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Specifics
Name: Argyranthemum frutescens
Crop timing: Production time is 12-18 weeks including time for propagation. If starting with rooted cuttings, production time is reduced by four weeks.
Grower benefits: Cool weather crop; can be used as specimen, combination component and landscape plant.
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Argyranthemum frutescens is a good choice if you are looking for a cool temperature crop that can be grown for sales for the spring season and as a season extender. The Ecke Ranch offers an extensive selection of varieties with different flower forms and colors, including the upright, mounding Comets and the compact, floriferous daisy-type Meteors.
Plants can be propagated in various tray sizes including 72s, 84s, and 105s with one cutting per cell. Fill propagation trays with a well-draining growing medium with a pH of 6.0-6.5 and a low starter nutrient charge. Avoid media that retain excessive water. Maintain a medium temperature of 70°F-75°F to promote root development. Monitor the temperature closely and frequently.
Excess moisture and reduced airflow can promote Botrytis. Apply a preventive fungicide spray shortly after sticking cuttings.
Cuttings root easily without rooting hormones. However, time to root and uniformity in rooting may be improved by using a hormone.
Mist cuttings for about six to eight days so they remain turgid but avoid over misting. Within 48 hours after sticking apply a copper-containing fungicide spray.
Under low light levels stem stretch may occur. Plants respond to B-Nine sprays at 1,500 parts per million, Cycocel sprays at 1,000 ppm or a combination of the two chemicals.
Do not pinch cuttings during propagation. They should be ready to transplant four weeks after sticking.
For growing on use a sterile, well-aerated medium with a pH of 5.6-6.3 and an electrical conductivity level of 2.5 mmhos. Plant one cutting per 4- to 6-inch pots and two cuttings per 8- to 10-inch pots.
Begin fertilizing two weeks after transplant using a complete balanced fertilizer with minor elements. Apply 200-250 ppm constant liquid feed. Alternate with calcium nitrate or a cal–mag fertilizer on a regular basis. If additional iron is needed, apply iron chelate or iron sulfate. A slow release product may also be used to supplement a constant liquid feed program.
For best results plants should be established warm. Initially start plants at 65°F average daily temperature. For growing on maintain 60°F-70°F days and 60°F-65°F nights. Lower temperatures will slow growth and lengthen production time. Warmer temperatures can cause excess vegetative growth.
Maintain a relative humidity below 70 percent and provide good air circulation to avoid problems with Botrytis. Plants do best in bright light. Provide 5,000-6,000 footcandles.
Pinch plants one to two weeks after transplanting. Apply a copper-containing fungicide within 48 hours after pinching to prevent crown gall infection. Pinching is not necessary for 4-inch pots and for quick-turn crops. Good light levels and cultural practices are the best means of preventing stretch. If growth regulators are needed (B-Nine or Cycocel sprays at 1,500 ppm), make applications prior to visible bud to avoid flowering delay.
Pests include aphids, thrips and whiteflies. Botrytis, root and stem rots and crown gall can be disease problems.
Production time is 12-18 weeks including time for propagation.
For more: Ecke Ranch, (760) 944-4060; www.ecke.com
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