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
flagPoland
19%
31%
14%
34%
922
flagPakistan
4%
47%
17%
30%
23
flagNigeria
46%
15%
7%
30%
13
flagthe United Kingdom
26%
26%
19%
26%
26
flagGreece
16%
25%
33%
25%
12
flagthe United States
42%
7%
27%
22%
40
flagGermany
25%
44%
11%
18%
27
flagIndia
16%
45%
21%
15%
83