Whether your amaryllis need full sunlight depends on what stage of growth the plant is in right now. During active leaf growth after blooming, yes, give it as much direct sun as you can. But while the flowers are open, bright indirect light works better and keeps the blooms looking fresh for longer. The light needs shift throughout the year and getting this right makes a big difference in how well your bulb performs.
The amaryllis light requirements shift across three stages you need to know. While the flower stalk grows and buds open, place the pot in bright indirect light. Once the flowers fade and leaves take over, switch to the strongest direct sun you have. During dormancy your bulb needs complete darkness in a cool closet for 8-10 weeks. Missing any of these shifts weakens your bulb over time.
I tested amaryllis in every window of my house over the past few years. The results were clear. South-facing windows produced the straightest and thickest stalks with the biggest blooms. East-facing windows gave decent results but the stalks leaned hard and needed staking. North-facing windows were a total failure. The stalks came out thin and floppy with smaller flowers that faded fast.
My best performing bulb sits on a south-facing windowsill where it gets about 6 hours of direct sun each day during the leaf phase. That bulb has produced three stalks every year for the past three winters. I tried moving it to an east window one spring and the next season it only made two shorter stalks. Back on the south window it bounced right back to its full potential.
The reason light matters so much after blooming is pure biology. Those green leaves work as solar panels that convert sunlight into stored energy inside the bulb. This energy reserve is what fuels next year's flower stalks. Clemson HGIC recommends a minimum of 4 hours of direct sunlight each day during the leaf growth phase. Anything less and the bulb won't build enough reserves to produce strong blooms the following season.
The best window for amaryllis is one that faces south or west. These spots give you the most hours of direct sun each day. If you move your plant outside for summer, pick a spot with morning sun and afternoon shade. UF/IFAS notes that outdoor foliage can scorch under full all-day sun. Some shade from strong afternoon rays keeps your leaves healthy and working hard.
Here is my simple rule that has worked well across dozens of bulbs. Give blooming plants bright indirect light to make flowers last. Give growing leaves maximum direct sun to recharge the bulb. Give dormant bulbs total darkness to trigger new bud formation. Your amaryllis rewards you with bigger blooms every year when you match light to each stage.
One thing I wish someone had told me earlier is that rotating your pot matters just as much as light strength. Give the pot a quarter turn every 2-3 days during stalk growth. This keeps the stem growing straight instead of bending toward the window. A straight stalk holds up heavy flowers much better. Your amaryllis looks far more impressive when those big blooms open on a strong upright stem.
If your home lacks good south or west windows, you can use a grow light as a backup during the leaf growth phase. Set it on a timer for 12-14 hours per day and position it about 6-8 inches above the leaves. It won't replace real sunlight for blooming but it gives your bulb enough energy to produce a decent show next winter. Many of my gardening friends use grow lights in darker apartments and still get their amaryllis to rebloom each year.
Read the full article: Amaryllis Care: How to Grow and Rebloom
