Tradescantia.

in one garden.. a nice clumping plant.

in another garden.. a highly invasive seeder.. killed it 10 years ago.. and i still have seed sprouting...

it is what it is.. as to its flowering pattern... you seem inclined to think its doing it wrong....

if its already moving around that bed.. be forewarned.. so you can be four armed...

near impossible to pull out....

ken

The rest of the buds have already bloomed and are done. This time of year my spiderwort dies slows down and dies back. I hear that if you dead head spent blooms it will prolong blooming, but we never bother.

I don't have Ken's problems with it spreading. In fact, we've killed several plants over the years. They like moist soil, though the ones I added by my bog looked rather unhappy. That might be because I managed to trample them tending to the waterfall a few times though.

This tradescantia is different and better behaved than the weedy one that Ken is referring to.

Furthermore it's growing in the UK since the member page of the OP states that. One cannot judge how a plant will behave in other areas .

Perhaps ken is thinking of Dayflower, Commelina.

Thanks for all the feedback folks. The only reason I said the UK was just because its where I am and I assumed that plant species might act differently in the different climates. I appreciate the time you've all taken! After reading through I decided to look closer and the poster above was certainly right, the heads are all spent. I'm going to cut back and hopefully next year will be a full plant of blue flowers.