# Sun Seekers (DD-172)

> Young sunflower plants (Helianthus annuus) show heliotropism: before the flower heads open, the buds turn to follow the Sun from east to west during the day and swing back to face east overnight. The motion is driven by an internal clock and uneven stem growth. Once the heads mature and bloom, they stop tracking and mostly stay facing east, which warms them in the morning and draws more pollinators. A uniform field of east-facing heads can give the false impression that open flowers track the Sun. The footage shows sunflower fields, with the presenter.

- Department: Nature (also Science)
- First published: 2024-01-10
- Last updated: 2024-01-10
- Permalink: https://detailenjoyer.com/case/sun-seekers/
- Original Reel title: Sun Seekers 🌻
- Author: Marcus Easterling (DetailEnjoyer), The Detail Department

## Quick facts

- **DD-172-F01**: Young sunflowers follow the Sun. _(Write-up · Exhibit A (Heliotropism))_
- **DD-172-F02**: They swing back east overnight. _(Write-up · Exhibit B (Reset overnight))_

## Write-up

Young sunflowers follow the sun, then stop. Mature heads face east for good.

1. **Heliotropism**: Young sunflowers follow the Sun.
2. **Reset overnight**: They swing back east overnight.
3. **Before blooming**: Tracking happens before the heads mature.
4. **Face east**: Mature heads mostly face east.
5. **A false impression**: East-facing fields can look like tracking.

## Related case files

- [Nectar Collectors (DD-175)](https://detailenjoyer.com/case/nectar-collectors/): I linked the insects that visit flowers
- [Busy Busy Bees (DD-174)](https://detailenjoyer.com/case/busy-busy-bees/): I linked the pollinators that sunflowers draw in
- [Sakura (DD-173)](https://detailenjoyer.com/case/sakura/): I linked another plant that times itself to the Sun and seasons

## Reel vs. record

- **Note**: 'Young sunflower blooms exhibit heliotropism': it's the young buds that track; once flowers open they mostly stop and face east.

## Video: Sun Seekers: Young Sunflowers Follow the Sun, Then Stop

- Duration: 25.6 s · Published: 2024-01-10
- File: https://detailenjoyer.com/assets/videos/C166pE1ujSy.mp4

### Transcript

Sunflowers are not only known for their vibrant appearance but also for their unique behavior known as heliotropism. DID YOU KNOW? Young sunflower blooms exhibit heliotropism by following the movement of the sun across the sky. This means that during the day the face of the sunflower tracks the sun from east to west maximizing its exposure to sunlight. As the sun sets the sunflower resets and prepares to face east again in the morning. This behavior is more noticeable in younger sunflowers and tends to decrease as they mature. NOW YOU KNOW!

## Questions & answers

**Q: What is heliotropism?**  
A: Young sunflowers do it. _(Source: Write-up · Exhibit A (Heliotropism) · Wikipedia: Helianthus annuus)_

**Q: Where do they face at dawn?**  
A: They reset overnight. _(Source: Write-up · Exhibit B (Reset overnight) · Wikipedia: Helianthus annuus)_

**Q: When does tracking happen?**  
A: In young plants. _(Source: Write-up · Exhibit C (Before blooming) · Wikipedia: Helianthus annuus)_

**Q: Which way do mature heads face?**  
A: Warmer in the morning. _(Source: Write-up · Exhibit D (Face east) · Wikipedia: Helianthus annuus)_

**Q: Why might fields look like they track?**  
A: A uniform alignment. _(Source: Write-up · Exhibit E (A false impression) · Wikipedia: Helianthus annuus)_

## Sources

- [Wikipedia: Helianthus annuus](https://en.wikipedia.org/wiki/Helianthus_annuus)

## Cite this case file

Easterling, Marcus. "Sun Seekers." The Detail Department (DetailEnjoyer), case file DD-172, last updated Jan 10, 2024. https://detailenjoyer.com/case/sun-seekers/