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'Black Tea' rose Reviews & Comments
Discussion id : 120-668
most recent 24 MAR 20 HIDE POSTS
Initial post 24 MAR 20 by CybeRose
Journal of the Faculty of Science, Shinshu University 23(1): 61-67 (1988)
Studies on the Development of Black Brown Color in Rose Petals
Hitoshi Yasuda and Makoto Aoyama


Chemical and cytological investigations on the black brown color of rose petals were conducted using a cultivar Black Tea and some unnamed breeding lines, having the similar tinge in flower color.

1) Cyanidin and pelargonidin were detected as the major anthocyanidins in the petals, using the thin layer chromatography.

2) The ratios of pelargonidin to cyanidin contents in the petals were 1 to 1~10, estimated from the sizes of spots and shades of their colors on the chromatograms.

3) Microscopic observations on the fresh epidermis stripped off from the petals provide the following evidences:
(1) Central vacuoles showed an orange tone specific to pelargonidin glycosides.
(2) Some blue spherical bodies were recognized in the cells. The treatment with 0.1% hydrochloric acid brought about the color change of the bodies from blue to orange, being followed by oozing out some orange sap from the bodies.

4) The bodies were recognized microscopically as the homologous structures to the tannin body with the paraffin sections of epidermis, which were prepared by fixing in Kaiser's solution and stained with toluidine blue.

These results offered a new explanation that the black brown of petals such as Black Tea was given by the compound of two colors, one being orange of pelargonidin glycoside and the other being blue of the tannin body causing bluing effects in red petals.
Discussion id : 72-598
most recent 25 JUN 13 HIDE POSTS
Initial post 25 JUN 13 by Robert D.
We have one on the way from Rogue Roses in Medford Oregon. We're in Concord CA, east of San Francisco. Gets warmer and drier than the city, so we hope this one does well for us.
Discussion id : 32-825
most recent 3 JAN 09 HIDE POSTS
Initial post 2 JAN 09 by Rocky Tazawa
Mr.Kanjiro Okamoto,the breeder of 'Black Tea',was a directer of Keihan Gardening Co., Ltd in Japan.
'Black Tea' was breeded in Japan.
Reply #1 of 1 posted 3 JAN 09 by Cass
Thank you, Rocky.
Discussion id : 5-645
most recent 11 APR 05 SHOW ALL
Initial post 1 MAR 04 by Anonymous-9585
Can someone tell me the average size (height & width) of this rose. Also if anyone has any experience with the level of culture it requires, disease resistance, etc.
Thanks in advance
Reply #1 of 2 posted 25 MAR 04 by Anonymous-797
Requires lots of patience and some coddling to do well. Never very free with its blooms but there is no other cultivar in my experience that has the same coloring. My young plant is about 3 ft high by 2 feet wide.
Reply #2 of 2 posted 11 APR 05 by John Moody
Check out the rose O'rilla here on HMF as it too is a beautiful russet color. I love both of these roses and am trying to locate a source for this one.
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