If you wonder why your fennel isn’t producing bulbs, it could be because it is Foeniculum vulgare, a high growing herb like variety that’s stems, leaves, and seeds can be used. Florence fennel is the variety known for producing bulbs when conditions are right. This plant prefers cool days and regular moisture. You can plant seeds either inside or outside. There are sub-varieties that do best in early, mid, and late summer so learn about the specific type you will plant. Again, these plants need enough water to stay moist but not too much that the bulbs become flooded.
Key Takeaways:
- So, the most likely reason for no bulb on fennel is that you have planted the wrong type.
- Another reason for fennel with no bulb is planting too late.
- Getting Florence fennel to produce bulbs requires two things: cooler summer days and consistent moisture.
“So, the most likely reason for no bulb on fennel is that you have planted the wrong type”
http://www.gardeningknowhow.com/edible/vegetables/fennel-vegetables/no-bulbs-on-fennel.htm