Do you plant them in the shade? They are one of the few flowering annuals that prefers shade. They also don't like chilly temperatures so does it get cold at night where you are?

They definitely hate cold wet soil!Try using a well drained but rich soil mix next time you plant them,and bring the pots indoors at night.From what I can tell from the zone you're in they might do a little better with more sun as well.I'll recommend spraying your new plants lightly with a nice fungicide (spray towards the evening)
and it might make a big difference.

Thanks for your ideas. Our weather had been quite warm until recently and it was during that time it seemed to start failing. It's growing in part shade and the soil is generally well drained. It's in a large container up against a white wall.

Maybe it just needs more sun and more heat?

What diseases are they prone to? What is the name?

Thanks again

Perhaps your problem is with the type of browallia you are growing. My first experience with it was browallia americanus, which I grew from seed. Three years later, I am still growing it as it volunteers. I have it in pots, and believe it or not it is doing well and blooming in full, horrendous sun. We've had temps near 100 for three weeks running now. I'm amazed. It is also happy in almost complete shade.

Last year, I found a hybrid type in a nursery and tried it. It was hohum at best and, of course, did not return.

The browallia that I grow every year is purchased from garden centers. I have no idea what type it would be. It
Looks fantastic in the greenhouses then within about a month the leaves start looking unhealthy and it slowly begins to die. Even pruning the ugly bits doesn't help to save it. What types do the garden centers generally sell?

Thanks

I don't remember the hybrid name I tried last year. It was quite different from my seed grown ones, though. The leaves were thicker, the plant was shorter and the blooms were a bit larger. It was great, except that it wouldn't thrive. My seed grown ones have a central stem about 12 inches tall with lots of horizontal branching. The leaves are neat and kind of tear drop shaped with prominent veins. The blooms are about 1/2 to 3/4 inch in diameter. They are a darker, truer blue than the hybrid plant was.