How much do I trim a wysteria plant?

How much should I trim my wysteria plant. It still has leaves, but lots of tiny 4" long branch spikes growing out of the stems. It is in a large pot and I am wondering if I should cut all of these spikes or leave them alone. I want to hopefully have flowers this year. Thanks for any answers I live in LA area in Calif, so not much rain, It is in full sun

  3 answers