The American hydrangea, sometimes known as the smooth hydrangea, is a deciduous shrub that reaches a height of 5 feet (1.5 metres). The small populations in New England, which are native to most of eastern North America, are regarded as introduced because they are primarily found in disturbed environments. In contrast to showier cultivated hydrangeas, its clusters of somewhat little white blooms are modest but bloom for a long time. Additionally, the plants can survive in rain gardens, are helpful for erosion management, and are tolerant of poor soil conditions.
Do hydrangeas naturally occur in Massachusetts?
One of the most well-liked flowering shrubs for Massachusetts settings is the hydrangea. Indeed, one of the distinguishing features of the Cape Cod garden is the “blue” hydrangea (Hydrangea macrophylla or bigleaf hydrangea). Hydrangeas offer colour and beauty throughout the summer and into the fall, whether they are used as a specimen flowering shrub, in a mixed planting with perennials, or in the shrub border.
In our landscapes, hydrangeas of various species are grown. They all generally have comparable cultural expectations. The ideal soil for hydrangeas is one that is continuously moist, well-drained, and rich in organic matter like compost or well-aged manure. They are not particularly resistant of dryness and do not do well in extremely dry, sandy soils. Hydrangeas typically require one inch of water per week, applied in a deep soak. They may need up to 2″ of water every week to avoid wilting in extremely hot and dry weather. In a shrub border of hydrangeas, drip watering or soaker hoses work well since they maintain the soil’s moisture while also keeping the leaves dry, lowering the risk of leaf spots. You may grow hydrangeas in either full sun or dim shade. Particularly the bigleaf hydrangea, which may wilt in full sun even with moist soil, does well if shielded from the intense afternoon heat.
When fertilising hydrangeas in the early spring and again after blossoming, use a balanced fertiliser weighing about 4 ounces. Hydrangeas prefer a moderate amount of nutrients in the soil. Check the quality of the roots of container-grown plants before planting, and if the roots appear to be circled around the pot or pot bound, loosen them. Add organic material to the planting area and position the plant at the same depth as in the container. The surrounding soil should be level with the top of the root ball. Apply 2 to 3 inches of high-quality mulch over the new plant’s roots, keeping the mulch away from the plant’s crown. Water the new plant thoroughly.
The smooth hydrangea (H. arborescens), which grows as an understory shrub in forests, is a native of the Eastern United States. This species prefers plenty of moisture and partial shade. It develops into a spherical shrub that is 3 to 5 feet high and 3 to 5 feet broad. It blooms in late June or early July, with clusters of 4″ to 6″ wide white flowers. Popular cultivar “Annabelle” produces enormous flower heads that can measure up to 12″ in diameter. The open, lace-cap flower head of the “White Dome” survives well in heavy rain. Pruning should be done in late winter or early spring before new growth starts since smooth hydrangeas bloom on new wood. Zone 4 is the hardiest, however smooth hydrangea may die back to the ground in a very cold winter. As long as it develops flower buds on new wood, it will continue to bloom the next year.
During the month of July, the bigleaf hydrangea (Hydrangea macrophylla) is one of the prominent plants in the landscape. It has an even spread and a height range between 3 and 6 feet, with a rounded habit made up of numerous stiff, unbranched erect stems. Springtime leafing is delayed, and during particularly chilly winters, it can die back to the ground. The Hortensia group of bigleaf hydrangeas features flower clusters made up of several sterile blooms arranged in enormous globes. The Lacecap group is composed of a flat-topped cluster of gorgeous sterile flowers surrounding a centre of tiny, fertile flowers.
Bigleaf hydrangea flowers frequently vary in colour, with hues ranging from deep pink to red and deep pink to white. Bigleaf hydrangeas need specific pigments in order to turn pink or blue. The blossom will be a shade of blue if there is aluminium in the soil. If there is no aluminium present, the blossom will be pink. Aluminum availability is influenced by soil pH: it is more readily available in low pH soils and less readily available in high pH soils. Flowers will be blue if the soil pH is 5.5 or lower and pink, rose, or red, depending on the cultivar, if the soil pH is 6.5 or higher. The amount of pigment present in a particular cultivar determines the color’s intensity. While “Dooley” will always be either rich blue or rich pink, “Nikko Blue” will always be one of those colours.
