Sunflower
Helianthus annuus
flowerSunflowers are cheerful annual flowers that grow rapidly to impressive heights, producing large yellow flower heads that track the sun. They're easy to grow and a favourite with children.
Full care guide →
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.
Full care guide →Care aspect
Sunflower
Dahlia
light_modeLight
Full sun — absolutely essential.
Full sun.
water_dropWater
Moderately. Deep but infrequent once established.
Regularly and deeply — keep evenly moist.
compostSoil
Well-draining soil. Tolerant of poor soil.
Rich, well-draining soil.
scienceFertiliser
Avoid excess nitrogen (promotes leaves over flowers). Low-nitrogen feed.
High-potash feed every 2 weeks from July.
thermometerTemperature
18–35°C. Frost-sensitive.
Not frost hardy. Plant tubers after last frost.
humidity_percentageHumidity
Tolerates low humidity.
Moderate.
Toxicity
Audience
Sunflower
Dahlia
cats
check_circleSafe
warningToxic
dogs
check_circleSafe
warningToxic
children
check_circleSafe
check_circleSafe
Sunflower — USDA Zones
3a3b4a4b5a5b6a6b7a7b8a8b9a9b10a10b
Dahlia — USDA Zones
8a8b9a9b10a10b11a