Four Star Culture Guide - 2019 - 26

HELICHRYSUM
Licorice, Icicles

NUTRITION
pH: 6.0 - 6.4
EC: (2:1 extraction method) .6 - .9
Constant feeding at 100ppm - 150ppm nitrogen with a fertilizer
selected for grower's water quality and soil mix is recommended.
Avoid high fertility levels and low soil pH conditions.
TEMPERATURE
Rooting out: 68 - 72 F
Growing on: 68 - 72 F
Holding: 65 - 68 F
WATERING
Control moisture levels and grow moderate to slightly dry to
control plant growth. After rooting into the finished container,
allow the soil to cycle from moist to slightly dry. Avoid both
severe dry downs/wilting and long periods of wet soil,
especially at cooler temperatures. Growing too wet early in
the production cycle can cause disease issues while severe
wilt conditions can damage root systems and lower foliage.
TIMING
4" - 5"/Grande™: 4 - 6 weeks with one 104 Liner plant.
6"/1GL Royale™: 5 - 7 weeks with one to two 104 Liner plants.
8": 6 - 8 weeks with one to two 104 Liner plants.
10" - 12": 8 - 11 weeks with three to five 104 Liner plants.
PLANTING
After receiving plants, transplant them as soon as possible.
Lower older foliage on Lemon, Licorice Splash, and White may
have some dried and damaged leaves. This is caused by the
"shock" of moving from propagation to growing areas. The
plants have been preventatively treated, and no disease should
be present. The 104 Liner plants should be planted at the same
level as the top of the 104 cell or only slightly deeper 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. Watering
lightly and more frequently will best establish rooting into
the finished container and avoid transplant shock. The plants
have already been pinched once during the 104 tray production
cycle. Pinching should not be needed except in the case of taller

material at time of planting or for larger containers. A second
softer pinch can be performed as needed for larger containers,
typically to shape the plant. Pinching should be avoided until
plants are well rooted into the finished container.
LIGHT/LIGHTING
Helichrysum should be grown in a moderate light level area of
the greenhouse for optimal plant development and branching.
Greenhouse areas with slightly lower light levels can also
be used if proper temperature, humidity, air movement, and
watering practices are supplied. Helichrysum should not require
daylength or supplemental lighting.
GROWTH REGULATORS
Growing under proper light conditions, with adequate spacing,
moderate soil moisture levels, and recommended temperatures
will produce the highest quality plants and lower the need for
PGR treatments.
If required, a spray application of B-Nine® (daminozide) at
2,500ppm is effective.
PEST and DISEASE MANAGEMENT
With proper growing conditions and water management,
disease issues should not be a problem. Control excessive
humidity levels in the greenhouse, provide good air movement,
do not overfertilize, maintain proper soil pH levels, and provide
adequate space. Watch for Powdery Mildew and Botrytis.
OUTDOOR GROWING SCHEDULE
Helichrysums are moderate heat-loving plants and should be
grown outdoors only after the danger of frost has passed and
temperatures have warmed. Foliage can be damaged from a
very light frost or chilling temperatures. At Four Star we only
move these crops outdoors in mid-May if weather allows.
OTHER TIPS
For proper plant growth and desired finished quality, supply
lightly shaded to moderate light conditions in the greenhouse,
moderate temperatures, adequate spacing, managed moisture
levels, and moderate nutrition levels. These crops are quite
vigorous and require some extra care until well established in
their finished containers. Plants should be scheduled and grown
in time frames that supply these requirements.

Four Star Greenhouse I www.pwfourstar.com I 734-654-6420
26

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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Four Star Culture Guide - 2019 - Contents
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