Four Star Culture Guide - 2019 - 46

PELARGONIUM (GERANIUM)
Boldly®

NUTRITION
pH: 6.0 - 6.5
EC: (2:1 extraction method) .8 - 1.1
Constant feeding at 200ppm - 250ppm nitrogen with a fertilizer
selected for grower's water quality and soil mix is recommended.

Cycocel® (chlormequat) at 750ppm is recommended. Higher
rates can be used, up to 2,500ppm B-Nine and 1,000ppm
Cycocel, based on plant growth and temperatures. Smaller
containers such as 4", 4.25" Grandes™ and 5" pots may require
more PGR attention than larger containers.

TEMPERATURE
Rooting out: 68 - 72 F
Growing on: 68 - 72 F
Holding: 62 - 65 F

Geraniums are quite responsive to Florel® (ethephon) at
350ppm. It controls size early in the crop cycle and also
encourages additional branching. The 75 Liners have been
treated during their growing cycle and only larger containers
with longer crop times should be considered for additional Florel
treatments. Treatments for larger containers can be considered
two to three weeks after transplanting, when the plants are
well rooted and actively growing. No Florel treatment should be
made later than six to eight weeks before planned sale.

WATERING
Maintain moderate soil moisture. Allow the soil to cycle from
moist to slightly dry levels. Avoid both severe dry downs and
long periods of wet soil, especially in poor weather conditions.
Also avoid excessive soil moisture levels with freshly
transplanted plants.
TIMING
4" - 5"/Grande™: 5 - 6 weeks with one 75 cell plant.
6"/1GL Royale™: 7 - 8 weeks with one 75 cell plant.
8": 9 - 10 weeks with one 75 cell plant.
10" - 12" Hanging Basket: 10 - 12 weeks with three to four
75 cell plants.
PLANTING
The 75 Liner plants should be planted into a well-drained soil
mix selected to match individual water quality and fertilizer
blends. Plant the liners slightly below the soil level of the 75
cell plug. 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 for taller material at planting.
LIGHT/LIGHTING
Boldly® Geraniums should be grown in a moderate to high
light area of the greenhouse for optimal flowering and plant
development. Reduced light levels will delay flowering time and
flower coverage, and affect overall plant quality.
GROWTH REGULATORS
Growing at a moderate soil moisture level will produce a plant
that requires fewer PGR treatments. If required, a tank mix
spray application of B-Nine® (daminozide) at 1,250ppm and

PEST and DISEASE MANAGEMENT
There should be little instance of disease if basic cultural
guidelines are followed. Over-watering can lead to Botrytis,
Stem Rot, or Fungus Gnat issues. Control humidity levels,
supply moderate to high light, provide adequate spacing,
grow at moderate soil moisture levels, keep water off foliage in
poor weather conditions, and provide adequate air movement.
Aphids, Thrips, and Whiteflies can be pests of concern and
crops should be scouted on a regular basis.
OUTDOOR GROWING SCHEDULE
Boldly Pelargonium finish best in a controlled greenhouse
environment, but can be moved outdoors after all threat of
frost has passed (late May to early June in Michigan). This
recommendation is based on average spring weather and
should be adjusted for unseasonably severe or unseasonably
mild conditions.
OTHER TIPS
* Plant the 75's into their finished containers soon after
arrival. Delays in planting can cause lower yellow
leaves due to tight spacing and possible dry downs.
* Maintain soil pH levels of 6.0 - 6.5, provide moderate to high
light, supply proper spacing for best plant habit and health,
fertilize at a moderate to slightly higher rate, and do not grow
too cool. Growing too cool and too wet can greatly delay a
crop, cause undue stretching and reduce rooting.

Four Star Greenhouse I www.pwfourstar.com I 734-654-6420
46

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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