Troubleshooting
Candle Larkspur 'Guardian Blue' problems — and how to fix them
Candle Larkspur 'Guardian Blue' (Delphinium elatum) 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.
Powdery mildew
Very common on delphiniums; ensure good air circulation, water at the base, and apply a suitable fungicide at the first sign of infection.
Slugs and snails
Emerging shoots in spring are especially vulnerable; protect with copper barriers, organic pellets, or nematodes.
Wind damage
Tall spikes are easily snapped; stake each stem individually using canes and garden twine before the spike reaches full height.
Black blotch (Pseudomonas)
Irregular black patches on leaves and stems; no cure — remove affected material and avoid overhead watering.
Short lifespan
Often short-lived (2-4 years); raise new plants from seed or basal cuttings in spring to maintain stock.
Prevent candle larkspur 'guardian blue' problems before they start
Most candle larkspur 'guardian blue' issues are care-mismatch, not bad luck. Dial in the basics:
Candle Larkspur 'Guardian Blue' problems — FAQ
Why is my candle larkspur 'guardian blue' powdery mildew?
Very common on delphiniums; ensure good air circulation, water at the base, and apply a suitable fungicide at the first sign of infection.
Why is my candle larkspur 'guardian blue' slugs and snails?
Emerging shoots in spring are especially vulnerable; protect with copper barriers, organic pellets, or nematodes.
Why is my candle larkspur 'guardian blue' wind damage?
Tall spikes are easily snapped; stake each stem individually using canes and garden twine before the spike reaches full height.
Why is my candle larkspur 'guardian blue' black blotch (pseudomonas)?
Irregular black patches on leaves and stems; no cure — remove affected material and avoid overhead watering.
Why is my candle larkspur 'guardian blue' short lifespan?
Often short-lived (2-4 years); raise new plants from seed or basal cuttings in spring to maintain stock.