You may need to move it further back, but this is best done in late autumn or early spring. The only other thing you can do is to cut it back when it finishes its main flush of flowers, usually sometime in early/mid July - you can usually see the new growth starting in the centre of the plant, and when you do, remove all of the outer, straggly, flowered shoots.

It is Geranium phaeum, so when it has finished flowering you cut it down to near the ground and you will then get nice new growth and a few flowers later on. Its habit of growth is to be tall and rangy, so it would be difficult to persuade it to grow otherwise.

Snap

You can both tidy it and move it, probably best done when it has finished flowering which will be soon I expect. I would trim off the flower stalks before moving it and if it is big you could always split it and have more than one plant.

Lots of watering once moved to let it settle in but geraniums are pretty tough normally and there should be no problem but watch out if the weather gets hot and give it regular watering. Ideally autumn would be the time to do it.

Thank you. I shall cut back as suggested, probably split it and plant a bit further away from the grass. For anyone interested it seems to be a truly fantastic plant for bees. We have many more bees in our garden this year, possibly to do with the fact that we have concentrated a bit on flowers but this geranium certainly seems to be a favourite.

Thanks again.

SG

You can get it with white flowers too. Geranium Phaeum Alba
The one you have in deep purple is Geranium Phaeum and is sometimes called the Mourning Widow

I've just got one of these ( after coveting it in other gardens) and have planted it near a path. So thanks to your advice I will move it to a more suitable position. Thanks for the help ( and the name).

I've grown this a few times, but never managed to find one with such dramatic dark flowers. Mine have turned out rather wishy-washy. I like the dark markings on the leaves too. Great specimen! :-)