I purchased a climbing hydrangea 3 years ago. The plant is thriving (has grown from 1 foot to over 3 1/2 feet tall with sprawling foliage) but has not yet bloomed. Someone told me I had to nourish the plant with epsom salts. Is this right? Is there some other magic ingredient? When is the best time to feed this plant and when can I expect to see blooms?

Beth