A total of 2 reviews of this product on Reddit.
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My Calatheas almost bit the dust this winter. My C. Roseopicta’s leaves curled up much like yours are doing in this picture. My understanding is that the curling is a response to low humidity and/or sudden drops in temperature which can be cause by cold drafts.
I agree with everyone here when they recommend you get a humidifier. This humidifier is cheap and easy to clean.
However, my situation called for a more drastic approach. Even with the humidifiers going the humidity regularly dips to 25%. Had to build a makeshift terrarium. I bought a translucent tote, threw about an inch of LECA on the bottom, added distilled water, put a 1020 tray over that and put my calatheas in there. The humidity in there stays somewhere between 80% to 100% and they’re safe from hot or cold drafts. My C. Roseopicta’s leaves opened right up. Today I’ll be installing a small fan to improve air circulation to prevent bacterial/fungal problems. I think of it as a calathea hospital. lol
Winters are brutal for Calatheas. OTOH my monstera, tetrasperma, anthuriums, aglaonema, spaths etc. are unfazed.
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Check out my newest post! I’m running one of these solo in this same 2×4 tent now, but for flower, while the other 4 are in my new 4×4.
The humidifier I was using in this picture had too small of a tank so I just changed it for this one which I highly recommend:
