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
7%
7%
7%
77%
40
flagFrance
7%
15%
0%
76%
13
flagPoland
9%
7%
7%
75%
10129
flagGreece
0%
6%
20%
73%
15
flagGermany
11%
4%
9%
72%
92
flagthe United States
7%
7%
11%
71%
42
flagAustria
0%
5%
26%
68%
19
flagIndia
15%
20%
10%
55%
40
flagUkraine
14%
21%
14%
50%
14
flagRussia
35%
19%
7%
26%
42
flagItaly
31%
28%
17%
17%
85