Amaryllis need bright, indirect light indoors with at least four hours of direct sunlight daily during active growth, and full darkness during dormancy.
Getting the light right for an amaryllis is the single most important factor between a bulb that produces one sad, leaning stalk and one that throws multiple sturdy flower stems year after year. The rule changes completely depending on whether the plant is actively growing, blooming, or resting. Here is exactly what to give it in every phase, indoors or out.
The Indoor Light Rules During Active Growth And Blooming
Amaryllis need bright light with some direct sun during their growing and flowering phase. Place the plant in a well-lighted area near a south-, east-, or west-facing window — southern exposure is ideal. Direct morning sun is fine, but harsh all-day direct sun indoors can fade the blooms and scorch the foliage. Clemson HGIC recommends at least four hours of direct sunlight daily for best results.
The plant is naturally top-heavy, so pair that bright spot with a stable, heavy pot to keep it from tipping over. Rotate the pot every few days by a quarter-turn. A leaning flower stalk is almost always the result of the plant stretching toward one light source over several days, not a problem with the bulb itself. If you already have a lean, rotating for a week will straighten it back out.
What Outdoor Light Works For Amaryllis
If you move amaryllis outdoors after the last frost date, the light rules shift. The University of Minnesota Extension recommends full sun for at least 6–8 hours daily for outdoor planting. In very hot climates, part-shade during the afternoon reduces heat stress. The key is to acclimate the plant gradually — move it to shade or indirect light first for a few days, then increase sun exposure over a week. Going straight from an indoor windowsill into full afternoon sun will burn the leaves.
Bring outdoor pots back inside before the first frost. Amaryllis cannot tolerate freezing temperatures, and cold damage to the bulb is permanent.
The Dormancy Phase: No Light At All
Once the leaves yellow and die back naturally, the bulb enters dormancy. At this point, the plant needs no light whatsoever. Store the bulb in a cool, dry, dark location — a basement shelf or a closet works fine — for 8 to 12 weeks. Do not water during this period. Light during dormancy can prevent the bulb from resetting properly, which reduces the next season’s bloom quality. When you’re ready to restart growth, move the bulb back to its bright indoor spot and begin watering again.
| Growth Phase | Light Needed | Best Window |
|---|---|---|
| Active growth & blooming | Bright indirect + 4+ hours direct sun daily | South, east, or west facing |
| Outdoor summer | Full sun 6–8 hrs daily (part shade in hot climates) | Gradually acclimate from shade |
| Dormancy | None — total darkness | Cool, dry, dark storage for 8–12 weeks |
If your home lacks a window that delivers the right light, a quality grow light for amaryllis provides a reliable alternative, especially during shorter winter days.
FAQs
Can amaryllis get too much sun indoors?
Yes. Harsh, all-day direct sun through a window can fade the flower petals and scorch the leaf tips. Bright indirect light with some morning direct sun is the sweet spot for indoor plants.
What happens if I don’t give amaryllis enough light?
The flower stalk will stretch and lean toward the window, the blooms will be sparse or smaller, and the bulb will not store enough energy for the next growing season. Weak foliage and no flowers the following year are the most common results.
Should I use a grow light for amaryllis in winter?
A grow light is useful if your brightest window still provides less than four hours of direct sun. Place the light six inches above the plant and run it 12–14 hours daily. The best grow lights for amaryllis deliver the full spectrum the bulb needs to produce strong flower stalks during short winter days.
References & Sources
- Clemson University Home & Garden Information Center. “Amaryllis.” Recommends four hours of direct sunlight daily for indoor growth.
- University of Minnesota Extension. “Growing amaryllis.” Describes full sun requirements for outdoor plants and dormancy storage.
- North Carolina State University Extension. “Hippeastrum (Amaryllis, Barbados Lily).” Details light and growing conditions for the species.