Using any “adamah” is ok from a purely halachic bracha standpoint. A strawberry also works.
A normal way of thinking would suggest some sort of green vegetable akin to real “karpas” which is a type of celery.
In Europe these types were scarce , and some, like parsley, were unknown, resulting in odd vegetables being used, such as the potato . Sometimes the narrow halachah or minhag isn’t enough, and using common sense is beneficial.
