Hydrangeas for American Gardens

Hydrangeas for American Gardens

by Michael A. Dirr, Bonnie L. Dirr
     
 

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

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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

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

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

Product Details

ISBN-13:
9780881926415
Publisher:
Timber Press, Incorporated
Publication date:
06/15/2004
Pages:
236
Sales rank:
411,052
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.

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Meet the Author

Michael A. Dirr is a professor of horticulture at the University of Georgia. He is the author of twelve books, including Dirr's Hardy Trees and Shrubs: An Illustrated Encyclopedia and the text and reference book, Manual of Woody Landscape Plants, and has published more than 300 scientific and popular papers and articles. His teaching, lectures, seminars, garden study tours, and plant introduction programs have contributed enormously to greater horticultural awareness. He has received the highest teaching and gardening awards from the University of Georgia, American Society of Horticultural Science, American Horticultural Society, American Nursery & Landscape Association, Massachusetts Horticultural Society, Southern Nursery Association, and Garden Club of America.

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