color change in hydrangeas according to ph level nostalgichome.wordpress.com
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Color Change in HydrangeasAc
cord
ing
to p
H le
vel
nostalgichome.wordpress.com
HYDRANGEAS??
Hydrangea macrophylla is a the species of hydrangeas more commonly known as ‘bigleaf’.
The Bigleaf Hydrangea:• Can be found in local
gardening centers• Is a common decorative
plant• Grows best in morning
sun & afternoon shade• Produces blooms that
are pink, blue, or a mixture of both.
Blue or Pink?
Aluminum is the variable which changes the pH level in soil. The presence of aluminum lowers the pH level (blue blooms), while the lack of aluminum keeps the pH level higher on the scale (pink blooms).
pH 5.0-5.5 pH 5.5-6.5 pH 6.5+
SETUPLeft: Base - Pink - Dolomitic LimestoneCenter: Control - Pink & BlueRight: Acid - Blue - Aluminum Sulfate
METHODS→
MATERIALS ↓
1. Sun and shade2. Record pH levels3. Water with
solutions
3 Hydrangeas (pink)pH MeterDolomitic LimestoneAluminum SulfateTap Water
www.gandermountain.com/
Changes of pH Level in Soil8 Weeks
Week 1 Week 2 Week 3 Week 4 Week 5 Week 6 Week 7 Week 8
Acid 6.7 6.5 6.4 6 5.9 5.5 5.3 5.2
Base 6.6 6.6 6.7 6.7 6.8 6.6 6.7 6.7
Control 6.6 6.4 6.5 6.4 6.3 6 6 5.9
1
3
5
7
9
11
13
Chart Title
pH le
vel
Fina
l Res
ults
Left is the acidic
(blue)right is the alkaline
(pink).
Control plant has both blue and
pink blooms.→
Sources Cited1King, Judith. "Changing the Color of Hydrangeas." All About Hydrangeas.
Web. 2 Mar 2010. <http://www.hydrangeashydrangeas.com/colorchange.html>.
2King, Judith. "Planting and Transplanting Hydrangeas." All About Hydrangeas. Web. 2 Mar 2010. <http://www.hydrangeashydrangeas.com/planting.html>.
"Solutions." Modern Biology. Austin: Holt, Rinehart, and Winston, 2005. Print. "pH Preferences of Plants." GreenTerraFirma.com. 2007. Web. 3 Mar 2010.
<http://greenterrafirma.com/pH-preferences-of-plants.html>. "Life of the Garden Party." Southern Living. May 2010: 78-83. Print.
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