Quince flowers in March and the flowers drop away as the bush starts leafing out.
Notice that the other plants in the area haven't even started getting leaves yet.

March 16, 2008.
Click here to see Quince flowering in snow.

In 2009, for the first time, the Quince bore fruit:

April 25, 2009:
Planted three orange quinces to the side of the red one:

March 31, 2010:
They haven't gotten very big by 2015, but by 2010 they did have some flowers: