage growing patterns. They need 6 to 8 hours of sun and will need some shade relief in the summer time. Dead heading will help get the most blooms out of the season. They also prefer a moist soil and good airflow, so be careful not to overcrowd or over water to keep them looking healthy.