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Hydrangeas for American Gardens
     

Hydrangeas for American Gardens

by Michael A. Dirr, Bonnie L. Dirr (Illustrator)
 

The sheer number of choices among Hydrangea species, hybrids, and cultivated varieties can be overwhelming even for the most advanced gardeners. How to choose from among the hundreds of mopheads, climbers, lacecaps, and oakleafs, to name just a few? And how to care for hydrangeas in American gardens, when nearly all the books offering advice about them

Overview


The sheer number of choices among Hydrangea species, hybrids, and cultivated varieties can be overwhelming even for the most advanced gardeners. How to choose from among the hundreds of mopheads, climbers, lacecaps, and oakleafs, to name just a few? And how to care for hydrangeas in American gardens, when nearly all the books offering advice about them come from England and Europe? Respected plantsman Michael A. Dirr comes to the rescue in this refreshingly forthright and practical guide to these distinctive shrubs and climbers.

Editorial Reviews

People Places Plants
"The book is filled with information and color images of hydrangeas taken by this accomplished plant photographer, augumented by beautiful botanical illustrations crafted by Dirr's wife, Bonnie. This book is a must for Dirr fans, and for those not yet exposed to his writing and photography, now is the time."

—Richard Churchill, People Places Plants, Summer 2005

Pacific Horticulture
"Dirr and his overstated opinions are always a pleasure to read, and this book does not deviate far from those expectations."

—Dan Hinkley, Pacific Horticulture, Spring 2005

American Gardener
"Hydrangeas for American Gardens totally seduced me. It is attractive enough to pick up, deep enough to take home, enthralling enough to take to bed, and by the morning light I wanted it to be mine forever."

—R. William Thomas, American Gardener, September/October 2004

Muskegon Chronicle

“[Dirr] brings the hydrangea story right up to the minute.”

Tulsa World
"This book will become the classic reference for these plants in American gardens."

—Russell Studebaker, Tulsa World, December 11, 2004

Dig: The Magazine for Northwest Gardeners
"Useful for gardeners at all levels of experience ... you'll find the answers in this book."

—Lynn Lustberg, Dig: The Magazine for Northwest Gardeners, September 2004

From the Publisher

“This is the book to have if you want the whole story about these beautiful plants.” —The Washington Post
 
“Dirr’s reigning expertise in the realm of trees and shrubs comes through once again.” —Booklist

“Definitive and irresistible tribute to one of America’s favorite shrubs.” —Publishers Weekly

“Gardeners will find useful advice about which varieties will perform best in their part of the United States.” —Library Journal

“Top honors for talent-spotting go to horticulturalist Michael A. Dirr, author of the invaluable Hydrangeas for American Gardens.” —Martha Stewart Living

“Dirr and his overstated opinions are always a pleasure to read, and this book does not deviate far from those expectations.” —Pacific Horticulture

“For Dirr fans, there is no question that this book is a must-read. For those not yet exposed to his writing and photography, now is the time.” —People Places Plants

“Speaks with authority and candor, making the entire book both educational and entertaining.” —National Gardener
 
“This book is both entertaining and authoritative.” —HortIdeas

“Hydrangeas for American Gardens totally seduced me. It is attractive enough to pick up, deep enough to take home, enthralling enough to take to bed, and by the morning light I wanted it to be mine forever.” —American Gardener
 
“The only up-to-date book on the subject.” —The Boston Globe

 

"Useful for gardeners at all levels of experience ... you'll find the answers in this book."
—Lynn Lustberg, Dig: The Magazine for Northwest Gardeners, September 2004

Product Details

ISBN-13:
9780881926415
Publisher:
Timber Press, Incorporated
Publication date:
06/15/2004
Pages:
236
Sales rank:
186,975
Product dimensions:
8.00(w) x 9.50(h) x 0.75(d)

Related Subjects

Read an Excerpt


Blue or pink colors are predicated on the amount of aluminum in the soil solution which can be absorbed by the roots. Although pH is often listed as the agent of color change, it is actually an instigator of (a precursor to) the process. If soils are acid, aluminum is available; if more alkaline, then aluminum is tied up in insoluble forms and not readily available for uptake. So the true story is that high acidity, i.e., low pH, solubilizes (or makes available) aluminum; the reverse occurs at low acidity (high alkalinity), i.e., high pH. Excess phosphorus in the soil will also tie up the aluminum in insoluble precipitates, even in acid soils. Hydrangea macrophylla grown in pine bark medium, pH 5 to 6, are typically pink. Why? The acidity is high, but almost no aluminum is present in the substrate (bark). Soil is composed of minerals, typically aluminum, silicon, iron, etc., and therein resides the difference. So how do growers produce blue hydrangeas in pine bark? Aluminum sulfate is added to the surface of the container at a prescribed rate, usually 0.75 to 1.5 ounces evenly distributed on the surface of the 3-gallon container medium. Greenhouse growers also apply it as a drench at the rate of 2.4 ounces per gallon solution with 8 ounces applied as a drench per 6-inch container. Greenhouse treatments start at budbreak and continue every 2 weeks for three additional applications. Growers have variable timetables for application but in our work as soon as flower buds are visible, a single application at the 1.5 ounce rate per 3-gallon is made. Water thoroughly after application to ensure solubilization of the aluminum and movement into the root zone. Too much is worse than too little: I have dwarfed and killed plants with excessive applications. Hydrangea macrophylla displays a high tolerance to aluminum. Research showed that aluminum complexes with citric acid in the cell sap and may be detoxified in this manner.

Occasionally, elemental sulfur (flowers of sulfur) is recommended for acidifying the soil and thus mobilizing (solubilizing) aluminum. This is a borderline crazy approach and slow to effect the desired change. If the soil pH is high, live with pink, rose, and red hydrangeas — they are beautiful — or create raised beds, laden with acid organic matter, and apply aluminum sulfate that over time will lower pH and supply aluminum for ready blueing. Hydrangea macrophylla or H. serrata, in any shade of pink to red, is satisfying. Consider nature's gift to the garden, accept and enjoy. On the other hand, if soils are acid as lemons, lime may be added to raise the pH if pink, rose, and red flowers are desired.

Meet the Author


Michael A. Dirr is widely acknowledged as the leading expert on trees and shrubs for landscapes and gardens. During his nearly three decades as a professor of horticulture at the University of Georgia, he received the highest honors from the American Horticulture Society, the Garden Club of America, and the American Society for Horticultural Science, among others. Dirr currently is a partner in Plant Introductions, Inc., and has introduced many trees, shrubs, and vines throughout his career. He is the author of Viburnums, Hydrangeas for American Gardens, and The Reference Manual of Woody Plant Propagation, all from Timber Press.
 

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