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Argyranthemum can be propagated in various tray sizes including 72, 84, and 105’s. Stick one cutting per cell. Propagation Cycle: 4 weeks
- Choose a well-drained aerated propagation media
- Avoid media containing peat moss which will hold too much water
- Choose a blended media with other components or inorganic media such as Oasis® or Rockwool®
- Bottom heat will promote healthy root development.
- Maintain bottom heat at 70-75°F/21-24°C.
- Mist will cool the media temperature. Monitor media temperature closely and frequently.
- Argyranthemum roots easily without the use of rooting hormone. However, time to root and uniformity in rooting may be improved with use of a hormone.
- Either liquid or powder formulations work equally well. Choose a product with up to 2500 ppm IBA or up to 500 ppm NAA.
- Average days with mist vary from 6-8 days depending on environmental conditions in the greenhouse.
- Mist cuttings so they remain turgid but avoid over misting that results in saturated media.
- Over misting will result in slow rooting and possible problems with root rot and botrytis.
- Within 48 hours after sticking apply a fungicide spray with a chemical containing copper such as Phyton 27, Camelot, or Kocide 2000.
- Stretch may be an issue under low light levels. Argyranthemum respond to B-Nine sprays at 1500ppm, Cycocel sprays at 1000 ppm, or a combination of the two chemicals.
Potential Problems in Propagation
- Do not pinch in propagation – Argyranthemum are susceptible to Crown Gall which may be a problem if the cuttings are pinched in propagation.
- Excess moisture and reduced airflow will promote botrytis – apply a preventive spray shortly after sticking.
Choose a media with the following traits:
- Good aeration
- Porosity between 5-15%
- Avoid excess irrigation and fertilization while plants are establishing which can lead to slow root development.
- Fertilizer regime:
- Begin fertilizing 2 weeks after transplant
- Choose a complete balanced fertilizer complete with minor elements
- Apply 200-250 ppm constant liquid feed
- Alternate with calcium nitrate or a cal –mag fertilizer on a regular basis. Magnesium is especially important as flowering begins. Epsom salts can also be applied on a monthly basis.
- Additional iron may be needed – apply as iron chelate or iron sulfate (always rinse foliage when using iron sulfate)
- A slow release product may also be used to supplement a constant liquid feed program and may provide improved performance for the consumer
- Maintain pH between 5.5-6.3
- Optimum EC is 2 to 2.5 mmhos. Provide periodic clear water application if excess salts accumulate.
Argyranthemum can be grown successfully at a wide range of temperatures but for best results the crop should be established warm. As root growth and top growth begins temperatures can be reduced.
Establishing temperature: 65°F/18°C average daily temperature
Temperatures for growing on: 60-70°F/13-21°C day and 60-65°F/13-15°C night
At lower temperatures:
- Growth will be slower and time in production longer
At warmer temperatures:
- Excess vegetative growth may be a problem
Maintain relative humidity below 70% and provide good air circulation to avoid problems with botrytis.
Argyranthemum prefers bright light. For best results grow in a greenhouse with retractable roofs or in a field production setting.
- 5000 foot candles/53,800 lux minimum
- 6000foot candles/64,600 lux maximum
Establish plants pot tight than space to::
- 4” pots – 5-6” centers (approximately 2 per sq. ft.)
- 6” pots/1 gallon – 14” centers
- 8” pots – 18” centers
1st pinch – 1-2 weeks after transplant
2nd pinch – no additional pinches should be necessary
* In 4” containers or for a “quick turn” crop pinching is not necessary
- Apply a fungicide containing copper within 48 hours after pinching to prevent a crown gall infection
Plant Growth Regulators
Good light levels and cultural practices are the best means of controlling stretch.
If needed, Argyranthemum responds to:
- B-Nine as a spray at 1500 ppm
- Cycocel as a spray at 1500 ppm
*Apply any PGR applications prior to visible bud set to avoid delay in time to flower.
Insect and Disease Concerns
- Root and stem rots
- Crown Gall
|Container Size||# of cuttings per pot||Time to pinch (weeks) after transplanting||Total crop time* (weeks)|
*crop time is reduced under warmer growing conditions.
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