|Forsythia with fasciated stem from a |
garden in Byfield. 19 May, 2013
The fasciation shown in my photograph is typical, with a flattened stem and fan-shaped leaf cluster. Sometimes a whole head of flowers may be affected, particularly among members of the Daisy Family, with remarkable consequences. By googling "fasciation" a range of these abnormalities may be viewed.
Various explanations for fasciation have been put forward with hormonal imbalance the most plausible suggestion but in fact a number of factors may be involved and research continues.