Zinnia (Zinnia elegans / Zinnia marylandica)-Hort Answers - University of Illinois Extension
University of Illinois Extension

University of Illinois Extension

Hort Answers

Annual

Zinnia
Zinnia elegans / Zinnia marylandica

<em>Zinnia elegans</em>
Zinnia elegans
 
Features
Good garden annual for beds or pots. Good cut flower. Large colorful blooms on very sturdy plants. Bloom size ranges from 1-4 inches in diameter. 
 
Culture
Full sun, in moist well-drained soil. 
 
Cultivars

Zinnia elegans

Short (8-12 inches)

  • ‘Dreamland’ Series
  • ‘Magellan’ Series
  • ‘Short Stuff’ Series
  • ‘Thumbelina’ Series

Medium (14-18 inches)

  • ‘Bridesmaid’
  • White Wedding’
  • ‘Champagne Toast’
  • ‘Lilliput’ Mix

Tall (2-3 feet)

  • ‘State Fair’
  • ‘Zowie Yellow Flame’
  • ‘Giant’ Series
  • ‘Oklahoma’ Series

Zinnia angustifolia

  • ‘Profusion Double’ Series
  • ‘Profusion Knee High’ Series

Zinnia marylandica

  • ‘Zahara’ Series
  • ‘Uptown’ Series
  • ‘Double Zahara’ Series
 
 
Mature Height
8-36 Inches
 
Size
Medium
Tall
 
 
Annual Hardiness Type
Tender Annual
 
 
Bloom Color
Green
Lavender
Pink
Red
White
Yellow
 
 
Bloom Season
May - September
 
Soil Conditions
Moist, Well-Drained
 
 
Exposure/Light Requirements
Full Sun
 
 
Pests and Problems

Bacterial Disease

Environmental Damage

Fungal Disease

Insect Damage


Additional pests and problems that may affect this plant:

Powdery mildew, xanthomonas leaf spot, botrytis, alternaria leaf spot, cercospora leaf spot
 
Additional Notes

For dependable, low maintenance zinnias resistant to powdery mildew, consider using Zinnia angustifolia cultivars. They produce numerous single flowers on compact spreading plants. They include: 'Crystal White' 10-14 inches tall, white flowers; Crystal Orange 10-14 inches tall, orange flowers; 'Star Orange' 10-14 inches tall, orange flowers; 'Star White' 10-14 inches tall , white flowers. The 'Profusion' Series, Zinnia hybrida also are excellent choices for disease tolerant zinnias.

Deadhead for continuous bloom.

 

 
Related Resources
Home, Yard & Garden Pest Guide
Illinois Commercial Landscape and Turfgrass Pest Management Handbook
U of IL - Distance Diagnosis through Digital Imaging
U of IL - Plant Clinic