Hollyhock (Alcea rosea)-Hort Answers - University of Illinois Extension
University of Illinois Extension

University of Illinois Extension

Hort Answers

Annual

Hollyhock
Alcea rosea


 
Features
Often used as background plant or specimen plants in the cutting garden. Long-time garden plant that has the ability to reseed and come back for years.  
 
Culture
Full sun, and well-drained soil. Technically a biennial but if planted early they are best treated as annuals. They may come back in the spring or new plants may sprout from the seeds.  
 
Cultivars
  • 'Indian Spring'
  • 'Nigrita'
  • 'Chaters Purple' (double)
  • 'Summer Carnival'
 
 
Mature Height
2-6 Feet
 
Size
Medium
Tall
 
 
Annual Hardiness Type
Hardy Annual
 
 
Bloom Color
Pink
Purple
Red
White
Yellow
 
 
Bloom Season
June - August
 
Soil Conditions
Moist, Well-Drained
 
 
Exposure/Light Requirements
Full Sun
 
 
Pests and Problems

Environmental Damage

Fungal Disease

Herbicide Injury

Insect Damage

Insect Relative Damage


Additional pests and problems that may affect this plant:

Japanes Beetles, slugs, spider mites, rust, leaf spots, anthracnose

Tall varieties may need staking. Planting hollyhocks in different parts of the garden and garden sanitation helps to lessen rust disease problems.

 
Additional Notes
May need staking to prevent wind damage. Pinch main stem early in the season to produce bushier, shorter plants less likely to need staking.

 

 
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