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Temperature

Overwinter in a frost free greenhouse. For example, heat at 3°C (37°F) and vent at 5°C (41°F).

 

Light

Dianthus will perform best under high natural light levels. 

 

Crop Timing

Transplant plugs in WK40-12 for a spring finish. Multiple plugs can be used to fill larger pots. Later plantings can provide finished plants in summer and autumn. 

 

Relative Humidity

High humidity during the winter months can increase susceptibility of plants to pathogens such as Botrytis, Fusarium or bacterial leaf spot. Providing adequate air circulation will reduce the chance of infection.

 

Media

Use a peat-based growing medium with a pH of 5.3 to 5.8. Well-draining soil is very important during the winter months to prevent root rot.

 

Irrigation

Careful water management is always important. Dianthus will develop root rot if their roots are continually wet. 

 

Fertility

Regular liquid fertilization is recommended for Dianthus production. In general, we advise using a low nitrogen fertilizer throughout the growing season. Maintain media EC at 0.5 using a 1:2 dilution method.

 

Trim

Multiple trims will be necessary to form a well filled out plant as well as to delay flowering until preferred finish date. Last trim for spring sales should be at the beginning of April. Timing will depend on climate and location.

 

Space

Space plants before foliage is touching. Allow for adequate light and sufficient air movement to prevent disease. 

 

Pest Management

Dianthus must carefully be monitored for fungal diseases and root rot during the winter months. 

Insect pests such as aphids can commonly be found in the spring, distorting the foliage; thrips may be active in the crop once the flowers appear.