Q.We Grew Evening Primrose From Seed But The Plants Bolted Into Tall Rosettes Without Blooms. Why Did Hey Not Bloom?
We had a very hot summer – most days over 30 deg. C.
Certified GKH Gardening Expert
Unfortunately, it is hard to say without knowing exactly how they were cared for, and the environment that they grew in. Unfortunately, to flower at their best, they need a somewhat specific set of conditions, though they are hardy and will grow pretty well otherwise.
Likely conditions that would stop flowering would be too much sun, not enough moisture, too much nitrogen in the soil while not having enough phosphorus and potassium in the soil, among other things. Fortunately, these things can be tested.
Here are some articles that will help: