Sunflower care guide
Helianthus annuus
Also known as: Common sunflower, Helianthus
Pets and children
We haven't been able to confirm how this plant affects pets or small children. If any is eaten, consult a veterinarian or a doctor.
How often to water Sunflower
- Spring–Summer (Mar–Sep)
- Every 2 days
- The big leaves lose a lot of water, so water thoroughly once the topsoil dries, as a guide, morning and evening for pots in midsummer.
- Autumn (Oct–Nov)
- Every 3 days
- For late-sown plants blooming in fall, drying slows as it cools, so about every two or three days once the surface dries is the guide.
- Winter (Dec–Feb)
- Every 7 days
- An annual that dies in fall: no watering is needed in winter, and as a guide just store the dried seed for next year.
Light and placement for Sunflower
Full sun outdoors all day is the guide; in low light the stem grows thin and floppy and the flower stays small, and a windy spot needs a stake.
Overwintering Sunflower
Overwintering guide: 5°C (41°F) or above
An annual that is not overwintered: generally collect seed after flowering and sow again from late April once the weather warms, keeping the seed cool and dry.
Fertilizing and repotting Sunflower
Fertilizer
Slow-release fertilizer at sowing and liquid feed about every two weeks until the bud shows; too much makes it tall and top-heavy.
When to repot
Spring–Summer (Mar–Sep)
Common problems with Sunflower
- Transplanting a large seedling damages the roots and growth stalls.
- A small pot dries out repeatedly and the flower comes small.
- Typhoons or strong wind snap the stem.
Tips for growing Sunflower
- It dislikes transplanting, so sow two or three seeds in the final pot or bed and thin to one.
- On a balcony, dwarf varieties 30 to 50 cm tall are easier to manage.
- Sowing in batches from May to July gives flowers in sequence until fall.
These are AI-generated general guidelines. They vary with the variety, the placement and the pot size. For effects on pets or children, consult a veterinarian or a doctor.
Keep your plant log going
Greenery is a free app that keeps your plant care going, with watering reminders and photo records. Available on iOS and Android.
