June 2021 - 34

CULTURE REPORT
Dahlia
'Sincerity'
Awarded for its
large pink and
white bicolor
flowers, 'Sincerity'
is a truly eyecatching
dahlia
perfect for
the landscape
and high-end
containers.
BY ALICAIN S. CARLSON AND CECILIA GUO
T
here are three words to describe
Sincerity Dahlia: Big, bold and beautiful.
Dense, naturally well-branched plants
make the perfect backdrop for the showy
blooms. 'Sincerity' is a picture-perfect choice for
the landscape and high-end patio containers.
Give it a try with these easy culture tips.
PROPAGATION
Stick cuttings into 105-cell propagation trays
or larger. Expect root emergence in eight to
10 days. Rooting hormone is not recommended,
but bottom heat for the first three weeks
will help ensure even, strong rooting. Media
temperatures of 70 to 74° F are recommended
and then low them to hold and tone cuttings. Air
temperatures between 72 to 74° F during the
day and 70 to 72° F at night are recommended.
Apply enough mist upon stick to rehydrate
the cuttings and keep them from wilting - they
should rehydrate within 24 hours. Cuttings
that are allowed to wilt heavily after stick will
34 JUNE 2021 GPNMAG.COM
callus unevenly and delay rooting. CapSil (spray
adjuvant) can be sprayed on the cuttings at 2 to
4 oz. /100 gal within one to two days of sticking
to help rehydration. Misting can be reduced
after cuttings have rehydrated.
Dahlias are facultative short day plants so
during propagation it is important to provide
long days (14 hours) either through day length
extension or night interruption to prevent
premature budding that can delay rooting. For
the first two weeks after sticking or until roots
form, a daily light integral (DLI) of 4 to 6 mols/
day is recommended and then light levels can
be increased to greater than 12 mols/day.
'Sincerity' should be fully rooted in about four
weeks in a 105-cell tray.
Recommended media pH and EC is 5.8 to
6.2 and 1.4 to 2.0, respectively (via PourThru
method). Fertilization should begin at 100ppm
nitrogen when roots become visible. Rates
can be increased up to 200-ppm nitrogen
after roots are well developed. It's best to
use primarily Cal-Mag Plus (calcium nitrate +
magnesium nitrate) fertilizers in propagation to
prevent unwanted stretch. Pinching is usually
not needed and not advised.
'Sincerity' has a moderately vigorous habit
and may require a PGR treatment in propagation
to reduce unwanted internode elongation.
If needed to control growth after rooting,
sprays of B-Nine WSG (1,500 ppm) are usually
sufficient. A tank-mix spray of Florel (350 to
500 ppm) + B-Nine WSG (1,500 ppm) can also
be used to control growth and further improve
branching. Do not spray Florel on stressed or
weak cuttings. For all sprays listed above, the
mist should be off for a minimum of one hour
for the PGR to absorb into the leaf tissue.

http://www.GPNMAG.COM

June 2021

Table of Contents for the Digital Edition of June 2021

June 2021 - 1
June 2021 - 2
June 2021 - 3
June 2021 - 4
June 2021 - 5
June 2021 - 6
June 2021 - 7
June 2021 - 8
June 2021 - 9
June 2021 - 10
June 2021 - 11
June 2021 - 12
June 2021 - 13
June 2021 - 14
June 2021 - 15
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June 2021 - 37
June 2021 - 38
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June 2021 - 40
June 2021 - 41
June 2021 - 42
June 2021 - 43
June 2021 - 44
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