It is all a question of the quantity of such occuring....But as they also measured the ground around those daisies which was found to be contaminated 0.5 µSv there is a good chance that it is mutation caused indeed by radiation and just NOT fasciation, fact which is omitted in the Christian Science Monitor article but which is mentioned in the original article of Fukushima Diary on July 7, 2015.
This is the original picture of the Fukushima Diary article
Which was somehow omitted and substituted by the Christian Science monitor for this one
Residents of Japan's Nasushiobara City have been posting images of the deformed daisies that some believe may be linked to the 2011 meltdown of the Fukushima nuclear power plant.
Trees and flowers can act as Mother Nature’s version of a canary in a coal mine, an alarm system giving off warnings – ia size, shape, color, splitting, or stacking – that toxins are present in our immediate environment.
Or they could just have a hormone imbalance, says Todd Forrest, the New York Botanical Garden’s vice president for horticulture, says in an interview. The fairly common deformities showing up near Fukushima could easily have been caused by a random mutation, insects, diseases, or even physical injury to the plant, he says.
In other words, doubled flower heads are no reason to call the Environmental Protection Agency (EPA), according to Mr. Forrest.
"Fasciation is a relatively common occurrence in the garden world," he says. Fasciation is the technical term for banding or bundling, and can result in a flower stem that looks flattened, splayed, or fused – ranging from the grotesque to the sublimely interesting.
"Radiation being present in the environment is a plausible explanation," says Forrest, "but not necessarily the only explanation for the phenomenon."
Many of the daisy images are coming from& Fukushima Diary, a popular site on Pinterest showing images of doubled daisies, roses and sunflowers.
The Christian Science Monitor