Here is an increased length version of my last answer, without repeating myself:
Here are some vegetables with 4 letters in Dutch:
- Biet
- Boon
- Kool
- Mais
- Moes
- Okra
- Peen
- Prei
- Raap
- Uien
Additional vegetables with 4 letters in Dutch:
- Bimi
- Erwt
- Knol
- Peul
- Spruit
I hope this is helpful!