Re pot. Consider using pine bark around grade 3. These Dens. like plenty of air around the roots. When you are watering water the plant medium not the plant. A part of its growth treatment mix up a weak dose of Epson salts 1 table spoon to around 1 gallon or 4 liters of water. Water the medium first then apply a coupe of cups of this mixture if you do that for a couple of times you should start to notice some positive change. You can use this mixture on any plants at the start of their respective growth cycle.
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