Q. I have a stromanthe triostar that’s has a brown dry spots - gets new growth but then they curl, don’t open fully and turn crispy
Triostar stromanthe (Stromanthe thalia 'Triostar') is such a pretty plant. The crispy leaf issue is, unfortunately, not unusual. The genus is closely related to Maranta and Calathea and, like them, needs extraordinary amounts of humidity. Misting is not enough.
At NYBG, we keep these plants in an very moist house in our conservatory where air misting is occurring constantly. A terrarium is the best way to keep your plant healthy in your home and give it the 60 to 80% humidity that it craves. You can also try a wet pebble tray under the plant and use a simple hygrometer to measure the level of humidity that you are achieving.
It needs moderate water, allowing the top inch of potting soil to dry between waterings. It is tempting to water more when what the plant really needs is humidity.
Maintain temperatures between 65 and 70º F. Keep your plant out of direct sunlight to avoid scorching leaves. I hope that you will see improvements!
Courtesy of NYBG Plant Information Service
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