Posted: 19/06/2016 at 15:24
I have the same issue with three pot plants on my balcony: some pinks, an Arabis arendsii and a couple of Aubrietia. They've all put on a good show, but the Arabis and the Aubrietia are long over (I cut them back after flowering), while the pinks in question have about finished their first flush.
My problem is that they've died off quite a bit in the centre. The peripheral growth looks healthy, but the middle is brown and empty looking. They're not rotten, and if you cut the stems, they're healthy-looking inside.
Is there any trick to fix this problem? Should I simply have cut them back much harder? Can I do so now without risk of killing them?