Four Star Culture Guide - 2019 - 22

EUPHORBIA
Diamond

NUTRITION
pH: 5.8 - 6.2
EC: (2:1 extraction method) .6 - .9
Feed constantly at 150ppm - 200ppm nitrogen with a fertilizer
selected for grower's water quality and soil mix.
TEMPERATURE
Rooting out: 65 - 72 F
Growing on: 65 - 72 F
Holding: 60 - 65 F
WATERING
Maintain moderate soil moisture. 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
too dry or wilting will cause leaf yellowing and leaf drop.
TIMING
4" - 5"/Grande™: 4 - 6 weeks with one 104 cell plant.
6"/1GL Royale™: 6 - 7 weeks with one 104 cell plant.
8": 4 - 9 weeks with one to three 104 cell plants.
10" - 12" Hanging Basket: 9 - 12 weeks with three to five
104 cell plants.
PLANTING
The 104 Liner plants should be planted soon after arrival to
avoid severe drying and possible leaf loss. Plant into a welldrained soil mix and maintain a constant moderate soil moisture
level for the first seven to 10 days to establish new rooting.
Plants have been pinched and further pinching should not be
needed except for taller material at planting or a second pinch
for larger containers. This second pinch can be given for larger
containers, usually two to four weeks after planting. When
trimming/pinching Diamond Frost® and Diamond Mountain™,
do so carefully to only trim the uppermost portion of the plant.
Diamond Delight® should not need pinching when trimming off
the blooming portion of the plant. Trimming severely can
cause stunting of the plant with minimal new branching.
LIGHT/LIGHTING
These plants should be grown in a high light area of the
greenhouse for optimal flowering and plant development. The
three Diamonds flower very freely, and supplemental lighting
should not be required for early spring flowering. But, the plants
do perform much better in warmer and bright conditions.

GROWTH REGULATORS
If required, B-Nine® (daminozide) can be applied at 2,500ppm.
Florel® (ethephon) should not be applied to Diamond
Euphorbias for either branching or height control. Plants
treated with Florel will develop yellow leaves with leaf drop
following. Diamond Mountain is the most vigorous and will
require more PGR attention, followed by Diamond Frost. Diamond
Delight will probably require little or no PGR treatments.
PEST and DISEASE MANAGEMENT
There should be little instance of disease if basic cultural
guidelines are followed. Proper temperature, light levels,
and water management will eliminate most disease issues.
A broad spectrum fungicide such as Banrot® (etridiazole plus
thiophanate-methyl) can be applied at transplant, if desired.
Whiteflies can be a pest of concern. Overwatering can lead to
Fungus Gnat or Shorefly issues. Fungus Gnat larvae can damage
the root system of these plants.
OUTDOOR GROWING SCHEDULE
Euphorbias finish best in a controlled greenhouse environment,
but can be moved outdoors after threat of frost has passed and
weather is consistently warm (late May/early June in Michigan).
OTHER TIPS
Diamond Euphorbias perform best when grown warm, in a bright
location, with moderate soil moisture levels. Do not treat with
Florel. Apply oil-based pesticides carefully, as leaf damage and
yellowing can occur. B-Nine is a good PGR for growth control.
If needed, Bonzi® (paclobutrazol) can be used as a drench at
1/2ppm - 1ppm. Take care due to the strong effect delivered
to the plant and only trial on a small basis. Do not Bonzi drench
Diamond Delight.
Diamonds are also available as a Supernova Thriller™ 28 tray,
which is designed for possible fast finish in larger monoculture
containers and as the center "thriller" plant in combinations.
Diamond Mountain performs best in vigorous
combinations, Diamond Frost works best in averageto-more-aggressive vigor combinations, while
Diamond Delight is suited for average-to-less vigorous
combinations. Diamond Delight and Diamond Frost are
good for Grande™ or Royale™ container crops. Diamond
Mountain is best grown in Royale and large containers.

Four Star Greenhouse I www.pwfourstar.com I 734-654-6420
22

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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