Plant growth regulators (PGRs): Sunfinity ® Double sunflower has good vigor and generally will need chemical growth regulation in propagation. To control growth after rooting, sprays of B-Nine ® WSG (2,500-3,500 ppm) are usually sufficient. For all sprays listed above, the mist should be off for a minimum of one hour for the PGR to absorb into the leaf tissue. Bonzi ® (paclobutrazol) media sprenches at 0.5–1.0 ppm at 2.5 to 3 weeks after sticking can be applied to maintain control of internode growth.
Moisture level: Media should be allowed to dry between irrigations. Alternate between moisture level 2 and 3. 2 - MEDIUM: Soil is light brown in color, no water can be extracted from soil, and soil will crumble apart. 3 - MOIST: Soil is brown in color, strongly squeezing the soil will extract a few drops of water, and trays are light with no visible bend. Common pests: Aphids, spider mites, thrips, whiteflies, caterpillars Common diseases: Botrytis, Pythium, Rhizoctonia, Thielaviopsis , powdery mildew, downy mildew, rust
Finishing Temperature
Scheduling
Day: 70–72 °F (21–22 °C) Night: 66–68 °F (19–20 °C) Average daily temperature: 69 °F (20 °C) Lighting Day extension lighting: Beneficial to 14 hours Light intensity: 800–1,200 µmol·m -2 ·s -1 Day length response: Facultative long day Daily light integral (DLI): 14–16 mol·m -2 ·d -1
PLANTS PER POT
SIZE
CROP TIME
1.25 to 2.5 quart (5.5 to 6.5 inch, trade gallon)
7–8 weeks
1 ppp
3.0 quart to 2.0 gallon (7.5 to 10 inch) 2.5 to 6.0 gallon planter (12 to 14 inch)
7–8 weeks
1–2 ppp
9–10 weeks
2–4 ppp
Estimated finish crop time is from transplant of a 105-cell tray and finished at an average daily temperature (ADT) of 69 °F (20°C).
Transplanting: Transplant directly into the finished container. Place the rooting media slightly below the level of media in the container. Make sure that the root ball is covered and that the liner is situated in the center of the pot. Media pH: 5.8–6.2 Media EC: SME EC: 1.5–2.1 mS/cm, PourThru EC: 2.3–3.2 mS/cm Fertilizer: 200–250 ppm N Pinching: Optional Plant growth regulators (PGRs): Sunfinity ® Double sunflower has good vigor and generally will need chemical growth regulation. Sprays of B-Nine ® WSG (2,500–5,000 ppm) or Sumagic ® (20–30 ppm) can be used to control growth. Bonzi ® (paclobutrazol) drench at 1–2 ppm at 3–4 weeks after transplanting; if needed Bonzi drench at 1–2 ppm to hold size at finish. Tech Tip: For earliest flowering, provide long days, high light levels, and warm temperatures. Preventive fungicide applications for powdery mildew are recommended, especially in high humidity environments. Palladium ® , Micora ® and Segovis ® fungicides have all been effective at suppressing pathogens. Insecticides, such as Avid ® , Mainspring ® and Flagship ® , are effective.
Example crop schedule for a 2.5 quart
WEEKS FROM TRANSPLANT
DESCRIPTION
Provide average daily temperatures of 69 °F (20 °C) and DLI levels above 15 mol·m -2 ·d -1 . An optional pinch could occur when they are rooted into the pot. Apply preventative fungicides and insectides. Sprays of B-Nine ® WSG (2,500–5,000 ppm) or Sumagic ® (20–30 ppm) can be used to control growth. Evaluate plants and apply a Bonzi ® drench at 1 to 2 ppm to maintain compact, controlled growth. Drop temperature if needed to help control growth.
1 week
2 weeks
3 weeks
6 weeks
8 weeks
Finish
All photos are either the property of Syngenta or are used with permission. © 2023 Syngenta. Important: Always read and follow label instructions. Some products may not be registered for sale or use in all states or counties. Please check with your local Extension Service to ensure registration status. Some or all of the varieties may be protected under one or more of the following: Plant Variety Protection, United States Plant Patents and/or Utility Patents and may not be propagated or reproduced without authorization. Trademarks are the property of their respective owners.
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