Many sources have been consulted in the preparation of this work..
OUR IMPORTANT REFERENCES
The following references were the most important:
Armitage, A. M. (2001).
Armitage’s Manual of Annuals, Biennials, and Half-Hardy Perennials. Portland, OR:
Timber Press,Inc. Dirr, M. A. (1998).
Manual of Woody Landscape Plants: Their Identification, Ornamental Characteristics, Culture, Propagation and Uses (Fifth edition).
Champaign, IL: Stipes Publishing, L.L.C.
Hansen, R. & Stahl, F. (1993).
Perennials and Their Garden Habitats (Fourth edition). (Richard Ward Trans.) Cambridge, UK: Cambridge University Press.
Heger, M. & Whitman, J. (1998).
Growing Perennials in Cold Climates.
Lincolnwood (Chicago), IL: NTC/Contemporary Publishing Group, Inc.
Hillier, J. & Coombes, A. (Eds.). (2002).
The Hillier Manual of Trees and Shrubs: Completely updated and revised with 1,500 new plant entries.
Devon, UK: David & Charles.
Hortico, Inc. (2006). Rose Catalogue 2007.
Waterdown, ON: author.International Flower Bulb Centre.www.bulb.com
L. H. Bailey Hortorium. (1976).
Hortus Third: A Concise Dictionary of Plants Cultivated in the United States and Canada.
New York: Macmillan Publishing Company.
Pickering Nurseries. Roses. http://pickeringnurseries.com
Schreiner’s Iris Gardens. Online Iris Catalogue. http://schreinersgardens.com/
Stokes Seeds, Ltd. (2007). Stokes 2008 Growers Guide. St. Catharines, ON: author.
The Royal Horticultural Society. Horticultural Database. www.rhs.org.uk/
Valleau, J. M. (1998).
Perennial Gardening Guide:
The Authoritative North American Guide to Over 1500 Varieties of Perennials, Ferns, Grasses and Herbs. Abbotsford, BC: Valleybrook International Ventures, Inc.