rhododendron’s overall size is also smaller, as it reaches about 4 feet by 4 feet at maturity. While all Azaleas are Rhododendrons, all Rhododendrons are not Azaleas. But for those curious about what distinguishes… Pee Gee Hydrangea and Limelight Hydrangea Pee Gee has a bigger size. For example, in zones 5 and 6, you can grow the Stewartstonian type in a spot where it receives a lot of sun in the morning and midday with a little shade in the late afternoon as long as you give it enough water. It is an evergreen suited to zones 5 to 8. It is usually better to be conservative about applying fertilizer so that you do not risk burning your plants. Rhododendrons (Rhododendron spp.) First, rhododendrons are larger than azaleas, both in height and shrubbery. Classified into the same genus, Rhododendron, and with very similar flowering and growing habits, it's easy to say that it was some sort of confusion between common name and … You do not want the tree to be in competition with your azaleas or rhododendrons. Unlike Stewartstonian and Blaauw's Pink azaleas, the next three examples of azaleas are deciduous shrubs: Planting azaleas and rhododendrons in a spot cooled by at least a bit of shade is a step in the right direction in their proper care. They are approximately 4"-6" long and 3"-5" wide, but in some cases, they may grow even larger. Miracle-Gro® Water Soluble Miracid® Acid-Loving Plant Food is great for use on Azaleas, Camellias, Gardenias, Hibiscus, Holly, Hydrangeas, Orchids, and many others. It is best to plant Azaleas, Camellias, Rhododendrons, and Hydrangeas in a shady location. When you apply the fertilizer in late fall, only use half of the recommended dosage. The foliage on these hydrangeas also changes color in the fall and are the only type of hydrangeas that do that. By: ... Rhododendron blossoms are larger, with obvious five-petal lobes. Difference Between Mountain Laurel & Rhododendrons. These are the most popular bigleaf hydrangea. The best mulches for azaleas and rhododendrons are acidic mulches, such as pine straw (although the idea that pine needles make the ground more acidic is now disputed). On average, rhododendrons are larger shrubs than azalea plants, and they have larger leaves. Small mountain laurel flower buds look crimped, while rhododendron buds are … Marie Answer. These are the least common bigleaf hydrangea. Here is a quick rundown on the primary qualities of each. Most bloom in the spring, but some varieties in mid summer and the fall. wide (7 cm), is elegantly frilled and flushed red orange with a gold tinge. 1) What is the difference in composition between a good fertilizer for rhodos and azaleas versus one for hydrangeas? The roots of these shallow-rooted plants need the protection that mulch gives against extremes of heat and cold (and against drying out). The flowers of French hydrangea will vary depending on the pH of the soil in which the shrub is growing. When rhododendrons turn yellow between leaf veins it is generally a sign of low pH in the soil. Do not apply fertilizer at planting time. New foliage and roots are not yet ready to handle the high salt content of fertilizer, and they can be burned by the fertilizer. This will promote a more attractive, compact shape. Some people ammend their hydrangeas' soil with aluminum sulphate to make their non-white plants' florets blue. Most are shrubs 1 to 3 meters tall, but some are small trees, and others lianas reaching up to 30 m (98 ft) by climbing up trees. Some PJM varieties grow up to 6 feet tall, while others have a lower, more spreading habit. Blooms may be the tradition pinks, purples and whites, but also include yellows and dark red varieties. These are the most popular bigleaf hydrangea. Click through on each type for more detailed information. Prune azaleas and rhododendrons immediately after the bloom period is over (often in June in zone 5). Lastly, these plants have leaves which vary in size from each other. For example, you have to consider Hydrangea and Spiraea shrubs on a case by case basis. Azaleas are in the genus Rhododendron. These are sometimes planted as hedges because of their size. Each flower consists of 4 narrow, crinkled, strap-shaped petals with red-p… If you’re looking at a shrub that is well over 6 feet (1.8 m.) tall, it is a viburnum. The leaves of PG hydrangeas are relatively easy to identify when compared with other hydrangeas. How's that for an answer! ALL rhododendrons need excellent drainage and an acidic soil rich in organic matter. Growing rhododendrons . Most of them used to be large specimens between 8-10' but there have been quite a lot of recent introductions of compact paniculatas. Light: Rhododendrons, azaleas and camellias all prefer three–four hours of direct sunlight in order to grow densely and bloom reliably. In addition, rhododendron flowers have ten stamens, while azaleas have five stamens. So if you read the botanical name of a common azalea on a plant label at the nursery, you will likely see the word, "Rhododendron.". Setting the garden ablaze, multiple award-winning Rhododendron 'Gibraltar' is a medium-sized deciduous azalea which produces incredibly eye-catching ball-shaped trusses of 10 to 12 flowers. If your land lacks good drainage, try planting azaleas and rhododendrons in raised garden beds. Landscaping enthusiasts seem content to group all the varieties together -- both in their vocabulary and in their yards -- as long as they get to enjoy the beautiful pictures these long-time gardening favorites paint on their landscapes! I don't understand the proper difference josusa. The shrub is best-suited to partial shade. More telling is that azaleas will have one-stem flowers while rhododendrons have them in trusses or