Can you see the flower bud?
I purchased this Dracaena Fragrans for Gogo a few years ago in the flower market. In Hong Kong it is called Brazilian Iron Tree.
It was then just a segment of stem - cutting out from the stem of a large Dracaena Fragrans tree - with a few leaf buds only and had no root at all. Gogo wished to keep it so we bought it home.
We first kept it in a vase with some water. The plant grew larger with leaves and roots developed. We then transferred it to the soil.
It appears to be rare and unusual for a Dracaena Fragrans flowers in winter.