Many people don’t give enough attention to this beautiful plant’s needs. After a few weeks, they notice it wilting, yellowing, or dropping leaves, and the once festive poinsettia looks so sad that it’s easier to toss it out.
Your Poinsettia Will Tell You What It Needs
Here’s good news if you’ve felt guilty about a struggling poinsettia: with a bit of care, you can grow a lush, red-leafed beauty that might even brighten your home next summer. The trick is pretty unique and calls for a large cardboard box.
Native to Mexico, poinsettias can grow into tall shrubs or small trees there. They arrived in Europe in the 1960s, and thanks to breeding, the familiar 10-60 cm (4-24 inches) indoor plants we know today were developed.
Poinsettias are great at communicating their needs—if you know how to read their signals. If unhappy, they drop some leaves, hinting it’s time to move them to a brighter spot or cooler room. When thirsty, their leaves droop sadly but perk up quickly after watering. Catch these signs early, and you can save your plant from decline.
Some gardening sites suggest cutting back the poinsettia once it drops its red leaves and grows green ones instead, usually around February. But there’s another way to encourage red leaves instead of green ones.
Grab a Cardboard Box
To keep your poinsettia’s leaves bright red for months, it needs at least 12 hours of complete darkness daily. You can tuck it away in a closet or simply cover it with a large cardboard box each day.
It might sound odd to keep a plant in the dark on purpose, but poinsettias thrive on this routine. Think of it as putting your plant to bed at night and waking it up in the morning. In return, it rewards you with stunning red leaves.
As long as you meet its other needs—regular watering and a cool spot (no warmer than 20-21°C / 68-70°F)—your poinsettia will soon outgrow its box. Feeding it a little fertilizer every two weeks or monthly will boost its growth.
If you follow this routine and provide 12 hours of darkness daily, your poinsettia could grow up to four times bigger by mid-summer. Then, you can move it outdoors—it’s actually a perennial plant!
This method also lets you time when your plant turns red. Even a fully green poinsettia from last year can be encouraged to grow colorful leaves—definitely worth trying!
There are also poinsettias in other colors like yellow, pink, purple, and even blue. The author hasn’t tested the 12-hour darkness trick on these yet, so the results are unknown. But as they say, good things come to those who wait.
