Endless Summer does flower on new growth, but most of the flowers are developed on old wood. These elegant, long-blooming shrubs boast uniquely shaped bloomheads and handsome foliage. Hydrangeas that bloom on old wood include the mophead, bigleaf (macrophylla), lacecap and oakleaf varieties. Older cultivars bloom on “old wood” which means that flower buds develop on the stems during the summer the year before they bloom. Plants described as blooming on new wood can be pruned anytime without risking the current season’s flowers. Take careful note, however, that this advice applies only to the particular kinds of hydrangeas and spireas (because other types flower on the prior year's growth; for example, oakleaf hydrangea). Therefore, if you are going prune, try to do it as soon as possible after they are done blooming and by August 1 at the latest. Once again, a light cut to remove dead growth once summer’s over is all you need. Hydrangeas That Bloom on Old Wood. By doing this, you will avoid removing any of the developing flower buds. They develop these buds sometime between August and October for the following summer’s blossoms. If your hydrangea flowers on old wood, it makes new flowers on any branches left to grow for a year. So for you in zone 8 you won't notice any problems since the blooms on old wood will do just fine, and any blooms it gets on new wood will just be an added bonus. This is because they require extra time to create buds. Hydrangeas that bloom on old wood start to develop their flower buds for the next year in August and September. There are some varieties of H. macrophylla that are reblooming, or remontant, meaning these cultivars will produce flower buds on both old and new wood. Some types of hydrangeas bloom on both new and old wood. Timing is everything! By doing this, you will avoid removing any of the developing flower buds. Old wood blooms. Since Endless Summer ® Hydrangeas bloom on last year’s growth (“old wood”) as well as the current season’s growth (“new wood”), you will get the most flowers by protecting the flower buds on the old wood. That’s because a reblooming hydrangea can put out flowers from the length of the stem even when the terminal bud dies. Many hydrangeas bloom on old wood, or old and new wood, so by trimming them or cutting them back, you cut off the buds that are forming for the next year. If you cut any old wood hydrangeas now, you will cut off the buds. With handsome, glossy foliage and gorgeous ball-like … To determine if your hydrangea blooms on old wood… Do they bloom on old or new wood? I sure cannot wait to put my flowers in the ground and watch them grow. Also called Hydrangea petiolaris, these can grow 30 to 80 feet long. Incorrect sun exposure. If there is a problem it is politely and effectively addressed. They had a beautiful selection of flowers and quickly found what I was looking for. 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