Some trees under stress could be the reason behind large amounts of seeds on forest floors and lawns this spring — and the abundance of one ‘fluffy’ type has created an additional hazard for wildfires in Manitoba.
The City of Winnipeg said trembling aspen, the primary poplar variety in city forests, is producing more of the fluffy seeds than usual.
Photos show the seeds blanketing parts of Bridgewater Forest, and large patches of the seeds in several neighbourhoods have cropped up around the city.
The seeds may have caused trouble in the Assiniboine Forest fire, which saw crews work for two days to protect homes from spreading flames.
“The heavy seed load within Assiniboine Forest may have had an influence on the ease of ignition and speed which the fire was able to move,” said the city in a statement to CTV News.
The city said the seeds did not cause the fire and would have been only one factor in the spread of flames. The cause is believed to have been careless human activity, such as a bonfire or a cigarette.
A week later, firefighters north of Winnipeg in Traverse Bay battled a fire that saw about half a dozen cottages destroyed.
Fire Chief Brad Patzer said poplar fluff spread ambers and forced crews to chase after the seeds to help stop the wildfire.
University of Winnipeg forest ecology professor Andrew Park said the trees can produce millions of very light seeds that can blow long distances, and described them as ready-made tinder.
‘They’d be capable of igniting fires far from their point of origin,” said Park.
The seeds’ impact came as a surprise to life-long Winnipegger Brent Dilk.
“It looks like clouds,” he said Thursday night at The Forks, sitting beside a few mounds of the seeds.
“I didn’t realize it’s making fires.”
Elms also producing more seeds
Forest ecologist Andrew Park said that although elms normally produce a lot of seeds, the trees have been producing even more than usual this year.
He said the phenomenon happens about every seven to 12 years, depending on the species.
However, Park said, the increase in seeds will not correlate to the number of new elms sprouting in the city because most fall on sidewalks and roads and only a small percentage will grow into mature trees.
The city said Siberian elms appear to have a bit more seed production this year.
It said elms with bare branches should blossom in the coming weeks under normal conditions.
Why more seeds?
The City of Winnipeg said reasons for heavier seed production can be environmental stress in the previous year when the flower buds for the next year were developed.
“Winnipeg experienced drought in summer 2018 which could have contributed to the heavy seed production but the exact cause is difficult to determine,” the city said.
“Consecutive years of drought certainly has a negative impact on the trees.”
Homeowners are encouraged to water trees during dry periods.