One of the most well-liked hydrangeas in our gardens is Hydrangea macrophylla (Big Leaf Hydrangea), which is native to Japan. This deciduous shrub has a rounded form, big, strong leaves, and lovely clusters of June flowers that bloom for a long time. The Mophead Hydrangeas and the Lacecap Hydrangeas are the two subspecies that make up the species.
- Large, spherical flower heads covered largely in showy, sterile florets are produced by Mophead Hydrangeas or Hortensias. The blooms will continue to bloom nonstop throughout the summer, for a period of three to six months, until October arrives and they begin to change color. Rich blues that turn wine-red can be quite spectacular, as can whites that turn pale green or even blood-red.
- The flattened flower clusters that Lacecap Hydrangeas create are made up of showy, sterile florets that radiate out from a core cluster of tiny, fertile florets. The lacecap blooms will fade much more quickly than the mopheads since the fertile florets will be pollinated, only holding their beauty for around a month.
- Deep blues, vivid pinks, pure whites, lavender, and intense red and purple hues are just a few of the many colors available. The majority of Hydrangea macrophylla varieties have the additional allure of changing color according to the pH of the soil. These species can grow blue blooms in highly acidic soils, whereas pink flowers can grow in somewhat acidic soils. If you want your Hydrangea’s blossoms to be a different hue, you can amend the soil with aluminum sulfate to make them bluer or with lime to make them pinker.
- Zones 6 through 9 are hardy, Bigleaf Hydrangeas prefer a thick layer of mulch all year round because they are more susceptible to cold than their relatives (shredded bark, peat or compost ). This will control weed growth, hold onto moisture, and lessen soil temperature swings.
- Bigleaf Hydrangeas prefer sun to partial shade and do best in rich, medium-moisture soils that drain well. They can only survive full sun if the soil is continually moist.
- No significant pest or disease problems. Keep an eye out for leaf spots, mildew, bacterial wilt, and bud blight.
- Perfect for container and foundation plantings. grouped in a protected area or used as a decorative plant. They work well as a hedge and also make wonderful cut flowers! Perfect for gardens near the sea because of their hard, glossy leaves, which can tolerate wind and salt.
- After flowering, Bigleaf Hydrangea stems should be trimmed by being cut down to two sound buds. In the early spring, remove weak or winter-damaged stems.
Where should Hydrangea macrophylla be planted?
The most popular hydrangeas in our gardens are the lacecap and mophead varieties of Hydrangea macrophylla. While lacecaps have flattish flower heads with huge outside petals and tiny flowers in the center, mopheads have complete, circular heads of enormous petals. Depending on your soil type, plants are often rounded with mid-green leaves and pink or blue flowers. While alkaline soil produces pink blooms, acidic soil produces more lilac flowers.
Hydrangea macrophylla should be grown in wet, well-drained soil with full sun to light shade. Take cover from the chilly, drying winds. In the early spring, prune established plants severely to encourage new, healthy growth. To encourage the plant to develop new shoots, prune out between a third and a quarter of the previous year’s growth to the base each year.
When ought I to purchase hydrangeas?
During the growth season, nurseries will have potted hydrangeas for sale. If at all possible, purchase your plant when it is in bloom to ensure that you have the flower kind and color that you desire. To see the hydrangea’s roots, you should be able to lift or slide (lay the plant on its side) it out of its container. White roots with brownish tips represent healthy roots. Don’t buy it if the soil smells like sewer gas and the roots are discolored. That plant has root issues, and after it is planted, it might not survive.
Is Hydrangea macrophylla a yearly or perennial plant?
In contrast to annual shrubs, which disappear after just one season, hydrangeas are perennial shrubs that grow again every year.
Having said that, some hydrangeas from nurseries or offered as gift plants are regarded as annuals because they wither up quickly and don’t grow back.
They are not perennials, but rather they are not winter hardy in the region where they are grown for commercial purposes.
Needs full sun for hydrangea macrophylla?
both temperature and light. Despite the fact that these plants enjoy bright lighting, it’s important to avoid giving them too much full sun or direct sunlight because this could harm them. Early morning sun and some afternoon shade are ideal for plant growth. Extremely hot or dry weather are not suitable for hydrangeas.
Why isn’t my macrophyllous hydrangea blooming?
- One of the most frequent causes of Hydrangea macrophylla failure to bloom is improper pruning. Older cultivars bloom on “old wood,” which refers to flower buds that form on stems in the summer of the year before they bloom. More recent cultivars have been bred to bloom on both fresh and old wood, which means that buds form on both the growth from the current and previous seasons. Pruning should be done in the spring when new growth has resumed and it is easier to distinguish between healthy, living branches and dead branches that can be eliminated. Even with the more recent varieties that produce flowers on both new and old growth, keep in mind that the bulk of blooms develop on old wood.
- erroneous solar exposure Bigleaf hydrangeas favor early morning and afternoon shade or dappled sunlight. While too much midday sun may damage plants, too much shade will restrict blossom production.
- Insufficient moisture. For optimum growth, plants require well-drained soil with adequate moisture. Even if the leaves appear healthy, drought stress can have an influence on blooming and general plant health. There is such a thing as too much of a good thing, though, since over watering can also harm the health and flowering of plants.
- fertilizer application done in excess. Fertilizers high in nitrogen encourage deep green foliage but few flowers. Remember that occasionally this might be caused by fertilizer washing into the soil around the hydrangea from other parts of the yard. Higher phosphorus than nitrogen fertilizers promote bloom growth.
- Also bear in mind that it takes time for new plants to grow. Plants may not flower as much during establishment, which is typically regarded as the first growing season, as they are more focused on developing their roots and stems.
