A. The speed of the leaf drop suggests cold injury, probably during the move from store to living room.

The plant always recovers, but I don't see this leaf drop in shopping malls.

Are the trees showing signs of early leaf drop and weakened limbs?

In larger amounts though, they can induce leaf drop.

Gas heat or fumes from gas cooking can cause dramatic leaf drop.

However, in large numbers they can cause premature leaf drop and twig dieback.

The leaf drop is a normal process, not a disease.

The result is brown coloration of the needles and leaf drop.

Remember that doors opening and closing nearby can cause problems for pampered plants, particularly early leaf drop.