Answer: No, this is not normal at all and unfortunately it really doesn't sound very good. This tree usually holds its foliage into the fall and it drops at the normal time. Based on your description it sounds like the tree may be dead. You may want to consult on site with a professionally trained and certified arborist or possibly with your county extension to determine more specifically what might have happened. I suspect it suffered from the fairly widespread vascular problem of mimosa wilt, a fungal disease which usually becomes apparent by progressive wilting and yellowing and sometimes also includes symptoms of exudation and gummosis (oozing gooey sap)on the trunk. There is no cure for it and since it lives is in the soil, it will infect a new mimosa tree planted in the same spot. I'm really sorry about your tree.
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