Light
This is a sun plant. Clemson asks for a well-lit spot with at least four hours of direct sunlight a day, with a south window best and east or west second, and NC State lists it for full sun to part shade. In a dim room the stalk stretches toward the glass and can snap under the weight of the flowers. Turn the pot every few days so it grows straight.
Once the flowers open, you can move it out of the hottest light. The RHS suggests a cooler position at that stage to extend flowering, and a room near 65°F does more for bloom life than a sunny sill. After the last flower fades, return it to full sun: the long strap leaves need all the light they can get to refill the bulb.
| Range | Bright light to direct sun, best in direct sun |
|---|---|
| Foot-candles | 300 to 1,500 fc (3,229 to 16,146 lux) |
| Windows | South, East, West · needs some direct sun |
| Sources | Clemson Cooperative Extension; North Carolina Extension Gardener Plant Toolbox; University of Illinois Extension |
Water
Water the bulb thoroughly right after potting, let it drain, and then leave it alone. Clemson waits one week before watering again, and the RHS says to water sparingly until new leaves develop. A dormant bulb has few working roots, and wet mix around it invites rot long before you see a shoot. When the stalk or leaves appear, switch to keeping the mix slightly moist, watering whenever the surface feels dry, and never let the pot stand in a full saucer.
Demand peaks while the plant is in flower and the leaves are expanding, so check more often then. Clemson notes that watering frequency usually has to rise once flowering starts. Through spring and summer keep watering normally: the RHS traces many no-bloom bulbs back to under-watering during the previous summer.
The rest period is a deliberate drought. Clemson stops watering and fertilizing for 8 to 10 weeks, letting the leaves yellow and wither; NC State reduces water, removes the leaves once brown, and keeps the pot cool and semi-dark. Start watering again when the tip of a new flower bud shows, or when you bring the pot back into warmth.
| Rule | When the top inch is dry: water sparingly until leaves or the flower stalk appear, then keep the mix slightly moist and water when the surface feels dry |
|---|---|
| Winter | An amaryllis grows and flowers through winter, so water normally then. Its rest comes later: Clemson stops watering for 8 to 10 weeks to bring the bulb back into bloom, and NC State reduces watering until the leaves brown, then rests the pot at 50 to 55°F. |
| Watch for | A freshly potted bulb has few roots, and soggy mix rots it before it sprouts; Clemson waits a week after the first soak. |
| Water use jumps once the stalk is up and flowering, so check the surface more often then. | |
| Keep the neck of the bulb above the mix and dry, which Clemson says helps prevent red blotch. | |
| Sources | Clemson Cooperative Extension; North Carolina Extension Gardener Plant Toolbox; Royal Horticultural Society |
Soil and pH
Choose a pot just 1 to 2 inches wider than the widest part of the bulb; Clemson notes that potted amaryllis thrive slightly rootbound. Use a heavy clay or ceramic pot with drainage holes, because a tall stalk in full bloom tips light plastic. Clemson rates a mix of equal parts peat and perlite as excellent, and the RHS uses a loam-based or multipurpose compost. Set the bulb high, with one-third to one-half above the surface by Clemson's count, or two-thirds by the RHS's, so the neck stays dry.
| Mix | A free-draining, high-quality potting mix in a heavy pot only 1 to 2 inches wider than the bulb; Clemson rates equal parts peat and perlite as excellent. |
|---|---|
| Ingredients | peat or peat-free potting mix, perlite, loam-based compost (RHS John Innes No.2) |
| Sources | Clemson Cooperative Extension; Royal Horticultural Society |
Humidity
Humidity is not a concern for this bulb. None of the extension sources sets a requirement, and the plant flowers happily in the dry air of a heated home in December. Skip misting: water sitting on the neck of the bulb is more likely to encourage red blotch than to help the plant.
Temperature
Warmth starts the bulb and coolness keeps the flowers. Clemson wants 70 to 75°F (21 to 24°C) until roots form and the stalk is growing, then about 65°F (18°C) once it blooms; the RHS gives 60 to 65°F (15 to 18°C) for flowering plants. During the rest, NC State keeps the bulb at 50 to 55°F (10 to 13°C), and the RHS around 55°F. NC State adds that the plant is injured below 35°F, so a summer outdoors ends before the first frost.
| Minimum | 50°F (10°C) |
|---|---|
| Ideal | 65 to 75°F (18 to 24°C) |
| Humidity | Average room humidity. None of the sources sets a humidity need: this bulb grows in ordinary room air. |
| Sources | Clemson Cooperative Extension; North Carolina Extension Gardener Plant Toolbox; Royal Horticultural Society |
Fertilizer
Do not feed a bulb that has no leaves; Clemson warns that fertilizer can kill the roots at that stage. Once the plant is growing, feeding is what builds next year's flowers. Clemson uses a liquid houseplant fertilizer twice a month, diluted according to the label, and the RHS applies a balanced liquid feed weekly after flowering while the leaves grow on. Keep it up through summer, then stop when you begin the rest.
| When | From the time leaves grow after flowering until the late-summer rest; nothing on a bulb without leaves, every 1 to 2 weeks, reduced in winter |
|---|---|
| What | Liquid houseplant fertilizer diluted per the label, balanced, label rate |
| Sources | Clemson Cooperative Extension; Royal Horticultural Society |
Work out the dose for your watering can with the fertilizer dilution calculator →
Repotting
Amaryllis bulbs like a tight fit and do not need a new pot every year. The RHS repots every two or three years, between January and March after flowering. At that point, knock the bulb out, trim dead roots, replace the old mix, and move up only if the bulb has grown; the pot should still be just an inch or two wider than the bulb. In the years between, the RHS refreshes the top 1 to 2 inches of compost after the rest.
- Offsets crowd the main bulb against the rim
- Roots push the bulb up out of the mix
- Flowering weakens after two or three years in the same pot