What are these trees?

poplars
alders
aspens
willows
Willows are very fast growing trees. One of the species, called energy willow, is grown as a source of biomass.
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Very interesting!
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Answers by country

poplars
alders
aspens
willows
answers
flagthe United Kingdom
8%
4%
4%
82%
23
flagAustria
0%
0%
20%
80%
10
flagPoland
9%
7%
7%
75%
9783
flagGermany
12%
1%
10%
75%
57
flagthe United States
6%
6%
13%
68%
29
flagIndia
16%
16%
12%
54%
31
flagUkraine
20%
10%
20%
50%
10
flagRussia
30%
15%
7%
30%
26
flagItaly
22%
16%
33%
22%
18