How much sun does rosemary need daily?
Written by
Michael Sullivan
Reviewed by
Prof. Charles Hartman, Ph.D.Rosemary requires six to eight hours or more of direct sunlight each day for maximum growth and oil production. This native of the Mediterranean region evolved with high sun intensity in mind, leading to its unique aroma and taste. When it does not receive enough light, rosemary will become leggy, have bare spots or little foliage, and yield less essential oil.
Outdoor Garden
- Plant in south-facing locations with uninterrupted exposure
- Morning sun reduces moisture stress compared to afternoon
- Trim nearby foliage blocking light penetration
Container Plants
- Rotate pots weekly for even light distribution
- Elevate containers to avoid shade from railings
- Move seasonally to track sun angles
Indoor Growing
- Place within 12 inches of south-facing windows
- Supplement with full-spectrum LED grow lights
- Provide 12-14 hours of artificial light daily
I discovered that shaded plants often develop yellow leaves and exhibit poor growth. My first rosemary plant seemed almost dead under tree cover, so I moved it to full sun. In a few weeks, new growth was darker green and more aromatic. That experience cemented the idea that sunlight is a firm requirement.
Supplemental lighting is a necessity during limited daylight in winter. Use LED grow lights suspended 6-12 inches above your plants. Provide 12-14 hours of daylight to simulate the Mediterranean summer environment. This will keep plants awake, growing, and producing oils all year long!
Watch for signs of light yawning, which usually includes leaning stems. Rotate your containers regularly to make certain all sides receive equal light exposure. In the garden, prune any nearby plants/shrubs that shade the plant. These minor adjustments will guarantee your rosemary is receiving its essential sun check off of its daily sun calendar.
Read the full article: 7 Essential Steps: How to Grow Rosemary Perfectly
