| Hydrangeas Plus |
| Oregon nursery specializing in a large selection of species and cultivars of hydrangea. Includes images and information. |
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| Hydrangea Select |
| Hydrangea nursery with over 75 varieties in all colors. Climbing vines, shrubs, and tree varieties, along with how-to tips for growing successful hydrangeas. |
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| Gardens Galore |
| Information on the cultivation and pruning of woody plants in the weather conditions of County Cork, Ireland. Also listings and reviews of gardens open to the public in Cork. |
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| Pete's Hydrangeas |
| A place for hydrangea enthusiasts. Information about propagation, growing, drying, encouraging blossoms, and a forum. |
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| American Hydrangea Society |
| Dedicated to the study of the genus, species and cultivars, as well as culture, habits, and hardiness. Event schedule, new introductions, photographs and resources. |
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| American Camellia Society |
| Devoted to growing and propagating Camellias of all types; located at Massee Lane Gardens, host to the Festival of Camellias held each February. |
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| ColorChoice |
| A brand applied to cultivated varieties of flowering shrubs. Photos and descriptions of recent introductions, care information, and sources. |
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| Hydrangeum |
| Belgian Hydrangea society presents information about its collection and show garden, plant botany, and several illustrated articles. [Dutch/English] |
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| Gainesville Camellia Society |
| Florida organization offers membership information, schedule of programs and shows, seasonal culture guide, photo gallery of diseases, and miscellaneous articles. |
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| Azalea Society of America |
| Gives information about azaleas, "the royalty of the garden". There are azaleas for almost any growing situation you have, with almost any color, habit and height you desire |
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| Ocala Camellia Society |
| Affiliate of the American Camellia Society in Florida presents its meeting calendar, information and results of show, and officer roster. |
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| Wintergarden |
| Wholesale grower in Alabama provides some historical information on the use of camellias in US gardens and their winter features, as well as a listing of cultivars with photos and descriptions. |
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| Holly Society of America, Inc. |
| Society for people interested in hollies, including both novices and skilled growers, to exchange information through scientific studies, publications, meetings, visiting holly collections, and other educational activities. Includes information about various species. |
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| Atlantic Coast Camellia Society |
| Organization for camellia enthusiasts from Florida to Virginia, with annual meeting in South Carolina. Site hosts pages for several local societies. Schedule of shows, photo gallery, and membership information. |
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