Here's why it's so adaptable:

* Climate: Fennel prefers warm, sunny conditions but can tolerate a wide range of temperatures. It can even survive mild frosts.

* Soil: It's not picky about soil type, preferring well-drained, fertile soil but adaptable to different conditions.

However, there are some factors to consider:

* Growing Season: Fennel needs a long growing season (around 100 days), so regions with shorter summers may have difficulty getting a full harvest.

* Specific Varieties: Some varieties, like Florence fennel, prefer warmer climates, while others are more cold-hardy.

Therefore, it's more accurate to say that fennel can be grown in most states, but the specific varieties and success rate may vary depending on the local climate.

For more specific information on growing fennel in your state, you can consult your local extension service or search online for resources specific to your region.