Four Star Culture Guide - 2019 - 84

HYDRANGEA ARBORESCENS
and PANICULATA
ZONE HARDINESS
3 - 8 H. paniculata
3 - 9 H. arborescens
NUTRITION
pH: 5.6 - 6.2
EC: (2:1 extraction method) 0.6 - 0.9
Moderate to high fertilization is recommended: 150ppm -
300ppm N. Soil pH may not influence flower color, but proper
soil pH levels must be maintained to avoid iron deficiency
symptoms in the foliage.
TEMPERATURE for forcing from liners
Forcing/Growing on: 65 F Night - 72 F Day
Holding: 40 F Night - 50 F Day
Once plants reach a saleable size, they can be moved to a frost
protected open environment with good air movement to assist
in strengthening the stems.
WATERING
Moderate to moist: Water thoroughly without over-saturating,
keep consistently moist but not wet throughout entire growth
cycle.
TIMING
28 Liner to True 1 Gallon: 12 - 14 weeks with one plug per
container. A planting date for spring finishing would be Week
6 for finishing in Week 18 - 20. However, planting a 28 count
liner in the spring can be difficult to provide the bulk and flower
show needed to compare with nursery grown material. We
recommend planting these in the late summer/fall and doing
additional bulking and trimming prior to dormancy.
Quick Turn™ Liner to True 1 Gallon: 12 - 14 weeks with one
plug per container. A typical planting date for spring forcing
would be Week 6 for finishing in Week 18 - 20. Planting a Quick
Turn in Week 18 for finishing in Week 28 is also achievable.
Quick Turn Liner to 2 - 3 Gallon: 16 - 22 weeks with one
plug per container. Planting a Quick Turn liner into a 2 - 3 gallon
container and bulking in the summer is also a great way to
finish a larger high-quality spring crop.

VERNALIZATION
Providing long days are present, vernalization is not needed for
flowering. Arborescens and paniculata will flower on new wood
after a light prune. Allow at least 8 - 10 weeks after trimming
for late summer/fall flowering.
PLANTING
Hydrangea arborescens and paniculata perform best when
planted in a well-drained, porous growing medium.
When growing shrubs, we recommend using an aged or
composted pine bark-based media as opposed to annual
growing mixes that traditionally tend to be heavier in peat. Bark
adds weight and stability to the growing mix and tends not to
compress and shrink over time, thus adding the longevity that
can be needed on long-term crops such as shrubs.
LIGHT/LIGHTING
During early spring forcing, plants should be given long days
and as much light as possible. Poly grown plants will have
lighter colored foliage. Crops should be spaced such that they
do not shade each other. Unspaced plants can stretch, require
additional pruning, and lead to an undesirable look on the retail
bench.
Light shading can be beneficial in the summer heat as Hydrangea
can sometimes struggle and burn in really hot locations.
TRIMMING/PINCHING
Frequent pruning in the summer and fall will produce a tightly
mounding product the following spring, which will have a
more sturdy look and a longer shelf life at retail. If the plants
don't sell during their flowering time, they can be shaped up as
needed to remove spent flowers and improve their appearance
for continued summer sales.
GROWTH REGULATORS
H. Paniculata
Cultural practices such as cooler holding temperatures, proper
spacing and good air movement in an open environment can
help control plant height, strengthen stems, and assist in
finishing a high quality crop. During forcing in a greenhouse in
early spring, the use of 5ppm Sumagic® (uniconazole) sprays
can be helpful for H. paniculata. See below for H. arborescens
PGR recommendations.

Four Star Greenhouse I www.pwfourstar.com I 734-654-6420
84

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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