How to Prune geranium 'Kettlebaston'?
Deadhead regularly

geranium 'Kettlebaston' · Pelargonium 'Kettlebaston'
Also known as: geranium 'Kettle Baston'
Grow in fertile well-drained soil in full sun. Remove spent flowers. To overwinter, grow small plants in late summer from cuttings. See Pelargonium cultivation for further advice.
Deadhead regularly