January 2025 - 52

CULTURE REPORT
important. Weekly calcium foliar sprays from calcium
chloride are beneficial to encourage strong growth,
prevent leaf edge burn and prevent bract edge burn. A
small portion of the crop should be tested 3-4 days prior
to spraying the entire crop. To increase stem elongation,
increase phosphorus by approximately 10 ppm.
Temperatures should be maintained between 68-78° F
(days) and 65-70° F (nights). Temperatures can be
manipulated to regulate growth. Positive DIF can be
utilized to increase stem elongation. Negative DIF can be
utilized to slow stem elongation.
Height control is important to prevent internode stretch
or promote stem elongation to reach desired height. There
are programs available to assist with height tracking,
such as OnTarget: Graphical Tracking. Decisions regarding
cultural manipulations such as DIF, additional spacing,
growing temperatures, etc. or the use of chemical PGRs may
be made based on understanding the actual plant growth
and estimated growth potential for the crop. It is important
that PGRs are mixed and applied at appropriate rates and
dates to avoid distortion of bract size or color development.
Chemical PGRs can be applied during the vegetative
growth stage to promote final plant height specifications.
Sprays can cause significant bract regreening when
applied just before and during early bract development.
Bract regreening is much less likely to occur with
drenches. Ensure thorough application and drench along
with 200-250 ppm N from a 20-10-20 formulation. For
each additional 1 ppm of GA4A7, 6-BA applied, 1-2
inches of additional stem elongation can be expected.
FLOWER INITIATION
Temperatures below 65° F in September encourage
flower induction, while night temperatures above 70° F
delay induction. Shading of crops may be utilized to create
artificial short days and initiate flowering early. Crops
should be shaded for a minimum of 12 hours to achieve
a flower initiation response. Be aware of light pollution
sources that can negatively affect flower induction. If light
pollution is a problem, shading must continue until 25%50%
flower color.
QiuXia Chen is product manager, potted plants and trial
manager for Dümmen Orange. She is also one of GPN's
Forty Under 40 award winners in 2024 and can be reached
at q.chen@dummenorange.com.
52 JANUARY 2025 GPNMAG.COM

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January 2025

Table of Contents for the Digital Edition of January 2025

Table of Contents
Editor's Report
Intern of the Year | Theodore Salgado
Technology | When are the robots coming?
Labor | Must-have heat safety measures
Trends | A rosy outlook for foliage
CEA | USDA grants for energy efficiency in your greenhouse
Management | Bring on the dragons
Big Grower | Walters Gardens
SGAFT | Sidewall winterization for small greenhouses
Culture Report | Poinsettia 'Red Ribbons'
Forty Under 40 Perspectives | Irrigation at a large container farm
AmericanHort | Top 10 ways you can thrive in 2025
Product Marketplace
Industry News
Events
Classifieds/Ad Index
January 2025 - 1
January 2025 - 2
January 2025 - Table of Contents
January 2025 - Editor's Report
January 2025 - 5
January 2025 - Intern of the Year | Theodore Salgado
January 2025 - 7
January 2025 - 8
January 2025 - 9
January 2025 - 10
January 2025 - 11
January 2025 - 12
January 2025 - 13
January 2025 - Technology | When are the robots coming?
January 2025 - 15
January 2025 - Labor | Must-have heat safety measures
January 2025 - 17
January 2025 - 18
January 2025 - 19
January 2025 - Trends | A rosy outlook for foliage
January 2025 - 21
January 2025 - 22
January 2025 - 23
January 2025 - 24
January 2025 - 25
January 2025 - 26
January 2025 - 27
January 2025 - CEA | USDA grants for energy efficiency in your greenhouse
January 2025 - 29
January 2025 - 30
January 2025 - 31
January 2025 - Management | Bring on the dragons
January 2025 - 33
January 2025 - 34
January 2025 - 35
January 2025 - Big Grower | Walters Gardens
January 2025 - 37
January 2025 - 38
January 2025 - 39
January 2025 - 40
January 2025 - 41
January 2025 - SGAFT | Sidewall winterization for small greenhouses
January 2025 - 43
January 2025 - 44
January 2025 - 45
January 2025 - 46
January 2025 - 47
January 2025 - Culture Report | Poinsettia 'Red Ribbons'
January 2025 - 49
January 2025 - 50
January 2025 - 51
January 2025 - 52
January 2025 - 53
January 2025 - Forty Under 40 Perspectives | Irrigation at a large container farm
January 2025 - 55
January 2025 - AmericanHort | Top 10 ways you can thrive in 2025
January 2025 - 57
January 2025 - Product Marketplace
January 2025 - 59
January 2025 - 60
January 2025 - 61
January 2025 - 62
January 2025 - 63
January 2025 - Industry News
January 2025 - Events
January 2025 - Classifieds/Ad Index
January 2025 - 67
January 2025 - 68
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