How much sun do herbs need? A by-herb sunlight chart

Most culinary herbs are sun-lovers. As a quick answer: the majority want full sun, meaning 6 or more hours of direct light a day, while a handful get by on 3 to 5 hours of partial sun. The chart above sorts the common herbs so you can match what you grow to the light your window or balcony actually gets, rather than fighting it.

Full-sun herbs

These want as much direct light as you can give them and grow weak, leggy, or flavourless without it:

• Basil, rosemary, thyme, oregano, sage, dill. All want 6 or more hours of direct sun.

If you have a bright south or west exposure, these are the herbs that will reward it. The best of them for an outdoor sunny spot are covered in best herbs for a sunny balcony.

Partial-sun and shade-tolerant herbs

A few herbs cope with less light and are the right pick for a dimmer spot:

• Chives, parsley, cilantro, mint. They do reasonably well with 3 to 5 hours of direct light or a bright indirect window.

Mint and parsley are the most forgiving in low light, which makes them the go-to choices for a north-facing window or a shaded kitchen sill. See best herbs for low-light kitchens and windowsills for the full shortlist.

What “full sun” really means indoors

Light through a window is far weaker than open sky, so a “sunny” windowsill often delivers less than a herb needs. If your brightest spot still falls short, the realistic fix is a grow light rather than a more tolerant herb. Whether that is necessary, and how herbs cope without direct sun, is covered in can herbs grow indoors without direct sunlight and how much light do herbs need.

Use the chart as a starting point

The hours above are targets, not hard cut-offs. Herbs given slightly less sun simply grow slower and more sparsely rather than dying outright. Match the herb to the light first, then adjust pot size and watering to suit; the companion pieces on watering by herb close the loop.

Hours do not describe all plant light

Two sites with six hours of “sun” can deliver different amounts of usable light because intensity changes with season, latitude, cloud, glazing, shade, and time of day. Outdoor recommendations are therefore not a literal guarantee for a plant behind glass. Daily light integral (DLI) describes the total photosynthetically active light received over a day, while PPFD describes the instantaneous photon flux at a position. A timer supplies duration; it does not tell you whether a lamp is bright enough across the whole canopy.

You do not need an expensive meter to make a better first decision. Record when direct light reaches the leaves on three representative days, compare candidate positions at the same times, and observe the spacing and color of new growth. A phone app can compare spots, but its reading is not interchangeable with a calibrated PAR measurement.

Read the plant without overdiagnosing it

Longer internodes, leaning, smaller leaves, and weak regrowth together support a low-light diagnosis. One yellow leaf does not. Saturated roots, temperature stress, pests, and nutrient problems can overlap with light symptoms, so check the whole setup before moving the plant or feeding it.

When adding a grow light, begin with the manufacturer’s coverage and clearance guidance. Keep a consistent photoperiod with a dark period, adjust based on measured output if available and plant response, and protect electrical connections from water. There is no single correct distance for every fixture.

A simple seasonal light audit

Repeat the three-day observation near the shortest and longest days of the year or whenever a tree, awning, or neighboring building changes the exposure. Label each herb’s position and note harvest or regrowth. If a sun-loving herb repeatedly stretches while parsley remains compact, reserve that position for the more tolerant crop or supplement the light.

Sources

• University of Minnesota Extension: Lighting for Indoor Plants and Starting Seeds
• Penn State Extension: Growing Herbs Indoors
• University of Georgia Extension: Herbs in Southern Gardens