The World Of Magnolias

Overview

An up-to-date encyclopedic reference to all known species, with the most complete listing of cultivars yet published. Since most magnolias are highly ornamental their garden use is a primary focus of the book, though every aspect of magnolias from history to hybridizing is treated.

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Overview

An up-to-date encyclopedic reference to all known species, with the most complete listing of cultivars yet published. Since most magnolias are highly ornamental their garden use is a primary focus of the book, though every aspect of magnolias from history to hybridizing is treated.

Read More Show Less

Product Details

  • ISBN-13: 9781604692266
  • Publisher: Timber Press, Incorporated
  • Publication date: 7/16/2010
  • Pages: 310
  • Sales rank: 1,197,111
  • Product dimensions: 8.25 (w) x 11.00 (h) x 0.65 (d)

Meet the Author

Dorothy J. Callaway was born in Alabama and grew up in Bishop, Georgia. She was exposed to natural history (plant science in particular) at an early age through her parents. She attended the University of Georgia, Athens, Georgia, and received a B.S. in horticulture, followed by an M.S. in botany from the L. H. Bailey Hortorium at Cornell University, Ithaca, New York. Her thesis research involved the taxonomic study of magnolias cultivated in North America. Since then she has written a number of articles on magnolias for major botanical and horticultural journals. Her aims in writing this book are to compile scattered information into a single reference and to introduce others to the fascinating variety of the genus. Dorothy Callaway has served as the official registrar for magnolia cultivars and as a member of the board of trustees of the Magnolia Society, Inc.

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Read an Excerpt

Once established, magnolias need minimal care to become beautiful landscape plants. They should be irrigated as needed, but should not be overwatered. A good layer of mulch around the tree at all times will help keep the soil moist and reduce weeds. Digging or hoeing around magnolias is not advisable since surface roots are easily damaged by hoes and shovels. Chemical weed killers should also be used with caution as the herbicide may easily reach the shallow roots. As with all trees, lawnmower damage to the trunk will allow entry of diseases as well as produce unsightly scars. A mulched area around the trunk of the plant should eliminate the need for invasive weeding or close mowing.

Soil fertility should be maintained by the addition of fertilizers when necessary. Fertilizer formulations containing lime should be avoided to keep from raising the soil pH. Application of ferilizer may continue into the summer if necessary, but should be discontinued after the end of July to allow the plant growth to harden off before winter. Fertilizer should not be placed near the trunk itself. Plant roots are concentrated away from the trunk, at a distance roughly equal to the "drip line" or edge of the branch canopy - it is there that fertilizer should be applied.

Some attention has been given to foliar application of fertilizer in magnolias. Smithers (1977) and Adams (1984) reported excellent results with a weekly or biweekly foliar application of macro- and micronutrients throughout the summer. Foliar sprays reportedly decrease heat stress of plants as well as provide nutrients in readily available form. Continuous vigorous growth was reported throughout the summer and was most noticeable onplants that had also received foliar feeding the previous year. Better root growth was noticed in treated plants after just one season. Foliar spraying is best done in the evenings to avoid leaf burn, and should be discontinued in the fall to allow time for the plants to harden off. Adams (1984) provides information on price and availability of foliar fertilizers as well as practical information on their use.

Pruning is usually not necessary in magnolias, but may be performed as with most woody plants. Certainly misshapen plants can be pruned to create a better form. Suckers from the understock of a grafted plant need to be removed as soon as they are noticed, regardless of season. Also remove unwanted leaders, keeping only those that are appropriate to shape and height requirements. Any weak, dead, or diseased branches can also be pruned out. Precocious species may be pruned in the summer after blooming has ceased. Summer-flowering species are best pruned in late winter.

Root pruning is sometimes advocated as a means of restricting the growth of a large specimen. This may be done during the dormant season by using a shovel to sever the roots about a yard (1 m) from the trunk of the plant. If restricting a plant's growth is necessary, this is a reasonable way to do it; however, it is preferable to avoid the need to do so by carefully siting all plantings. Some gardeners report using this procedure as a method to hasten flowering time. I do not recommend this. The earlier flowering is the plant's reaction to induced stress (the reduced root system) and is not beneficial in the long run.

Photo above: Magnolia 'Orchid' - Photo by Dorothy J. Callaway.

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