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Helianthus annuus
Growing calendar
Typical timing for central Japan (Kanto region). Shift it for your own climate, and record your actual dates.
Guides
- Types of Sunflower: Single-Stem Giants and Branching Multi-Headed Kinds
- How to Sow Sunflower Seed: Depth, Spacing and Soil Temperature
- Sunflower Care: Staking Tall Stems Before They Lean
- What to Watch on a Sunflower: Reading Leaves, Stem and Head
- Harvesting Sunflower Seeds: When to Cut the Head and How to Dry It
- Sunflower Growing Calendar: Sowing, Staking, Flowering and Seed
Common problems
Start from what you can see on the plant.
Pests and diseases (25)
Problems recorded for this plant, most serious first.
Aphids
MajorPest
Small green or black insects cluster on shoot tips and leaf undersides, crinkling the leaves and stopping growth. The honeydew they excrete supports sooty mold that blackens the foliage.
Powdery Mildew
MajorDisease
White patches appear scattered on the upper leaf surface at first, then the whole leaf is coated in a white powder. Leaves later yellow, brown and die back, and reduced photosynthesis cuts growth and yield.
Sclerotinia Rot
MajorDisease
The crown, stem or head rots in a water-soaked way and is covered in white cottony mycelium. Black sclerotia later form inside and on the surface, and the plant wilts and dies.
Damping-off
CommonDisease
The stem pinches in at soil level, turning water-soaked to brown and thin, and the seedling topples over. Infection before emergence makes the stand uneven with missing plants.
Downy Mildew
CommonDisease
Pale yellow to yellow-brown angular lesions form on the upper leaf surface with a gray-purple mold in the matching spot underneath. Lesions merge, the leaves die back and the plant declines early.
Cabbage Armyworm
CommonPest
Young larvae feed in groups on the leaf underside, eating only the tissue so the leaf turns translucent white. Larger larvae chew big holes and can strip a plant bare in a single night.
