Certified GKH Gardening Expert
It could need a little help with feed! For flowering, you will want to focus on phosphorus and potassium, but you won't go wrong with an all-purpose fertilizer.
Do not do this, often, and only apply the fertilizer at 1/4 strength. You should only do this when it shows signs of lack of flowering. And I will mention that a very low nitrogen fertilizer is preferred to an all purpose.