Rhododendron Bud. .Lumix FZ200. - Mid-spring Blooming Rhododendrons Make Their Flower Buds In July To September, But Will Not Open Until The Following Year. Many Customers Ask "Why Didn't My Rhododendron Bloom? They Had Flower Buds!" If You Know What The Difference Between A Flower Bud And A Leaf Bud, You Will Not Be Surprised Come Spring As You Will Be Able To Recognize Which Plants Have Made Flower Buds The Year Before They Bloom. On Most Rhododendrons, Flower Buds Are Larger, And Round Like A Marble. Leaf Buds Are Small And Pointed. Photo