2024 New Variety Culture Guides Vegetative Annuals | NA

Miss Mandy

Dahlia Miss Mandy Culture Guide Dahlia x hybrida

Bottom heat temp: 70–74 °F (21–23 °C) for the first three weeks. After roots are well developed, temperatures can be lowered to hold and tone the cuttings. Misting: Mist schedules vary depending on light and temperature conditions. Apply just enough moisture to rehydrate the cuttings and keep them from wilting. Cuttings should be hydrated and in a non-wilted stage within 24 hours after sticking. Cuttings that continue to wilt heavily after 24 hours will callus unevenly and will be delayed in rooting. CapSil ® (spray adjuvant) can be sprayed on the cuttings at a rate of 2–4 oz/100 gal within 1–2 days after sticking to help in rehydration of the cuttings. Misting should be significantly reduced after 2–3 days and after cuttings become fully hydrated. Rec. tray size: 105-cell (30 mm) or larger Propagation timing: 3.5–4 weeks for a 105-cell liner; add more rooting time for significantly larger liner sizes. Tech tip: Long-day lighting (day length extension or night interruption) is needed during propagation to avoid premature flowering and tuber formation. Temperature

Product form: Vegetative Containers: Gallons Habit: Mounded Garden Specifications Garden Height: 18–24” (45–60 cm) tall Garden Width: 14–18” (35–45 cm) wide

Day: 72–74 °F (22–23 °C) Night: 70–72 °F (21–22 °C) Average Daily Temperature: 70–74 °F (21–23 °C) Lighting Day extension lighting: Necessary to 14 hours

Exposure: Part Sun USDA zone: 10–11 AHS zone: 10–3 Product use: Containers, Landscapes, Patio Pots, Combos Propagation of Unrooted Cuttings Root emergence: 8–10 days Rooting hormone: Beneficial. A 0.1% (1,000 ppm) IBA concentration using either powder or liquid formulations can be applied to the lower portion of the cutting stem. Be careful not to coat the leaves or entire cutting–excess application can cause burning and damage to the cutting. Another option is to apply an overhead heavy spray to the cuttings (penetrating the rooting media) using water-soluble K-IBA (Hortus or Advocate) at 250–300 ppm 24–48 hours after sticking. Do not use overhead applications of alcohol-based IBA solutions (ex. Dip ‘n Grow ® ).

Light intensity: 200–250 µmol·m -2 ·s -1 for the first two weeks after sticking or until root development occurs. Light levels can be increased up to 600 µmol·m -2 ·s -1 as rooting increases and the cutting matures. Day length response: Facultative short day Daily light integral (DLI): 4–6 mol·m -2 ·d -1 for the first two weeks after sticking or until root development occurs. DLI can be increased to greater than 12 mol·m -2 ·d -1 after root formation. Media pH: 5.8–6.2 Media EC: SME EC: 0.9–1.3 mS/cm, PourThru EC: 1.4–2.0 mS/cm Fertilizer: Begin fertilization at 100 ppm nitrogen when roots become visible. Rates can be increased up to 200 ppm nitrogen after roots become well developed. Use primarily Cal-Mag ® (calcium nitrate + magnesium nitrate) fertilizers in propagation

to prevent unwanted stretch. Pinching: Not recommended

Plant growth regulators (PGRs): Miss Mandy has a moderately vigorous habit and may require a PGR treatment in propagation. If needed to control growth after rooting, sprays of B-Nine ® WSG (1,500 ppm) are usually sufficient. A tank-mix spray of Florel ® (350–500 ppm) + B-Nine ® WSG (1,500 ppm) can also be used to control growth and improve branching. Do not spray Florel ® on stressed or weak cuttings. 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.

Miss Mandy

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