Regarding Bigleaf hydrangea pruning, there is a lot of misunderstanding. On mature wood, flower buds often form in the summer and blossom in late June or early July the following year. On the stem’s tip, there is the main flower bud, and there are more buds forming lower down in the leaf axils. These secondary buds do not blossom if the main bud does. Some of these buds might bloom if the main bud is winter-killed. However, freezing weather in the early fall and late spring, as well as winter temperatures below 10 oF, may completely destroy all flower buds, resulting in little to no bloom the next year.
Simply pull out wilted flowers the first several years after planting when they turn brown. Just above the following row of leaves, trim them off. Maintain a healthy structure as the plant ages by cutting the oldest stems (3 years+) all the way to the ground in late winter. At that time, you should also remove any dead stems and tips. If a Bigleaf hydrangea needs to be pruned to control height, do it as soon as the flowers start to fade, right above a set of leaves. Even better, plant it where it will be able to reach its full height and width.
Bigleaf hydrangea breeding advances have led to the creation of cultivars that can bloom on both young and aged wood. This “remontant” quality enables blossoming even when the flower buds are killed by the cold. Among the cultivars with this reblooming ability are “Endless Summer,” “Penny Mac,” and “Dooley.” Up to zone 6, bigleaf hydrangeas are hardy.
The Panicle hydrangea (H. paniculata), sometimes known as the Pee Gee hydrangea, has been utilised in the landscape for many years. With an equivalent spread, this substantial shrub or small tree can grow to a height of between 10 and 20 feet. It blooms from July to September, when huge, 6- to 8-inch-long pyramidal panicles are produced. Fluffy fertile blossoms are dotted throughout the showy, sterile flowers that make up the panicles. The blossoms begin as white but gradually turn a mauve-pink colour that lasts throughout the fall. Panicle hydrangeas are the most versatile type of hydrangea. It is the most resilient of the species and is more tolerant of dry spells and direct sunlight. It blooms on fresh wood; if necessary, trim in late winter or early spring to control height. Zone 3 is the hardiest for panicle hydrangeas.
The traditional Pee Gee hydrangea has the cultivar name “Grandiflora,” and it frequently takes on the form of a tree with just one main trunk. Heavy flower clusters, 12 to 18 inches long, allow the branches to arch over, giving the arrangement the appearance of a fountain. Better plants for the garden can be found in more recent varieties that have entered the market. With more fertile than sterile flowers, “Kyushu” is a robust, erect variety that has an open, airy appearance. Lime green flower buds on the 6 to 8-foot-tall and wide ‘Limelight’ plant open to a delicate greenish-white tint. The late flowering cultivar “Tardiva” blooms from late August to October and reaches heights of 8 to 12 feet. A short cultivar, “Little Lamb” only grows to a height of 4 to 6 feet. It also has tiny, delicate flowers, with flower heads that are described to resemble “little lambs dancing around the stem.”
The southeastern region of the United States is home to the native oakleaf hydrangea (H. quercifolia). Its enormous, lobed leaves can grow up to 8″ long and 5′ broad, resembling oak leaves. The 8′-tall oakleaf hydrangea has upright stems that develop in height. By growing stems from the roots, it gradually clumps together, and as it ages, the bark turns shaggy and reddish. Large, white, conical flower heads with both fertile and sterile blooms start to bloom in July. The base of the flower heads can be up to 4″ wide and 12″ long. The blossoms stay beautiful throughout the fall as they mature and dry to a lovely pink-mauve colour. The scarlet and burgundy hues of the autumn foliage can be stunning. The flower buds grow on aged wood; if necessary, prune right away after bloom.
The cultivar known as “Snow Queen” has been available for some time and is excellent. It has a more compact growth habit and can withstand the sun well, maturing to a height of 6′. It has creamy white flower heads that are 6 to 8 inches long. One of the more recent varieties, “Alice,” grows to a height of 10 to 12 feet and is particularly strong. Large flower heads up to 12 to 14 inches long with florets the size of a fifty-cent piece are produced by this plant. Multiple bracts on the flowers of “Snowflake” give the impression that they are doubled. The 12 to 15-inch flower heads are so massive that they arch over, giving the impression of weeping. This variety favours moist soil and some shade. With a petite design that only grows to be 3′ tall by 3′ broad, “Pee Wee” is a wonderful choice for smaller gardens. The flower heads are also small, measuring only 5″ in length. Fall colours is good in “Pee Wee.” Zone 5 is the hardiest for oakleaf hydrangeas.
