Argyranthemum frutescens

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.

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.

Plants can be propagated in various tray sizes including 72s, 84s, and 105s with one cutting per cell. Avoid media that retain excessive water. Maintain a medium temperature of 70°F-75°F to promote root development.
Excess moisture and reduced airflow can promote Botrytis. Apply a preventive fungicide spray shortly after sticking cuttings. 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. PGR applications will benefit the crop.
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.

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. If growth regulators are needed, make applications prior to visible bud to avoid flowering delay. Note: Do not tank-mix or apply within 7 days the PGR daminozide (Dazide, B-Nine) with compounds containing copper.

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.