Rhododendron Bloom Brings Spring Forward

The flowering season of the Himalayan rhododendron has moved forward by three months in response to climate change.

The rhododendron, one of the most popular and colourful small evergreen trees grown in gardens and parks across the world, is changing its flowering season from spring to winter in its native Himalayan habitat.

The blooming of rhododendron, with their conspicuous displays of deep red or pale pink flowers, has always heralded the arrival of spring in the Himalayas, but this has undergone a dramatic change. Peak flowering season is now early February to mid-March, instead of the spring months from March to May.

A group of scientists at the GB Pant Institute of Himalayan Environment and Sustainable Development in Almora, India, studied the change in flowering times of the native Rhododendron arboreum to see if they could relate it to climate change.

Temperature data
They report in Research Communications journal that they analyzed the long-term temperature data of the region for the previous 40 years (1971-2011) and found a comparatively small but significant increase in mean maximum temperature of 0.5°C over the period.

Using real time observations in three seasons, 2009 to 2011, and long-term herbarium records from 1893 to 2003, the scientists concluded that the peak flowering of the tree had moved forward three months – by between 88 and 97 days, depending on the recording site.
...
Dr Ranbeer S Rawal, who led the research, says alterations in the phenological activity of organisms had been shown by science to be the result of unusually warm temperatures, caused by human-induced climate change.

Phenology is the study of the times of recurring natural events, especially in relation to climate. The phenological responses of plants, particularly early flowering, are considered important biological indicators of climate change, and the rhododendron results were among the most dramatic.

Read more at Himalayan Bloom Brings Spring Forward