As I understand it, beans were included as kitniyot because they grew in the ground next to wheat.
However, if you grew the beans hydroponically, would they still be classified as kitniyot?
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Yes. The real question is do you say "ha'adamah or "she'hakol" on them.
The issue is that it is still by definition a bean. Per the OU: The Mishnah Berurah (453:6 & 464:5) cites three reasons for the minhag (a) kitnios is harvested and processed in the same manner as chametz, (b) it is ground into flour and baked just like chametz [so people may mistakenly believe that if they can eat kitnios, they can also eat chametz], (c) it may have chametz grains mixed into it [so people who eat kitnios may inadvertently be eating chametz]. The fact that it is grown hydroponically changes nothing about the potential processing of the beans.