Troubleshooting
Summer Skies delphinium problems — and how to fix them
Summer Skies delphinium (Delphinium elatum 'Summer Skies') 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.
Wind and rain lodging
The very tall, hollow stems snap or lodge in wind and heavy rain without support. Insert sturdy canes or purpose-made peony hoops early in the season when stems reach 30 cm; tie loosely at intervals up the stem.
Powdery mildew
Dense flower spikes trap humid air and promote mildew after bloom. Space plants well, water at the base, remove spent spikes promptly, and spray with potassium bicarbonate at the first signs.
Slugs and snails
Emerging shoots in spring are prime targets. Apply iron phosphate pellets or surround crowns with sharp grit; inspect plants at dusk and remove pests by hand to protect new growth.
Prevent summer skies delphinium problems before they start
Most summer skies delphinium issues are care-mismatch, not bad luck. Dial in the basics:
- Common candle larkspur problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- Summer Skies delphinium watering schedule
- Summer Skies delphinium light requirements
- Best soil mix for summer skies delphinium
- Summer Skies delphinium temperature & humidity
- Full summer skies delphinium care guide
Looking for summer skies delphinium in general rather than its problems? Read the full summer skies delphinium care guide — light, water, soil and feeding.
Summer Skies delphinium problems — FAQ
Why is my summer skies delphinium wind and rain lodging?
The very tall, hollow stems snap or lodge in wind and heavy rain without support. Insert sturdy canes or purpose-made peony hoops early in the season when stems reach 30 cm; tie loosely at intervals up the stem.
Why is my summer skies delphinium powdery mildew?
Dense flower spikes trap humid air and promote mildew after bloom. Space plants well, water at the base, remove spent spikes promptly, and spray with potassium bicarbonate at the first signs.
Why is my summer skies delphinium slugs and snails?
Emerging shoots in spring are prime targets. Apply iron phosphate pellets or surround crowns with sharp grit; inspect plants at dusk and remove pests by hand to protect new growth.