Growing Spinach With Grow Lights

Spinach Light Requirements

Giving spinach 12 hours of light will avoid bolting and keep the plants productive and tasty.

Spinach plants will thrive under lights that provide:

12

16

 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 Spinach

Giving spinach 12 hours of light will avoid bolting and keep the plants productive and tasty.

Spinach plants do best with a lights on for:

12

 hours 

Best Grow Lights for Spinach

It takes a moderately powerful light to provide 12-16 DLI in a 12 hour period. The Bright Grow recommendations are:
  1. GE PAR38 balanced grow bulb. Hang the bulb 18 inches above the plant’s leaves. This will give you a circle of light 10 inches across that’s just the right amount of bright.
  2. The GE 24″ LED Fixture is also a decent bet. Hang the fixture just 5 inches above the plant’s leaf canopy. This will give a strip of optimal light 5 inches wide the length of the fixture.

Spinach, like other leafy plants, will thrive under a balanced full-spectrum light.

Balanced full-spectrum lights provide roughly equal amount of red and blue wavelengths while still appearing white to our eyes.

High Output fluorescent or LED grow lights will both work well for growing Spinach.

Temperature for Spinach

Spinach prefers cool temperatures. If you’re grow space is on the warm side try keeping lighting hours down to avoid bolting.

Germination: 

50

 – 

60

°F 

Growth: 

40

 – 

75

°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 Spinach Plants

Typically grows 8

12

” tall

Does well in 6

8

” diameter containers

Spinach Varieties

  • Winter Bloomsdale
  • Catalina

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