Yellow Zinnia Zinnia grandiflora

Plains zinnia is a water-wise, annual or perennial, dense, mounding wildflower in the Asteraceae (daisy) family. It is native to the limestone-based dry, sandy, loam or gravel soils in the southwestern region of the United States. It typically grows 4 to 8 inches tall and wide. The genus, Zinnia, is named in honor of Johann Gottfried Zinn, a German botanist.The species name grandiflora refers to big or showy flowers, which this zinnia does not disappoint. 

Plains zinnia can tolerate full sun to partial shade; however, it cannot tolerate wet conditions. Plant it 12 inches to 3 feet apart. The plant can be propagated by division, stem cutting, root cutting, or by seed. Cuttings or division should be done in the spring. The seeds may be difficult to source as they are easily broken when cleaned by a machine. This adaptive plant is deemed to be rugged and durable, existing in conditions characterized by rocky-sandy soils, severe heat, strong winds, and cold temperatures.  In the garden, it can flourish in typically difficult locations such as south-facing slopes and along hot driveways. With adequate and consistent moisture it will lose its brittle quality and will appear fuller with brighter blossoms.

Its multi-stemmed and multi-branched form gives it an almost shrub-like appearance. When not blooming, the tiny, needle-like foliage forms a low mat of green. This zinnia spreads by rhizomes, making it a go-to plant for erosion management on steep or sandy slopes.  Its long bloom season lasts for most of the summer, making it ideal for perennial gardens, rock gardens, and borders. A multitude of beneficial insects are attracted to the blooms, so it also is a good choice for a butterfly or pollinator garden.  

Insects, Diseases, and Other Plant Problems: No significant problems.  

The Clemson Cooperative Extension Home and Garden Information Center has a factsheet on common zinnia insect pests and diseases.

VIDEO Created by Elisabeth Meyer for "Annuals, Perennials, Vines, and Groundcovers" a plant identification course offered in partnership with Longwood Gardens.