Countertop Harvest
By the Countertop Harvest team · Last updated
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Can herbs grow with no sunlight at all?
Yes, if artificial light replaces the sun. Iowa State Extension says that when light levels are not adequate, herbs grow well under supplemental light, and recommends full-spectrum grow lights in high-output fixtures. Without enough light, herbs get thin and spindly with smaller leaves and weaker aroma (Penn State Extension). Penn State lists chives, cilantro and lemon balm as tolerating only 2–6 hours of direct sun, but even those need real light, not just a dim room.
How much grow light do herbs need?
| Question | Extension guidance |
|---|---|
| Hours per day | 12–16 hours on a timer (Iowa State); 14–16 hours under fluorescent tubes (Penn State). Leave a dark period. |
| Distance | Within 6–12 inches of the leaves for higher intensity (Iowa State). LEDs can often sit 12–24 inches away depending on strength. Follow the maker's instructions. |
| Light type | Full-spectrum grow light in a high-output fixture (Iowa State). |
| Too much light? | Bleached or scorched leaves mean move the light further away (Iowa State). |
Setups for a kitchen with no sun
Smart garden with built-in light
e.g. LetPot LPH-Air
- 10 pods, 24W full-spectrum light up to 14"
- App light schedule and water alerts
- Has a pump; add plant food
Soil-pod smart garden
e.g. Click & Grow Smart Garden 3
- 3 pods, 8W light, passive watering, no pump
- Click & Grow estimates about 3.8 kWh a month
- Uses proprietary pre-seeded pods
Under-cabinet LED bar
e.g. Modern Sprout Smart Growbar
- Flush-mount full-spectrum bar for a shelf or cabinet
- App schedules, timers and brightness
- Stick-on mounting, no drilling (per Modern Sprout)
Step by step: herbs in a room with no sun
- Pick easy herbs: mint, chives, parsley or basil (see best herbs to grow indoors).
- Use pots with drainage holes, or a smart garden.
- Hang a full-spectrum light close above the leaves and raise it as plants grow.
- Plug it into a timer for 12–16 hours a day.
- Keep basil above 50°F; Penn State notes it cannot survive colder temperatures.
- Water by touch, when the top of the soil is dry.
- Watch the leaves: stretching means more light, bleaching means less.
Want the full light explainer? Read how much light indoor herbs need. Shopping on a budget? Compare grow lights under $50 or smart gardens under $100.
Sources
- Iowa State Extension: providing more light for herbs indoors
- Iowa State Extension: setting up supplemental lights
- Penn State Extension: growing herbs indoors
- LetPot LPH-Air
- Click & Grow Smart Garden 3
- Modern Sprout Smart Growbar
Frequently asked questions
Can you grow herbs indoors without sunlight?
Yes, with a full-spectrum grow light. Iowa State Extension says herbs grow well under supplemental light when natural light is not adequate.
How many hours of grow light do herbs need?
12 to 16 hours a day on a timer, per Iowa State Extension. Leave a dark period.
How close should a grow light be to herbs?
Iowa State recommends within 6 to 12 inches of the leaves for higher intensity; LEDs can often sit 12 to 24 inches away. Follow the maker's instructions.
Which herbs tolerate the least light?
Penn State Extension lists chives, cilantro and lemon balm as tolerating 2 to 6 hours of direct sun.
What is the easiest way to grow herbs in a dark kitchen?
A smart garden with a built-in light and timer, which handles light and watering together.