Click on this link to print or save this document: Verbena
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. Once plants have established do not allow drying excessively which will result in damage to foliage and flowers.
- 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 between general purpose fertilizer mixes and calcium-potassium fertilizers. Too much ammonium nitrate promotes excessive leaf size and internode stretch.
- 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.
Establishing temperature: 65°F/18°C average daily temperature
Temperatures for growing on: 65-75°F/18-24°C day and 60-65°F/15-18°C night
At lower temperatures
- Flowering will be delayed
- Leaf yellowing may occur
- Maintain relative humidity below 70% and provide good air circulation to avoid problems with botrytis.
Verbena prefers bright light.
- 5000 foot candles/53,800 lux minimum
- 6000 foot candles/64,600 lux maximum
* Tropical Breeze and Costa del Sol Verbena are day neutral and will flower year around, however, flowering is more prolific and earlier under longer days when total light is higher.
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- once plants have established (2-3 weeks after transplant) pinch to the 4th or 5th node.
2nd Pinch- trim plants to the edge of the pot to promote fullness.
Additional Pinch- shape, correct stretch or time to flower (mature plants will flower 5-6 weeks after pinch).
Low light, excess moisture, high ammonium feed and positive DIF cause stretching. Use high light, moderate irrigation and lower feed levels for optimum growth control. If needed Verbena responds to:
- B-Nine® as a spray at 1500-2500ppm
- Cycocel® as a spray at 1500-2000
Insect and Disease Concerns
- Fungus Gnats
- Spider Mites
- Powdery Mildew
- Root and stem rots
|Season||Container Size||Cuttings per pot||Weeks to first pinch||2nd Pinch||Total Crop Time# of Weeks|
|Spring||4” – 6”||1||1-2||N/A||6-10|
|Summer||4” – 6”||1||1-2||N/A||6-9|
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