A top tip when growing hardy geraniums, like other perennials such as delphiniums, is about pruning. When flowering has finished, pruning these back to ground level will encourage a late round of flowers in the latter part of summer and also fresh foliage too.
Throughout the season, it’s important to deadhead spent flowers to encourage new ones. Then, only when the last few flowers have faded should the stem be removed.
Likewise, if there is any leggy growth that’s looking a bit worse for wear, pruning back can help to encourage more shoots. This can lead to denser and bushier growth for more impact.
Pinching geraniums can be done when a stem on a geranium plant is around 10cm long. Use a pair of scissors or your forefinger and thumb to punch off the end 1m of the stem. Do this to all of the stems to help the plant along to create a fuller plant. This can be done throughout spring for healthier looking plants.