Heat, They need an English type climate, which you may not find in Texas.

Yep. Blossom Drop. There is a FAQ here about it. Other possible causes like excess nitrogen fertilizers but heat is by far the most common cause.

Dave

Here is a link that might be useful: Blossom Drop FAQ

Thanks. It is only going to get hotter. Based on you guy's experience, So, should I pull them?

I grew a runner type last year. It was too hot in Chicago summers and I got very few beans. The were pretty though. Debated planting them as an ornamental somewhere, since I have lots of seeds left.

I wouldn't unless you need the room for something else. They are attractive, draw pollinators, and if you keep them well watered until the weather breaks you'll get beans then. You are bound to get a few days now and then where pollination is possible or you can always try the early AM hand pollination tricks that work on other veges.

But its your choice.

Dave

I was frustrated with scarlet runners in Z 7, they didn't like the muggy summer weather at all, but in the mountains with cool nights (6b) they are very happy indeed. Mine bloom all summer and set a few pods, from which I harvest the dry beans in late summer. With light trimming and deep watering, the plants make a strong comeback in the fall and the immature beans that set in cool fall weather are extraordinarily sweet and tender, great to eat raw.

If you don't think your plants will make it through summer, you might start some new seedlings in late summer for a fall crop.