Thinking about getting in on the microgreens trend? You are not alone. Many growers are attracted to the fast-growing, high-value crop. Chefs are drawn to microgreens for the bold flavors, colors and textures they bring to the table. Retail consumers seek them out for their high nutritional content.

What are microgreens?

Microgreens are made up of plants in their early growth stages. Microgreens are harvested after the first set of true leaves emerge. Popular species include brassicas, herbs, legumes and seed crops. Microgreens are sold as both mixes or individually.

What’s the best way to grow this popular crop?

LED grow lights are a natural fit for these production environments and crops due to their dimmability, and spectral range. The fixtures’ low heat emissions also allow them to be placed close to the crops below without causing damage. This allows growers to maximize their vertical growing space. Adjustable spectrum LEDs also allow microgreen growers to customize each crop.

Research has shown that nutrient density and flavor profiles of microgreens can be influenced by light spectrum. Adjustable spectrum LEDs allow microgreen growers to take advantage of these effects without having to purchase additional fixed-spectrum lights or expend the labor to move the crops during their short life cycle.

Stretched plant under red light v compact plant under blue light
Generally speaking, increased ratios of red light promote microgreen growth. Increased ratios of blue light promote higher nutrient levels.

Which light spectrums do what for microgreens?

Generally speaking, increased ratios of red light promote microgreen growth. Increasing the ratio of blue light can promote higher nutrient levels.

For example, blue light increases anthocyanin production, an antioxidant that gives the microgreens a beautiful reddish-purple hue. Some growers apply light treatments throughout the crop cycle, while others use light treatments as an end-of-cycle application. While responses to light spectrum vary by species, studies have identified light treatments for some popular microgreen crops.

We’ve shared three light treatments below to provide guidance for customizing light treatments in your production.

You can trial these concepts and the following treatments to determine the effects of light spectrum on the microgreens in your growing environment. Luckily, microgreens’ short cycle time and high retail value make it worth the effort to find the optimal treatment to achieve the desired effects.

Light Treatments for Microgreens

Pie charts showing suggested ratios of red:blue:green light for microgreens