Four Star Culture Guide - 2019 - 88

HYDRANGEA

Color Change Guide
Although we occasionally hear from a gardener who wants
to shift his or her hydrangeas from blue to pink, we most
frequently have requests to turn pink hydrangeas blue. Many
growers and retailers find that blue-flowered hydrangeas sell
more quickly than pink and thus want a protocol to have lush
blue blooms on plants. Here are our observations:
* Be sure you're working with the right kind of hydrangea. Only
H. macrophylla and H. serrata can be manipulated to change
their flower color. Not all cultivars are equally capable of
color change, and white-flowered varieties will not change
color at all.
* Aluminum availability determines flower color. Although soil
pH is traditionally credited with turning hydrangeas pink or
blue, it is actually the aluminum that causes the change. If
aluminum is present in the soil, the flowers will be blue. In the
absence of aluminum, the blooms will be pink. However, the
soil pH controls the availability of aluminum for plant uptake,
and aluminum is freer in the soil under acidic conditions. Both
conditions: the presence of aluminum and acidic soil must be
true for flowers to blue.

LET'S DANCE® BLUE JANGLES ®

* Color changes need time to take effect. It can take a full
season or more to shift a plant from pink to blue. In the
landscape, gardeners may see a gradual or "tie-dye" effect
if they scatter soil amendments in their hydrangea beds. This
can be quite pretty, but consistent treatment is necessary to
get a true blue (or pink).

Four Star Greenhouse I www.pwfourstar.com I 734-654-6420
88

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

Table of Contents for the Digital Edition of Four Star Culture Guide - 2019

Contents
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Four Star Culture Guide - 2019 - Contents
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