Four Star Culture Guide - 2019 - 28
IMPATIENS (DOUBLE)
Rockapulco®
NUTRITION
pH: 5.8 - 6.2
EC: (2:1 extraction method) .6 - .9
Constant feeding at 125ppm - 150ppm nitrogen with a
fertilizer selected for grower's water quality and soil mix is
recommended. If possible, avoid mixes containing high levels of
ammoniacal nitrogen and phosphorus.
TEMPERATURE
Rooting out: 65 - 72 F
Growing on: 65 - 72 F
Holding: 60 - 65 F
WATERING
Maintain moderate to slightly dry soil moisture levels. Allow
the soil to cycle from moist to dry. Avoid both severe dry
downs/wilting and long periods of wet soil, especially at cooler
temperatures. Growing at lower moisture levels can be beneficial
toward producing a more compact plant with fewer PGRs
required. Plants can be allowed to show slight signs of moisture
stress before watering. When watering, do so lightly so moisture
reaches the bottom of containers, but not to the point of saturating
the soil. This practice can also be used to help "hold" plants.
TIMING
4" - 5"/Grande™: 4 - 5 weeks with one 104 Liner plant.
6"/1GL Royale™: 7 - 8 weeks with two 104 Liner plants.
8": 8 - 9 weeks with two to three 104 Liner plants.
10" - 12" Hanging Basket: 9 - 12 weeks with three to five
104 Liner plants.
PLANTING
The 104 Liner plants should be planted at or slightly deeper
than the liner cell level into a well-drained soil mix selected to
match individual water quality and fertilizer blends. Water in
thoroughly without saturating the mix and maintain a constant
moderate soil moisture level for the first seven to 10 days to
establish new rooting. Pinching should not be needed, except in
the case of taller material at time of planting.
LIGHT/LIGHTING
Rockapulco® Double Impatiens should be grown in a moderate
light area of the greenhouse for optimal plant development.
Growing in a more shaded area will produce taller and softer
growth that is less attractive and more disease prone.
Additional lighting is not required for flowering.
GROWTH REGULATORS
If required, a light spray of Bonzi® (paclobutrazol) at
2ppm - 5ppm is effective. Other materials such as
Sumagic® (uniconazole), Topflor® (flurprimidol), and Piccolo®
(paclobutrazol) can be used at rates that correspond with the
degree of treatment recommended for Bonzi, but should be
trialed to match individual growing conditions. Drier growing
practices and controlling fertilizer levels can be very helpful at
managing plant size and encouraging flowering. Higher spray
rates of Sumagic (10ppm - 15ppm) may be required if plants are
grown under lower light levels and/or kept too moist.
PEST and DISEASE MANAGEMENT
There should be little instance of disease if basic cultural
guidelines are followed. Provide adequate space, humidity
control, and air movement to prevent Botrytis and other fungal
disease. Avoid long periods of moisture on the foliage, especially
in poor weather conditions. All liners are treated twice during
the growing cycle to preventatively treat for Downy Mildew.
Again, providing a proper greenhouse environment and watering
practices will control this disease in the greenhouse. During the
production cycle, a preventative fungicide treatment of a copper
product or Alude™ can be considered.
Thrips, Aphids, and Fungus Gnats can be pests of concern.
Scout specifically for Thrips - they can spread INSV (Impatiens
Necrotic Spot Virus).
OUTDOOR GROWING SCHEDULE
Rockapulco should be grown outdoors only after the danger of
frost has passed (mid- to late May in Michigan). The foliage can
be damaged from a very light frost. These recommendations
are based on average spring weather and should be adjusted
for unseasonably severe or unseasonably mild conditions.
OTHER TIPS
Rockapulco Double Impatiens can be grown much like
seed Impatiens. Provide moderate light and moderate levels
of fertilizer, grow on the drier side, and provide adequate space
and good air movement to produce the highest quality plants.
Four Star Greenhouse I www.pwfourstar.com I 734-654-6420
28
The rates and chemicals listed are based on our southeast Michigan growing conditions, and are not recommended for nationwide application.
Please adjust the rates and spray applications to your location and facility.
http://www.pwfourstar.com
Four Star Culture Guide - 2019
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