Growing Nasturtiums With Grow Lights

Nasturtium leaves and flowers are edible and have a peppery flavour. The bright red and yellow flowers make a spectacular garnish.

Nasturtiums Light Requirements

Nasturtiums can handle a wide range of light intensity. Generally they will flower more profusely in more intense light.

Nasturtium plants will thrive under lights that provide:

12

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 Nasturtiums

Nasturtiums can handle a wide range of light intensity. Generally they will flower more profusely in more intense light.

Nasturtium plants do best with a lights on for:

10

16

 hours 

Best Grow Lights for Nasturtiums

It takes a moderately powerful light to provide 15-20 DLI in a 12 hour period. The Bright Grow recommendation is the GE PAR38 red reproductive grow bulb. The “red reproductive” spectrum light is white to the human eye but contains more of the red wavelengths of light that flowering plants need. Hang the bulb 16 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.
Nasturtiums, 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 Nasturtiums. High output fluorescent bulbs can work too but they generally provide less of the important red wavelengths.

Temperature for Nasturtiums

Nasturtiums like it cool — particularly for germination.

Germination: 

55

 – 

65

°F 

Growth: 

55

 – 

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 Nasturtium Plants

You can plant 2-3 Nasturtiums in a 10″ pot. Trim the plants as they grow outwards to keep them bushy and compact.
Typically grows 10

16

” tall

Does well in 8

10

” diameter containers

Nasturtium Varieties

Select a dwarf variety — they’re more manageable for indoor growing.
  • Baby Rose
  • Dwarf ‘Jewel’

Nasturtium Tips

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