Finishing
Try Chrysal Alesco ® , a postharvest foliar spray, to protect ethylene sensitive crops during shipping and retail.
Temperature Day: 66–68 °F (19–20 °C) Night: 64–66 °F (18–19 °C) Average daily temperature: 68 °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 short day Daily light integral (DLI): 16–18 mol·m -2 ·d -1
Scheduling SIZE
CROP TIME PLANTS PER POT
1.25 to 2.5 quart (5.5 to 6.5 inch, trade gallon)
8–10 weeks 1 ppp
3.0 quart to 2.0 gallon (7.5 to 10 inch) 1.5 gallon container (10 inch container) 2.0 gallon container (12 inch container) 3.0 gallon container (14 inch container)
9–10 weeks 2–3 ppp
10–11 weeks 3 ppp
Transplanting: Transplant directly into the finished container. Place the rooted liner relatively deep in the container. Dahlias need deep and sturdy planting to provide good support and balance in the pot for the maturing plants. 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: Not necessary. Pinching will delay flowering by 1 week. Plant growth regulators (PGRs): Miss Mandy has a sturdy, well- branched habit and will need moderate PGR treatments during finishing. Sprays of B-Nine ® WSG at 2500 ppm are recommended at 4 weeks and 6 weeks after transplant to help control growth. Sprays of Florel ® at 250 ppm at 4 weeks and 5.5–6 weeks after transplant will also help to control growth and can be used instead of the B-Nine ® WSG sprays. The Florel sprays will also help prevent late- season flower peduncle stretch. A Bonzi ® drench at 2–4 ppm can be used to hold plants for sale. Tech tip: The ideal photoperiod during finishing to provide the correct balance between vegetative growth and flower formation is between 13–14 hours. Growing under very short natural days (< 12 hours) will result in short plants, fast flowering, and root tubers. Growing under too long of day lengths will result in an overly vegetative plant and delay flowering. Provide warm temperatures early on in finishing to allow plants to establish after transplant. Miss Mandy grows best under moderately warm temperatures. Avoid extreme heat stress, especially under relatively high light intensities. Scout and treat for a range of insects and diseases, including spider mites, thrips, and powdery mildew. Moisture level: Media should be allowed to dry between irrigations. Alternate between moisture level 2 and 4. 2 - MEDIUM: Soil is light brown in color, no water can be extracted from soil, and soil will crumble apart. 4 - WET: Soil is dark brown but not shiny, no free water is seen at the surface of the soil, when pressed or squeezed water drips easily, and trays are heavy with a visible bend in the middle. Common pests: Aphid, spider mites, thrips, leafminers Common diseases: Botrytis , powdery mildew, basal stem rot
10–11 weeks 4 ppp
10–11 weeks 5 ppp
Estimated finish crop time is from transplant of a 105-cell tray and finished at an average daily temperature (ADT) of 68 °F (20 °C). Example crop schedule for a 2.5 quart
WEEKS FROM TRANSPLANT
DESCRIPTION
Provide an average daily temperature of 68 °F (20 °C) and DLI levels above 15 mol·m -2 ·d -1 . Pinch plants when they are rooted into the pot. Make sure photoperiod is between 13–14 hours per day. Apply a spray of B-Nine® WSG at 2,500 ppm or a spray of Florel® at 250 ppm to control growth. Apply a spray of B-Nine® WSG at 2500 ppm or a spray of Florel® at 250 ppm to control growth. Scout for spider mites, aphids, thrips, and powder mildew and treat if needed. Apply a broad-spectrum fungicide drench to prevent late-season basal stem and root rot.
1 week
4 weeks
6 weeks
7 weeks
9 weeks
Finish
Miss Mandy
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