Growing Carrots With Grow Lights

Nothing beats a fresh carrot for crunch and flavour. You won’t find that freshness in your supermarket — most grocery store carrots spend months in cold storage.
Carrots don’t seem like the kind of crop that would do well indoors. In fact you can grow really well with the right conditions. They don’t need loads of space but they are quite light-hungry.

Carrots Light Requirements

Keep daylight periods under 12 hours to avoid bolting and flowering.

Carrot plants will thrive under lights that provide:




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 Carrots

Keep daylight periods under 12 hours to avoid bolting and flowering.

Carrot plants do best with a lights on for:




Best Grow Lights for Carrots

It takes a pretty powerful light to provide 20-30 DLI in a 12 hour period. That’s what’s needed though. The Bright Grow recommendation is the GE PAR38 balanced grow bulb. Hang the bulb 12-13 inches above the plant’s leaves. This will give you a circle of light 8 inches across that’s just the right amount of bright.

Carrots, 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 Carrots.

Temperature for Carrots

Carrots prefer cool nighttime temperatures — around 45 to 50°F






Size of Carrot Plants

Carrots don’t need much space for their leaves. They do need need at least 12″ of soil depth to develop properly though. Grow multiple plants with 3-4″ separation in a deep container.
Typically grows 8


” tall

Does well in 10


” diameter containers

Carrot Varieties

Select a more compact carrot for indoor growing. Many varieties are suitable for containers. Try:
  • Scarlet Nantes
  • Danvers Half Long
  • Little Finger

Carrot Tips

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