I have a Dendrobrium orchid which is growing extremely well. I have a greenhouse window in my kitchen and it is grew so well - I had to split it into two plants. Both are doing well.
However, I also have an anthurium and an alocasia which are not doing well in the same location - I have moved them to a more indirect light source and they are still not doing well!! Any ideas?
How bright is the light and what direction does your greenhouse window face? Anthuriums don't like really high light. Alocasias are a challenge to keep going indoors over the winter - they tend to get spider mites or rot, even for experienced growers.
How is your Anthurium potted? Keep it in light shade, give it orchid potting mix. The Alocasia like stronger light, and likes to be constantly moist. Just clean the leaves and you should not have to worry about mites too much. They are easy to kill.
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"We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
My anthuriums will take very early morning sunlight after that they are back'd away in shade, or underlights with the orchids. They're potted in an open mix - 50 peatmoss, 25% bark and 25% small perlite. They are kept moist.
If their getting to much light, they will turn lime green to yellow in color.