Roscoea

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Visit to the National Collection of Roscoea 17 th August 2011: On the 17 th August, Roland and Gay Bream kindly invited the Rock Garden Trials Assessment Panel to visit their National Collection of Roscoea. The collection consists of over 95 taxa, which are a mixture of species, hybrids and different cultivars. They are either scattered throughout the garden, planted under fruit trees, or in pots. Roland reported that his collection did very well in pots, and were very hardy, even in the winter 2010 – spring 2011, when temperatures reached -17 o C, the plants survived well. Roland reported that the only species that he did have trouble with, that proved to be fussier about its conditions and slightly less hardy than most was R. ganeshensis. Roland explained how he had become interested in the genus. When ordering plants from a catalogue, he decided to try something different that he had never tried before. The yellow flowers of R. „Kew Beauty‟ caught his eye in the catalogue. The following summer the plant successfully came up and continued to do well in his garden. Encouraged, Roland then tried other species as he came across them, and gradually became fascinated with the genus. Further reading: For more information of the Genus, as well as cultivation notes, please see the monograph by Jill Cowley. The Genus Roscoea (Kew Botanical Magazine Monograph). ISBN-10: 1842461346 Roscoea Trial No. 1436 2
Flowering times: Picture: These are the approximate flowering times for the different Roscoea species, with some example cultivars to show significant variations. The plants are listed in order of flowering. These are an amalgamation of the data collected in 2010 and 2011. The flowering times in 2010 were almost 2 weeks later than expected for the earlier flowering types (e.g. R. cautleyoides and R. humeana) as a result of the harsh winter, but this difference was lessened to a few days by the time entries such as the later flowering R. purpurea and R. ganeshensis come into bloom. Some plants will continue to flower into September, but the flower production will slow as the temperature starts to drop rapidly. Roscoea Trial 1436 3
Page 2 and 3: Trial of Roscoea 2008-2011 Entries
Page 4 and 5: R. cautleyoides 'Jeffrey Thomas' AG
Page 7 and 8: AGM’s to be reconfirmed: R. 'Kew
Page 9 and 10: R. purpurea f. rubra (syn. 'Red Gur
Page 11 and 12: Honourable mentions: The following
Page 13 and 14: The best time to move Roscoea is in
Page 15: suffer and produce few flowers. The
Page 19 and 20: Trial No. Award Plant Name Sender 4
Page 21: Source: Trials Office, The Royal Ho

Roscoea

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