Smooth hydrangeas and Bigleaf hydrangeas are not the same. While they both belong to the Hydrangea genus, they are different species and have distinct characteristics. In terms of growth habit and foliage, there are noticeable differences between the two.
Smooth hydrangeas, scientifically known as Hydrangea arborescens, have a more rounded growth habit compared to Bigleaf hydrangeas (Hydrangea macrophylla). The branches of smooth hydrangeas tend to arch outwards, creating a more open and spreading form. On the other hand, Bigleaf hydrangeas have a more compact and bushy growth habit, with branches growing more upright.
When it comes to foliage, the leaves of smooth hydrangeas are typically slightly heart-shaped and have a matte or dull surface. These leaves are relatively smaller compared to Bigleaf hydrangeas, measuring around 3-6 inches in length. In contrast, Bigleaf hydrangeas have larger leaves, usually ranging from 4-8 inches in length. The leaves of Bigleaf hydrangeas are elliptical in shape and have a waxy texture. They are also serrated or toothed along the edges.
Another distinguishing feature between smooth hydrangeas and Bigleaf hydrangeas is their flower clusters. Smooth hydrangeas produce large, rounded flower clusters known as corymbs. These corymbs consist of numerous small, fertile flowers surrounded by larger, sterile flowers that give the cluster a showy appearance. The color of the flowers can range from white to creamy white or even pale green.
In contrast, Bigleaf hydrangeas produce large, globe-shaped flower clusters called mopheads or lacecaps, depending on the cultivar. Mophead hydrangeas have dense clusters of large, sterile flowers that form a ball-like shape. Lacecap hydrangeas have a flatter cluster with a ring of large, showy sterile flowers surrounding a center of small fertile flowers. The colors of the flowers in Bigleaf hydrangeas vary greatly, including shades of pink, blue, purple, and white, depending on the soil pH and availability of aluminum ions.
In terms of cultivation, smooth hydrangeas are generally more cold-hardy and can tolerate harsh winters better than Bigleaf hydrangeas. Smooth hydrangeas also have a higher tolerance for full sun, while Bigleaf hydrangeas prefer partial shade. However, both species require regular watering and well-draining soil to thrive.
In my personal experience, I have grown both smooth hydrangeas and Bigleaf hydrangeas in my garden. The smooth hydrangeas provided a beautiful display of white flowers in mid-summer, and the rounded growth habit added a nice touch to the landscape. On the other hand, the Bigleaf hydrangeas had larger flowers with vibrant colors, which added a splash of beauty to shady areas of my garden. It is important to note that the care and maintenance requirements may vary slightly for each species, so it’s essential to research and provide the appropriate conditions for each type of hydrangea.
To summarize, smooth hydrangeas and Bigleaf hydrangeas are not the same. They have distinct growth habits, foliage characteristics, flower clusters, and cultivation preferences. Understanding these differences can help in correctly identifying and caring for these beautiful flowering plants in your garden.
