Hydrangeas are tricky to prune. New-wood ï¬owering hydrangeas can be pruned each early spring, just as the new growth ⦠You can prune ⦠Bigleaf hydrangeas (Hydrangea macrophylla cvs., USDA Hardiness Zones 6â9) Bigleaf hydrangeas (H. serrata cvs., Z 6â9) Oakleaf hydrangeas (H. quercifolia cvs., Z 5â9) Prune after the flowers start to fade in late summer. Oakleaf Hydrangeas. It would depend on your hydrangea type and if your Hydrangea blooms only on old wood, only new wood, or both old and new wood. It is important for anyone who has mophead hydrangeas to understand that these particular shrubs do not have to be pruned back at any time unless they have seen better days or are have grown a little too large. Be sure to remove only a third of the total growth of the plant. Adding to the frustration is the fact that in colder climates old wood hydrangeas can fail you, even when you follow the old wood pruning rules. Shrubs like hydrangeas flower from mid to late summer on the previous year's growth. There are two separate varieties of hydrangeas, one blooms on old wood growth, while the other blooms on new growth. Old Wood. This group of hydrangeas produce flower buds on hydrangea stems around August, September or October for the following summer's blooms. Hydrangeas that Bloom on Old Wood - set their flower buds for the next year the previous summer. Blooming occurs on old wood, and the plant's pruning needs are minimal. Time to prune your hydrangeas, but not all of them. Also donât forget to remove spent flowers from your plants. However,in most climates, hydrangeas that bloom on old wood finish flowering so late in the season that pruning them after they bloom doesnât leave enough time for them to regrow ⦠Old ⦠4. Pruning hydrangeas is one of the hardest things for gardeners to grasp since it varies by species and itâs not a once a year thing. Pruning Hydrangeas that Bloom on Old Wood. Hydrangeas with this characteristic begin forming next yearâs buds in late ⦠Panicle Hydrangeas. Hydrangeas can be broken down into two main types, those that bloom on Old Wood and those that bloom on New Wood. This plant is sometimes confused with Hydrangea macrophylla because of their similar flowers. The b est time to shorten the hydrangea or give it shape is spring when the plant has woken up from hibernation. Mophead and lacecap hydrangeas will bloom satisfactorily with little attention, but regular pruning encourages new, vigorous growth that can produce a better display. Pruning. This hydrangea, which grows on old wood, doesn't need much pruning but if you want to control its shape or size, clip in the summer before August when flowers' once-vibrant colors begin to fade. "New wood" are stems that developed on the plant during the current season. Instead, site these hydrangeas appropriately so they do not need to be pruned, and choose varieties that do not get too big for their space. Prune after it flowers, trimming back flowering stems to a pair of healthy ⦠Old style mop head hydrangeas bloom on old wood, so if you cut them way back after blooming, you are likely cutting off next yearâs blossoms! The sooner you prune an old-wood hydrangea, the better it will be as itâll give the shrub a time to recover before winter and will produce larger blooms next year. Prune these shrubs as soon as the blooms begin to fade in late summer to prevent cutting off next yearâs blooms. However, this type doesn't have the big leaves of Hydrangea macrophylla. Oakleaf hydrangea Photo: Ginny Williams. The two commonly cultivated hydrangea species that bloom on new wood are: Hydrangea paniculata, which are commonly called panicle or PG hydrangea, such as Pinky Winky and Limelight. ; Hydrangea arborescens, commonly called smooth hydrangea, such as Incrediball. Hydrangeas will have a lack-lustre display of blooms if the buds are removed. The first thing you should find out is whether your shrubs are blooming on old wood or new wood. Removing the dead stems from an old bush is really the only pruning that you need to do to keep this plant healthy. ; Keep in mind that maintenance pruning, which includes removing diseased and dead wood as well as deadheading old ⦠Pruning in winter or spring would remove the flower buds, leaving us with a bloomless plant this year. Place after it flowers depends on whether your shrubs are blooming on old wood immediately... The massive, upright, 12-inch blossoms wood or New wood species you can prune back the hydrangea without New... 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