Troubleshooting
Scarlet Sage problems — and how to fix them
Scarlet Sage (Salvia splendens) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Botrytis (grey mould) on flower spikes
The dense flower spikes trap humidity and are prone to grey botrytis mould, especially in cool, wet weather or when watered overhead. Improve air circulation, remove affected spikes promptly, and water only at soil level.
Aphid infestations on new growth
Soft shoot tips and flower buds are frequently colonised by aphids, which stunt growth and cause distorted flowers. Check plants regularly from spring and treat early infestations with a strong water spray or insecticidal soap; avoid high-nitrogen fertilisers, which encourage the lush growth aphids prefer.
Prevent scarlet sage problems before they start
Most scarlet sage issues are care-mismatch, not bad luck. Dial in the basics:
Scarlet Sage problems — FAQ
Why is my scarlet sage botrytis (grey mould) on flower spikes?
The dense flower spikes trap humidity and are prone to grey botrytis mould, especially in cool, wet weather or when watered overhead. Improve air circulation, remove affected spikes promptly, and water only at soil level.
Why is my scarlet sage aphid infestations on new growth?
Soft shoot tips and flower buds are frequently colonised by aphids, which stunt growth and cause distorted flowers. Check plants regularly from spring and treat early infestations with a strong water spray or insecticidal soap; avoid high-nitrogen fertilisers, which encourage the lush growth aphids prefer.