Grow Light for Nemesia: Cool Bright Rooms plus Blooms
A grow light for nemesia helps this cool weather flower bloom indoors when window light runs short. NC State Extension notes nemesia prefers cool to moderate temperatures plus full sun, while University of Missouri Extension explains how electric light fills the gap indoors.
The short answer
A grow light for nemesia works well as a full spectrum LED hung 6 to 12 inches above the tips. NC State notes nemesia prefers cool to moderate temperatures. Missouri notes plants with no window light need 16 to 18 hours a day, while Maryland advises no more than 16 hours in total.
How much light does nemesia need indoors?
NC State notes nemesia thrives in full sun but appreciates afternoon shade in hot weather. It favors cool to moderate temperatures plus can produce many flowers in mild conditions.
| Factor | Target | Why |
|---|---|---|
| Lamp height | 6 to 12 inches above tips | Flowering plants, per Missouri |
| Hours with no window light | 16 to 18 | Missouri |
| Hours with some window light | 12 to 14 | Missouri |
| Upper limit | 16 hours | Maryland |
| Outdoor light | Full sun | NC State |
Source: Missouri, Maryland plus University of Minnesota Extension.
Where should a grow light sit for nemesia?
Missouri plus Minnesota advise placing flowering plants 6 to 12 inches from the light. Hang the fixture on a chain or stand so it rises as nemesia grows.
How many hours should the light run?
Missouri notes plants with no outdoor light need 16 to 18 hours a day, while 12 to 14 hours may do if some window light reaches them. Maryland advises no more than 16 hours in total.
How to: step by step
- Set nemesia in a cool, bright room.
- Choose your sunniest window if you can.
- Mount a full spectrum LED above the plant.
- Hang the light 6 to 12 inches above the tips.
- Run the light on a timer for up to 16 hours.
- Shift it somewhere cooler if flowering slows.
Troubleshooting
Long, weak stems: low light. Lower the lamp or add hours.
Pale or scorched leaves: Maryland notes excess light can turn leaves pale plus brown. Raise the lamp.
Plants stop blooming: room too warm. NC State notes summer heat causes die back. Move to a cooler spot.
For lamp setup see grow lights for cannabis, led light distance cannabis plus grow light timers. Browse cannabis seeds. Kind Seed Co also stocks cannabis seeds.
Sources
- Nemesia strumosa (nemesia), NC State Extension Gardener Plant Toolbox
- Lighting for indoor plants, University of Maryland Extension
- Lighting indoor houseplants (G6515), University of Missouri Extension
- Lighting for indoor plants and starting seeds, University of Minnesota Extension
FAQ
Can nemesia grow under a regular LED bulb?
A household LED gives some light, but a full spectrum grow light is brighter plus easier to aim. Missouri notes plants with no window light need 16 to 18 hours of light a day. Hang the lamp 6 to 12 inches above the tips of nemesia for the most useful light.
Should the light run all night?
No. Maryland advises no more than 16 hours of light in total each day plus notes too much light can turn leaves pale plus brown. Missouri notes 16 to 18 hours suits plants with no window light. A plug in timer gives nemesia the same day length every day without any effort.
Does nemesia need cool temperatures?
Yes. NC State Extension notes nemesia prefers cool to moderate temperatures plus is often grown as a cool weather annual. In mild temperatures it can produce many flowers. Indoors, a cool bright room under a grow light suits it better than a warm spot near a heater or a sunny, hot window.
Do plants need a dark period?
Yes. University of Maryland Extension notes most plants require a period of darkness to develop properly. It advises lighting them for no more than 16 hours each day in total, especially when artificial light adds to window light. Set a timer so the lamp switches off at the same time each night.
Why does nemesia die back in summer?
NC State Extension notes summer heat results in die back. Nemesia blooms from late spring to the first frost in mild climates but slows when it gets hot. Indoors, set the pot away from heat sources plus give it a grow light rather than a hot south window.