clumps of flowers not dissimilar to hydrangeas that look like balls of flowers. The Difference Between Wild Oakleaf Hydrangea & Alice? Fertilizing rhododendron bushes isn’t necessary if the shrubs are planted in fertile soil. With near 1,000 species available, Rhododendrons offer a wide variety of choices, with something to suit almost any climate. Rhododendrons are almost always evergreen with only a few exceptions. Since 1945, PJM rhododendrons have been used for mass plantings in the garden, as foundation plants and as specimens. Step 3 …and what you do want. Blaauw's Pink azalea (Rhododendron Blaauw's Pink) has salmon-pink flowers. The final separation is that many azaleas are deciduous. Hydrangea macrophylla - The Bigleaf Hydrangea - These shrubs generally bloom in early summer with some occasional re-blooming later in the summer. Then prune back tall, gangling limbs shooting out of the top of the bush. Annuals and Perennials: The Lifespan. Lacecaps are identical to mopheads in every way except the shape of their blooms. Well, you must have heard of the names azaleas and rhododendrons? Lower surface of the leaves is coated with a dense furry layer of hairs known as the indumentum, adding welcome color and interest in the nonblooming season. They should be planted in raised beds of about 8-10 inches of good garden soil. Amend the soil with compost. Oct 28, 2016 - At first glance, rhododendrons and azaleas seem to be nearly the same plant. When choosing rhododendron and azalea companion plants, look for those that can tolerate a pH between 4.5 and 6. To discern the difference between azalea and rhododendron, know these key differences. A north or east side of a house, and/or under a tree with filtered shade is good. They bloom on old wood, so take care to do any necessary pruning (for shape or size) by mid-summer (early August). Most rhododendrons are not. PG hydrangeas are the only hydrangeas that will form trees. If your soil has naturally occuring trace elements of aluminum, the quantities should be small and not cause problems for azaleas. Listed for USDA planting zones 4 to 8, these plants are native to the southern part of the Appalachians. Hybrid rhododendrons are those which have been bred as a cross between different varieties to produce more spectacular flowers. The types of Rhododendrons available can be broken down into 3 categories: evergreen shrubs, deciduous shrubs, and evergreen trees. Number of Stamen – these are the little twig-like pollen-filled stems found inside the flowers. They have a matte surface and a courser texture than the smooth leaf of the mophead. Difference Between Mountain Laurel & Rhododendrons. Both prefer well drained soils with an acidic pH between 5 and 5.5. P.J.M. There are great varieties of both of these spectacular flowering bushes, equally useful as specimens and in hedges. Snowball bushes growing in colder climates are probably hydrangeas. Azaleas and rhododendrons are not desert plants; they like water. This rhododendron shrub is easy to transplant, but it does prefer a shady location. Rhododendrons are a highly popular plant, thanks to their ability to bloom abundantly with a large array of different flowers. Both prefer well drained soils with an acidic pH between 5 and 5.5. Hydrangeas definitely do best in dappled shade and can cope in neutral soil. Additionally, both of these shrubs prefer filtered light or afternoon shade. All azaleas belong to the Rhododendron genus, but not all Rhododendrons are azaleas. To distinguish between the two plants, look first at the leaves. In addition, rhododendron flowers have ten stamens, while azaleas have five stamens. Introducing "One Thing": A New Video Series. There are 5 main types of hydrangeas that you will find in North America. What are the differences in hydrangeas? Hydrangea (/ h aɪ ˈ d r eɪ n dʒ i ə /) common names hydrangea or hortensia, is a genus of 70–75 species of flowering plants native to Asia and the Americas. They like to be set high on a mound so the drain well. That's a great question that has an answer with a "twist". The leaves of this bush are evergreen. Overly alkaline soil can be corrected by applying fertilizers listed as being for "acid-loving" plants. So how do you tell an azalea apart from other rhododendrons? I have never fertilized my hydrangeas, but have some fertilizer (pellet form) that I bought specifically for the rhodos and azaleas. The stamens of a flower are those thin stems sticking out (they are male flower parts and produce pollen). Most rhododendrons are not. Large petals complement the beauty of flowers. These are the most cold hardy hydrangea and can grow from zones 3 to 7. Rhododendrons will not do well in wet soil around their roots. Same thing with Rhododendrons, Azaleas, and … ). Hydrangeas, however, are less sensitive and will tolerate soils with a higher pH. Many people get these two plants confused. Red oak is a fast grower, eventually reaching a height of 60 to 75 feet with a spread of 40 to 50 feet. They are root hardy and should not have issues blooming. Another notable difference is the smaller stems and branches when compared to Rhododendrons. When you have naturally acidic soil in your yard, it is a lot easier simply to grow acid-loving plants rather than trying to change the pH level. Azaleas are part of the genus Rhododendron but they are different enough from other species within the genus to divided into a sub-grouping. pH had little to do with it. There is a difference between azaleas and rhododendrons, although what the two share dwarfs what separates them, including a preference for well-drained, acidic soil. Hydrangea macrophyllaHydrangea serrata - a smaller bush than H. macrophylla with smaller leaves and