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
flagAustralia
6%
0%
0%
93%
16
flagthe United Kingdom
8%
5%
5%
80%
36
flagPoland
9%
7%
7%
75%
10028
flagGermany
12%
2%
9%
74%
77
flagAustria
0%
0%
26%
73%
15
flagGreece
0%
6%
20%
73%
15
flagthe United States
7%
7%
12%
69%
39
flagIndia
15%
21%
10%
52%
38
flagUkraine
15%
23%
15%
46%
13
flagRussia
32%
16%
8%
29%
37
flagItaly
34%
26%
17%
17%
69