Growing Beans With Grow Lights

Fresh beans have flavor you won’t find in store-bought beans. A great addition to your indoor garden once you have some experience growing smaller plants.
Beans can do well under grow lights. Even the relatively compact varieties stretch fairly tall though. So you need to make sure you’re giving them plenty of light to keep the whole plant happy.

Beans Light Requirements

Some varieties are “day-neutral” and do well with a 14-16 hour daylight period. Other varieties are “short day” and should have 12 hours of lighting.

Bean plants will thrive under lights that provide:

20

30

 DLI 

DLI (Daily Light Integral) is how we measure amounts of “plant-useful” light. Once we know a plant’s DLI needs we can match it to the ideal grow light setup.

Day Length for Beans

Some varieties are “day-neutral” and do well with a 14-16 hour daylight period. Other varieties are “short day” and should have 12 hours of lighting.

Bean plants do best with a lights on for:

12

16

 hours 

Best Grow Lights for Beans

16 hours of light is a pretty good target for day-neutral varieties of beans — particularly if they’re in your living space and you like to sleep.

You’ll need a fairly powerful light to provide 20-30 DLI in a 16 hour period. The Bright Grow recommendation is the GE 24″ LED Fruit & Flower Fixture. Hang the light just three or four inches above your leaves — raising it to stay just at that distance as the plant grows. This will give an optimal amount of light directly under the footprint of the lamp.
Beans, like all fruiting plants, will grow best under a light that's heavy on the red parts of the spectrum. A "fruit and flower" LED grow light is a good choice for growing Beans. High output fluorescent bulbs can work too but they generally provide less of the important red wavelengths.

Temperature for Beans

Warmer temperatures are ok as long as nightimes are cooler.

Germination: 

70

 – 

80

°F 

Growth: 

70

 – 

85

°F 

Many plants germinate at lower temperatures and prefer more warmth for their growth. This is how plants have evolved — sprouting early in the spring when the days are cool and growing and producing as the days get longer and warmer.

Size of Bean Plants

Typically grows 36

” tall

Does well in 6

” diameter containers

Bean Varieties

Stick to the bush varieties which grow to around 3ft tall.
  • Bush Green
  • Bush Yellow
  • Bush Kentucky Wonder

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