Dahlia
Dahlia spp.
flowerDahlias produce some of the most spectacular flowers in the garden from mid-summer until first frost. Lift tubers in autumn in cold climates and store frost-free.
Common Problems
Select the problem your Dahlia is experiencing to get a treatment guide.
Care Guide
Toxicity
Mildly toxic if large amounts ingested.
Common Diseases
Common Pests
Seasonal Care
Resume regular watering and feeding as growth picks up.
Peak growing season. Water and feed regularly.
Reduce watering as growth slows. Stop heavy feeding.
Minimal watering and feeding. Protect from frost if needed.
Similar Plants
Frequently Asked Questions
Do I need to dig up my Dahlia tubers every year?
In cold climates, yes — lift tubers in autumn and store them frost-free over winter, since Dahlias are not frost hardy and won't survive freezing temperatures in the ground.
Why does my Dahlia need so much potassium fertilizer?
A high-potash feed every 2 weeks from July supports the spectacular blooms Dahlias are known for, since potassium specifically boosts flowering rather than leafy growth.