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Margaret R. Pooler

The U.S. National Arboretum has released over 650 new plant cultivars since it was established in 1927. A key to the success of the plant breeding program has been the voluntary participation of universities and private nurseries in evaluating and propagating new plant material. The cooperative evaluation and stock increase programs play a critical role in the successful testing, introduction, and distribution of new cultivars of landscape trees and shrubs. These integrated cooperative programs depend on the involvement of nurserymen, researchers, botanic gardens, or individuals to evaluate potential new cultivars under diverse climatic conditions and hardiness zones, and wholesale propagation nurseries to increase stock of those cultivars destined for release.

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Rafael A. Muchanga, Toshiyuki Hirata, and Hajime Araki

stock, averaged across years, soil N stock increased by 15%, 7.3%, 5.5% in the compost, HV, and HV + compost treatments, respectively, than in the bare treatment. It is noteworthy that there was a significant increase in soil N stock from 2016 to 2017 in

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Margaret R. Pooler

ornamental plants released from the National Arboretum, ‘Dream Catcher’ and ‘First Lady’ are not patented, so they may be propagated and sold freely. Stock increase of these plants by cooperating wholesale nurseries was initiated in 1998 and 2003

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Timothy A. Rinehart, Ned C. Edwards, and James M. Spiers

parts of the Gulf Coast region. Availability ‘Anna Bella’ was released by the USDA Agricultural Research Service and is not patented. It may be propagated and sold freely. Stock increase by specialty nurseries was initiated in 2009 and propagated plants

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Iftikhar Ahmad and John M. Dole

, continuous use of C-IS increased petal fading of cut stems of lisianthus and zinnia, but decreased fading of snapdragon and stock. Increase in petal fading might be associated with longer vase life of cut stems kept continuously in solutions containing C