Troubleshooting
Dianthus 'Mrs Sinkins' problems — and how to fix them
Dianthus 'Mrs Sinkins' (Dianthus 'Mrs Sinkins') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Flopping and calyx splitting
The large double blooms are top-heavy and the calyces often split, causing flowers to fall sideways; discreet support and avoiding rich feeding help.
Crown rot from wet soil
Poor drainage or winter wet rots the crown — the main cause of loss. Use gritty, free-draining soil and avoid mulch over the crown.
Woody, sparse base with age
Old plants open out and flower less after a few years; take cuttings regularly to renew this heritage cultivar.
Fungal leaf spot and rust
Damp, crowded, overhead-watered plants develop spotting or rust; water at the base and improve ventilation.
Prevent dianthus 'mrs sinkins' problems before they start
Most dianthus 'mrs sinkins' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for dianthus 'mrs sinkins' in general rather than its problems? Read the full dianthus 'mrs sinkins' care guide — light, water, soil and feeding.
Dianthus 'Mrs Sinkins' problems — FAQ
Why is my dianthus 'mrs sinkins' flopping and calyx splitting?
The large double blooms are top-heavy and the calyces often split, causing flowers to fall sideways; discreet support and avoiding rich feeding help.
Why is my dianthus 'mrs sinkins' crown rot from wet soil?
Poor drainage or winter wet rots the crown — the main cause of loss. Use gritty, free-draining soil and avoid mulch over the crown.
Why is my dianthus 'mrs sinkins' woody, sparse base with age?
Old plants open out and flower less after a few years; take cuttings regularly to renew this heritage cultivar.
Why is my dianthus 'mrs sinkins' fungal leaf spot and rust?
Damp, crowded, overhead-watered plants develop spotting or rust; water at the base and improve ventilation.