Despite not being a shrub, climbing hydrangea (H. anomela petiolaris) is one of the most magnificent climbing vines that is now accessible. Although it has the same growing conditions as other hydrangeas, it takes longer to mature after planting. Once established, it might climb as high as 60′. The climbing hydrangea ascends by using holdfasts that resemble roots to cling to surfaces. It is frequently positioned next to walls or other structures, especially at the base of large trees. It blooms in June, giving out huge, flat lace-cap-like flowers that can be up to 10″ wide and last for up to two weeks. The horizontal extension of the flowering stems from the surface they are growing on frequently gives the plant a three-dimensional appearance. Golden yellow is a fall hue. This vine is very lovely. Up to zone 4, climbing hydrangea is hardy.
In reference to the design of its seed capsules, the name “hydrangea” is derived from the Greek and meaning “water vessel” (from water + or vessel).
[4] The former name, Hortensia, is a Latinized version of the French given name Hortense and was given in honour of Nicole-Reine Hortense Lepaute, a French astronomer and mathematician.
[5] This statement is refuted on page 88 of Nicole-Reine Hortense Lepaute’s biography, citation 10, where it is stated: “Larousse considers this an injustice and remarks that it has caused many people to believe falsely
Do hydrangeas grow naturally in the USA?
Two hydrangea species, Hydrangea quercifolia (oakleaf hydrangea) and Hydrangea arborescens (smooth hydrangea), both woody shrubs, are native to the North American continent and have been cultivated for use in landscaping on a commercial scale. Other hydrangea species have been used in landscaping, and a related, the loosely clinging vine Decumera barbara, appears to be fighting for acceptance as a garden plant. However, the oakleaf and smooth hydrangeas are the most prevalent North American species in the nursery industry. Hydrangea arborescens, known by its cultivars ‘Grandiflora’ (also known as ‘Hills-of-Snow’ hydrangea in older gardening literature), ‘Sterile,’ and, more recently, ‘White Dome’ (also known as ‘Dardom’) and ‘Annabelle’ (and her enormous-flowering cousins like Incrediball), is likely the North American hydrangea species that has been used in general gardens
Both the smooth and oakleaf varieties are native to damp woodlands with a variety of hardwood trees, and they both do well in soils that retain moisture and are rich in organic matter (naturally, that would be decomposing leaf and twig litter found on the forest floor). However, the inflorescence form (creamy white cones of flowers on H. quercifolia that age to red and brown, and creamy white spherical dome or ball-shaped that age to silvery-tan on H. arborescens) and foliage pattern of these shrubs differ in appearance (thick, large oakleaf-shaped foliage on H. quercifolia, and thin, flat green leavesthat are prone to wilting in summer heaton H. arborescens). This last characteristic determines when and how the plants can be pruned without damaging the flowering effect, as well as whether winter cold and late frosts might reduce the flower display. These two species also differ in flowering time (early or midsummer), and when they develop their flower buds. The early American botanist John Bartram first identified the Hydrangea quercifolia, which is native to a smaller area of the southeastern states and is winter hardy down to -15F. However, because it develops new flower buds the year before each flowering season, it may not reliably flower in the coldest climates (USDA zone 5), despite having lush and beautiful foliage. On the other hand, H. arborescens is more dependable for floral display because its flower buds form on new growth, that is, on a mass of stems that emerge (typically suckering from close to the ground) the current season. It is a native of moist rocky cliffs and seeps from New England to Missouri as well as southeastern states.
H. arborescens is perhaps the easiest of the native North American hydrangeas to grow across a greater area of the temperate zone since you can trim it to the ground each spring and expect vigorous new growth with a nice flower show that summer. Additionally, it can withstand moister soils that are heavier in clay or less “well-drained” and is winter-hardy in one or two colder zones (often zone 4, however other sources claim H. arborescens can thrive in the warmest regions of zone 3!). H. quercifolia, on the other hand, is a more sophisticated plant whose leaves turn a deep burgundy and orange hue in the fall. Its coarse and rocky structure and peeling coppery-tan bark also lend interest to the landscape in the winter, making it showy beyond its summer flowering season. While the oakleaf cultivars make excellent specimen plants and tolerate slightly drier soil conditions if shaded from the hottest sun of the day, the smooth hydrangea tends to wilt easily and is best used in moister sites, especially if it is to bake in sun during the hottest time. Its suckering habit also lends itself to massing and use as a summer hedge.