Do microgreens need direct sunlight to grow?
Written by
Benjamin Miller
Reviewed by
Prof. Samuel Fitzgerald, Ph.D.To effectively grow microgreens indoors, it's vital to understand their light without sun requirements. Those tender greens are not well-suited for intense sun. Sunburned or scorched leaves, as well as poor growth, can often be attributed to incorrect lighting. I usually counsel beginners on milder lighting options.
Natural Light Setup
- Position trays within 6 inches of south-facing windows
- Use sheer curtains to diffuse harsh afternoon sunlight
- Rotate trays 180 degrees every morning for even exposure
Artificial Light Systems
- Install full-spectrum LED panels 2-4 inches above seedlings
- Set automatic timers for 12-16 hours daily illumination
- Adjust brightness using dimmer switches for different growth stages
Avoid light damage by being vigilant about intensity. Direct sunlight can scorch leaves in the summer in a matter of hours. Low light will leave seedlings pale and leggy. I use low-cost smartphone apps to measure light levels. Consistently hit 15,000 - 20,000 lux for best growth.
Achieve optimal growth by following a daily checking regimen. Check seedlings for color changes indicating light stress every morning. Measure stem length once every three days. If seedlings begin to elongate, adjust light heights immediately. Maintaining constant vigilance can help prevent irreversible tissue damage.
During the dark winter months, you will need to supplement natural light in indoor conditions. Connecting window light and low-watt LEDs will provide consistent light year-round. This combination allows my apartment garden to stay productive, and I have leafy greens in my kitchen garden, even when it's stormy outside in December.
The investment in lighting will pay off quickly during the harvest cycles. Take note of how much money you've saved compared to the cost of store-bought greens. Report your experience to other indoor gardeners. The healthy microgreens you are nurturing will offer optimal light from your controlled environment.
Read the full article: How to Grow Microgreens Indoors at Home
