Dendrobium Nobile Flowers at Base of Cane

[DaveL]

I have a Dendrobium Nobile (Irene Smile) that for the second year running is producing flower buds from the base of the canes before new canes. Last year there were also very few sporadic flowers from the canes and eventually I did get two new canes. Can anyone help me and suggest what I may be doing wrong. The plant is growing indoors by a North facing window with overhead grow light.