Four Star Culture Guide - 2019 - 8

ARTEMISIA
Silver Bullet®

NUTRITION
pH: 5.8 - 6.2
EC: (2:1 extraction method) .6 - .9
Constant feeding at 150ppm - 200ppm nitrogen with a fertilizer
selected for grower's water quality and soil mix is recommended.
TEMPERATURE
Rooting out: 66 - 70 F
Growing on: 60 - 68 F
Holding: 50 - 60 F
WATERING
Maintain moderate soil moisture. 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 soil drying can damage root
systems and cause leaf yellowing and loss of leaves within the
center of the plant.
TIMING
4" - 5"/Grande™: 4 - 5 weeks with one 104 Liner plant.
6"/1GL Royale™: 6 - 7 weeks with one 104 Liner plant.
8": 6 - 9 weeks with one to two 104 Liner plants.
10": 8 - 9 weeks with three 104 Liner plants.
PLANTING
The 104 Liner plants should be planted slightly deeper than
the liner root ball 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. The 104 Liner plants arrive already
pinched once. Additional pinching should not be needed except
in the case of taller material at time of planting or a second
pinch on plants for larger containers. This second pinch can be
given for larger containers, usually three to four weeks after
planting.

LIGHT/LIGHTING
Silver Bullet® Artemisias should be grown in a high to moderate
light area of the greenhouse for optimal plant development.
Additional lighting is not required.
GROWTH REGULATORS
Silver Bullet is a very vigorous variety. Cooler growing
temperatures, moderate soil moisture and fertility levels,
and proper spacing will all help reduce the need for a
PGR application. If required, a spray application of B-Nine
(daminozide) at 1,500ppm - 2,500ppm is effective.
PEST and DISEASE MANAGEMENT
There should be little instance of disease if basic cultural
guidelines are followed. Botrytis and Root Rot can occur in poor
growing conditions. Control excessive humidity levels in the
greenhouse and provide adequate air movement and space.
Whiteflies, Thrips, Aphids, and Spider Mites can be pests
of concern. Scout crops on a regular basis and use control
measures as needed.
OUTDOOR GROWING SCHEDULE
Silver Bullet can be finished outdoors as a second-to-move
outdoors crop. At Four Star (Michigan) we would consider
moving these plants outdoors in mid- to late April if weather
allows.
OTHER TIPS
High to moderately high light, moderate to cooler temperatures,
adequate spacing, moderate soil moisture levels, and moderate
nutrition are all crucial for producing quality Silver Bullet crops.
Silver Bullet can be grown at cooler temperatures than listed
above. If grown 5 degrees cooler than listed, at least one week
should be added to crop times.
Cooler growing will produce a more compact and well-branched
plant with less need for PGR treatments.
Care should be taken when growing cooler to also provide
adequate air movement and humidity control.
Plants can also be pinched and shaped as needed to produce a
high-quality plant with little or no PGR applications.

Four Star Greenhouse I www.pwfourstar.com I 734-654-6420
8

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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