What is the largest cactus in the World?

Saguaro
Opuntia
Rebutia
Cardon
Cardon is the tallest cactus species in the world, with a maximum recorded height of 19.2 m (63 ft), with a stout trunk up to 1 m (3.3 ft) in diameter bearing several erect branches. In overall appearance, it resembles the related saguaro (Carnegiea gigantea), but differs in: fewer ribs on the stems.
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Answers by country

Saguaro
Opuntia
Rebutia
Cardon
answers
flagAustralia
22%
5%
11%
61%
18
flagPakistan
5%
50%
5%
38%
18
flagPoland
18%
31%
15%
34%
563
flagGermany
0%
58%
16%
25%
12
flagGreece
16%
25%
33%
25%
12
flagthe United Kingdom
29%
17%
29%
23%
17
flagIndia
20%
44%
22%
12%
58
flagthe United States
44%
11%
38%
5%
18