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Antirrhinum can be propagated in various tray sizes including 32,50,72,84 and 105’s. Stick one cutting per cell. Propagation Cycle: 5 weeks (Rosey Dragon may be slower to root.)
- 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.
- Antirrhinum will benefit from the use of rooting hormone.
- Use a product containing 3000 ppm IBA.
- Average days with mist vary from 6-9 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.
- Mist should be eliminated or significantly reduced as roots form.
- Antirrhinum can stretch quickly in propagation especially if the media is over saturated.
- To prevent stretch apply a tank mix of B-Nine®/Cycocel® 2500/1000 ppm on Day 5-7.
- Pinch or shear cuttings in week 2 of propagation to improve plant habit and correct stretch.
- Begin feeding as roots are visible. Begin with 75 ppm nitrogen then increase to 150 ppm. Choose a fertilizer with low levels of ammonium based nitrogen and avoid overhead feeding with fertilizer containing phosphorus.
- Maintain pH at 5.5-5.8
- Maintain EC at 0.75-0.80 mmhos.
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. Do not allow mature plants to dry excessively.
- Fertilizer Regime
- Begin fertilizing 2 weeks after transplant.
- Choose a complete balanced fertilizer complete with minor elements.
- Apply 200-250 ppm constant liquid feed with a fertilizer low in phosphorus.
- Extra calcium will help to strengthen stems.
- 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 5.5-5.8.
- Optimum EC is 1.5 to 2 mmhos. Provide periodic clear water application if excess salts accumulate.
Antirrhinum can be grown successfully at a wide range of temperatures but for best results the crop should be established warm and finished cool.
Establishing temperature: 68°F/20°C average daily temperature
Temperatures for growing on: 55-65°F/12-18°C
- At cooler temperatures growth will be more compact and flowering more prolific.
- At warmer temperatures excess vegetative growth may be a problem and flowering will be reduced.
- Maintain relative humidity below 70% and provide good air circulation to avoid problems with botrytis.
Antirrhinum prefers bright light.
- 4000 foot candles/43,100 lux minimum
- 6000 foot candles/64,600 lux maximum
- Bright light will encourage strong growth. During periods of high light avoid moisture stress
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- week 2 of propagation
2nd Pinch – 14 days after transplant
Plant Growth Regulators
Good light levels, cool growing conditions, and good cultural practices are the best means of controlling stretch.
If needed, Brachyscome responds to:
- Bonzi® as a spray at 5-10 ppm
*Apply any PGR applications prior to visible bud set to avoid delay in time to flower.
Insect and Disease Concerns
- Fungus Gnats
- Spider Mites
- Powdery Mildew
- Root and stem rots
- Downy Mildew
|Product Form||# Liners per pot||Total Crop Time (weeks)|
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