check soil PH. you almost certainly want a bigger pot (transplant it leaving as much of the earth around it as possible to prevent shock.)
Overwatering and too much sun can be a problem too.
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Hot: 2001 Estoril M RoadsterZCP 19's michelin PSS, ZHP knob, JL 8W3
Cold: 2002 TiAg M3 6mt
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