Why do some Brussels Sprouts taste horse-radish like?

[Mark Headley]

First we noticed it at a Trader Joe's store where they are still on the stalk, then recently at another store- QFC. We wondered if they were grown near horse radish or related somehow?

 

[Mark Headley]

Cooking: Why do my brussels sprouts taste like horseradish/wasabi? - Quora

Some Googled info...