flowers. Difference between Rhododendrons and Azaleas. It is also another good selection for foundation plantings since it remains a relatively compact plant. Be careful not to overfertilize. P.J.M. 10 Types of Azaleas for the Flower Garden, These Street Trees Can Withstand Road Pollution, 29 Shrubs That Grow in Full or Partial Shade, 15 Recommended Flowering Shrubs for Your Home, 15 Red-Flowering Plants to Consider for Your Garden, Weeping Cherry Trees and Other Cascading Trees. PJM stands for Peter J. Mezitt, who, along with his father, developed the rhododendron hybrids that carry those initials. Stems often have tiny black or red streaks or speckles. One feature that will aid in identification of the H. paniculta is this: three leaves grow from a stem-node and are distributed around the node in a whorl. Learn about some of the best choices and how to grow them. There are 3 different types of hydrangea macrophylla; mophead, lacecap and mountain hydrangeas. Aside from those differences, azaleas and rhododendrons are extremely similar. Its size is about 5 feet by 5 feet. Also called Hydrangea petiolaris, these can grow 30 to 80 feet long. The leaves of arborescens are generally heart shaped, thin, and floppier than the mopheads (macrophylla). Noted for its abundant flowering, the quality of its foliage and its pleasant fall colors, Hamamelis x intermedia 'Pallida' is one of the most popular hybrid witch hazels and one of the finest winter-flowering shrubs. Follow the instructions on the fertilizer's label, except for the amount of fertilizer to apply. There are 3 different types of hydrangea macrophylla; mophead, lacecap and mountain hydrangeas. It is a good choice for foundation plantings and large rock gardens. Another difference is the curling direction for the edges of the leaves. Keep in mind that there are also members of this genus that are just plain "rhododendrons." Let me explain. If garden soil is poor, or you use certain types of mulch that deplete nitrogen in the soil, feeding rhododendrons is one way to provide the plants with nutrients. Climbing hydrangeas are native to Asia (Japan, Korea and Siberia) and can grow in zones 4 to 8 and are becoming more popular due to the uniqueness of growing up structures and having large blooms. An annual plant lives its entire lifespan in a single growing season. Exposure for all of the varieties below is full sun to part shade. For some people, these two terms may come as one and the same, but for the other half, these two plant … Hydrangeas, however, are less sensitive and will tolerate soils with a higher pH. An important difference between the potted variety of hydrangea (usually bought at a florist as a foil-wrapped bunch of hydrangeas) is that both foil-wrapped and pre-potted hydrangea that are bought at the store are often grown in greenhouses to speed up the flowering process. In general, mophead and lacecap leaves are relatively thick and crisp, somewhat shiny, and often heart-shaped. However, they bloom earlier; their … These are also called wild hydrangeas, these shrubs are native to the United States. Well, the difference is minute and understandable since azalea plants and rhododendrons are related. Though, according to online plant retailer and information source Plant Addicts Inc. , its blooms are most forgiving, still managing to put on … Cut that in half. They are medium green with a matt finish. Mountain laurels and rhododendrons belong to the heath family, Ericaceae. Azaleas vs. Rhododendrons. A few shade trees are compatible with azaleas and rhododendrons, most notably the red oak (Quercus rubra). The flowers of P.J.M. The edges are finely toothed in some varieties and more coursely toothed in others. It can be used for any acid-loving plants, such as blueberries, camellias, rhododendrons, evergreens, hydrangeas and more. Like traditional rhododendrons they have large leaves and large flowers held in trusses, some of which are scented, making them ideal as flowering hedge or … What they really prefer is a high Magnesium soil. I do know that all azaleas are part of the rhododendron family. Hydrangea (/ h aɪ ˈ d r eɪ n dʒ i ə /) common names hydrangea or hortensia, is a genus of 70–75 species of flowering plants native to Asia and the Americas. In general, mophead and lacecap leaves are relatively thick and crisp, somewhat shiny, and often heart-shaped. Hydrangeas, however, are less sensitive and will tolerate soils with a higher pH. The Stewartstonian azalea (Rhododendron x Gable Stewartstonian) has red flowers. Soil pH should be about 5.5; have your garden soil tested first before planting azaleas and rhododendrons. Variable species native over a wide area of Japan, with different forms occurring on virtually every mountain range in the southern half of the island chain. So if you prune your hydrangea too severely late in the season you are likely to cut off many if not all of the flower buds for next year. You can't say that all hydrangeas flower on new wood or that all spireas bloom on old growth. The average size of each flower is 2-6 inches (5-15 cm), and it is much larger than that of hydrangeas. Learn tips for creating your most beautiful (and bountiful) garden ever. Jul 15, 2017 - Azaleas and rhododendrons are closely related but different types of plants. This shrub typically produces 1 to 3 flowers per stem and each bloom can host 5 to 6 stamen. Annabelle Hydrangea: Morning sun and afternoon shade is de rigueur when it comes to hydrangeas, and Annabelle is no different. You will want to fertilize your plants twice a year – In early spring and late fall. Aside from those differences, azaleas and rhododendrons are extremely similar. 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