Full sun
/fʊl sʌn/
Definition
Full sun describes a light condition in gardening and plant labeling where a site receives at least 6 hours of direct sunlight on most days, often including strong midday sun. It distinguishes plants that tolerate or prefer direct, unobstructed light from those suited to part sun, part shade, or full shade. The term refers to the growing location’s exposure, not to a plant structure or growth stage.
Practical Relevance
- Flowering and fruit set: Many vegetables, herbs, and flowering annuals need full sun to produce enough energy for buds, blooms, and ripening fruit. In lower light, plants often grow leaves but flower less heavily.
- Growth habit in strong light: Plants adapted to full sun usually stay more compact and sturdy because bright light reduces stretching. Shade-loving plants placed there may show scorched leaves, faded color, or midday wilting.
- Heat and moisture effects: Sites with full sun dry out faster and heat up more during the day, especially in containers and raised beds. That changes watering needs and can raise the risk of heat stress in sensitive species.
- Placement depends on local conditions: The impact of full sun varies with climate, season, and exposure. Morning sun is often gentler, while intense afternoon sun is more likely to stress plants in hot regions.
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