What’s the rate of growth of Hydrangea macrophylla?
Hydrangeas (Hydrangea spp.) are widespread attractive garden plants with a wide range of bloom colors, including white, numerous shades of blue and pink, maroon, red, and even pale green. There are dozens of species and even more variants of hydrangeas. Depending on the species, some hydrangeas have enormous, rounded flower heads, while others have smaller, flatter, and more delicate blossoms. Plant hydrangea shrubs in the fall or early spring to give them time to develop a strong root system. With an average annual growth of two feet or more, hydrangeas are quick-growing plants. Be aware that both humans and animals are poisoned by the plant.
Should you prune your macrophyllous hydrangeas?
Late summer to early fall (August to September) sees the development of these plants’ bloom buds for the next year. So, before August, prune these shrubs once they are finished blooming (again, make a heading cut).
The Endless Summer is an exception. The Original Bigleaf Hydrangea (H. macrophylla ‘Bailmer’ PP15,298) as well as many cultivars from Bailey Nurseries’ Endless Summer line, including Blushing Bride, BloomStruck, Summer Crush, and Twist ‘n’ Shout.
On the wood from last year and any new wood that sprouts this year, the H. macrophylla blooms. Therefore, whether you prune it or not, it will bloom. A big, 4-foot-tall ring of hardware cloth can keep rabbits from nibbling on the stems of H. macrophylla over the winter.
The pink to blue tint of the Endless Summer hydrangea’s flowers (achievable with the right soil amendment) plus the fact that it blooms on both old and new wood caused it to make a big splash on the Minnesota landscape plant scene.
How is macrophylla cared for?
Some Hydrangea macrophylla species bear their flower buds through the winter because they bloom on aged wood. Frost that arrives too early or too late can harm flower buds and keep them from blooming. For instance, only three out of five years may see bloom success in Zone 5, but the plant will still thrive there. Recent arrivals, which bloom on both new growth and stems that have been in the ground for a year, are fortunately likely to blossom for gardeners in milder climates.
Light/Watering: In the North, the majority of cultivars tolerate full sun, but they thrive from afternoon shade. Plants need afternoon shade in the South. Plants should not be grown in hot, dry, exposed locations; moist soils that do not dry out are desirable. Mulch helps to stabilize soil temperatures and preserve moisture.
pH of the soil, fertilizer, and soil: Use a fertilizer intended to promote blooming once in the spring (such as 15-30-15). The pH of the soil affects the color of the flowers in many H. macrophylla species; blooms in low pH (acid soils) will be blue, whereas flowers in higher pH will be pink. Deep, bright blues typically result from a pH below 5.0, however as the pH rises, blooms can range from blue to lavender to mauve to a vivid deep pink at pH 7.0. (neutral). Aluminum availability in the soil is dependent on pH; in acidic soils, aluminum is more easily obtainable, which contributes to the blue hue of the flowers. Using a fertilizer low in phosphorus will help you grow blue blooms because this nutrient binds up aluminum in soils. If you want pink flowers but your soil is acidic, all you have to do is add lime to boost the pH and use a balanced fertilizer. If you want blue flowers, aluminum sulfate will cause the pH to decrease.
To learn more about soil testing in your area, we advise you to contact your cooperative extension service. For a list of organizations taking part in the Cooperative Extension program, see this page.
Additionally, we supply a Soil pH Meter that enables you to test your soil and yields prompt, precise results.
How late may hydrangeas be planted?
When may I put a hydrangea in a planter outside? Anytime of the year is suitable for planting a potted hydrangea in the ground. The ideal seasons are, however, spring or autumn. Plant either in early fall when the soil will still be warm and before the frosts or after the spring frosts have passed.
Where should hydrangeas be planted for greatest results?
Plant hydrangeas close to a water source in an area with lots of light. Choose a location in the South where there is morning sun and afternoon shade. Hydrangeas can tolerate full-day sun in the north.
What qualities should a hydrangea have?
Although Hydrangea aspera, sometimes known as rough-leaved hydrangea, does not hang out with the hydrangea in-crowd of species that are frequently planted in the United States, it has its own unique attractiveness. This deciduous beauty has fuzzy hair-covered leaves and adds winter interest with its peeling, dark bark. Rough-leaved hydrangea is an upright shrub that reaches a height of 6 feet in USDA plant hardiness zones 6 through 10. To acquire the desired flower color and foliage, choose your cultivar before looking for the plant.
Make sure the hydrangea’s leaves are healthy, vibrant green, and perky. A plant with wilting leaves should be rejected unless it promptly bounces back after watering. Wilting leaves can indicate Armillaria root rot that can kill the hydrangea and also infect other shrubs in the garden.
Gently flip each hairy leaf over and inspect it for spots or discolouration. Avoid purchasing plants if they have purple splotches on their powdery leaves, as this is a sign of powdery mildew. Fungal leaf spot infections are indicated by dark lesions on the leaves. Rust is shown by red dots on the underside.
Look for twisted development in the plant’s new branches, which is a symptom of a mite infection. Verify for spider mites by keeping an eye out for webbing between the leaves. Any plant with a mite infestation should be rejected because it is difficult to get rid of.
Ants are typically drawn to the rough-leaved hydrangea by an aphid infestation, so look for them on every surface of the plant. If you do notice ants, search the undersides of the leaves for little green insects.
By leaning the plant to one side and squeezing the planting pot, the entire root ball can be extracted from the plant container. Look for roots that have wrapped around the inside of the container in the dirt at the bottom and sides of the root ball. Avoid purchasing root-bound plants because they lack sufficient soil and nutrition.