It is easy to see where the Oakleaf Hydrangea gets its name. I have never fertilized my hydrangeas, but have some fertilizer (pellet form) that I bought specifically for the rhodos and azaleas. Difference Between Mountain Laurel & Rhododendrons. Sizes range from prostrate forms with pinhead leaves to tree-sized. 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. Hydrangeas, however, are less sensitive and will tolerate soils with a higher pH. What they really prefer is a high Magnesium soil. 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 … Lastly, these plants have leaves which vary in size from each other. Be aware, there is no scientific basis to my thoughts, it's just how I personally differentiate between … Miracle-Gro® Water Soluble Miracid® Acid-Loving Plant Food is great for use on Azaleas, Camellias, Gardenias, Hibiscus, Holly, Hydrangeas, Orchids, and many others. The leaves of this bush are evergreen. Learn the difference, and seven types to consider for your garden. The scientific name for lacecap hydrangeas is Hydrangea macrophylla normalis. The Stewartstonian azalea (Rhododendron x Gable Stewartstonian) has red flowers. Order Hydrangea Size, Color & Bloom Comparison 34"x24" Poster or Download PDF. Some PJM varieties grow up to 6 feet tall, while others have a lower, more spreading habit. Most of the rhododendrons people grow are hybrids, rather than natural species. Another difference is the curling direction for the edges of the leaves. Small mountain laurel flower buds look crimped, while rhododendron buds are … Hydrangea macrophyllaHydrangea serrata - a smaller bush than H. macrophylla with smaller leaves and flowers. Slightly fragrant, they blanket this midseason Knaphill hybrid in an exc… Some people ammend their hydrangeas' soil with aluminum sulphate to make their non-white plants' florets blue. In addition, rhododendron flowers have ten stamens, while azaleas have five stamens. We do carry several lawn and plant fertilizers here that would better suit those depending on your needs. The plant tissues contain chemical toxins that can cause stomach pain or death if eaten in large amounts. Azaleas, Camellias, Rhododendrons, Gardenias, & Hydrangeas Care Guide Light & Watering Requirements. pH had little to do with it. Difference between Rhododendrons and Azaleas. Azaleas and rhododendrons like well-drained soil, not dry soil. Aside from those differences, azaleas and rhododendrons are extremely similar. Azalea Requirements Stunning in woodland gardens and shrub borders, rhododendrons and azaleas (Rhododendron spp.) The leaf stems (petiole) are long and hold the leaf away from the main stem. These are large blooms typically start white and may turn to pink. To distinguish between the two plants, look first at the leaves. Difference Between IHRM and Domestic HRM - November 22, 2011 Difference Between Heifer and Cow - November 22, 2011 Difference Between Deacons and Elders - November 22, 2011 Exposure for all of the varieties below is full sun to part shade. The genus of Rhododendron is in the heath family, which also includes its namesakes, the heathers (Calluna vulgaris), Andromeda (Pieris japonica), and mountain laurels (Kalmia latifolia). These are the most cold hardy hydrangea and can grow from zones 3 to 7. They have a matte surface and a courser texture than the smooth leaf of the mophead. ; A snowball viburnum bush won’t tolerate a climate colder than U.S. Department of Agriculture plant hardiness zone 6. In general, mophead and lacecap leaves are relatively thick and crisp, somewhat shiny, and often heart-shaped. Grow it in zones 4 to 8. ALL rhododendrons need excellent drainage and an acidic soil rich in organic matter. This will promote a more attractive, compact shape. Also, there is an easy guide at the bottom of this article to quickly read through the information. The leaves of PG hydrangeas are relatively easy to identify when compared with other hydrangeas. Keep in mind that there are also members of this genus that are just plain "rhododendrons." The main difference with some exceptions, which can be argued, is that azaleas tend to be deciduous with funnel shaped flowers and rhododendrons tend to be evergreen and bell-shaped flowers. Rhododendrons (common name) are those that remain evergreen into the winter with bell-shaped flowers. Since 1945, PJM rhododendrons have been used for mass plantings in the garden, as foundation plants and as specimens. This shrub typically produces 1 to 3 flowers per stem and each bloom can host 5 to 6 stamen. serrata. Both prefer well drained soils with an acidic pH between 5 and 5.5. Red oak is a fast grower, eventually reaching a height of 60 to 75 feet with a spread of 40 to 50 feet. Download the PDF for … Stems often have tiny black or red streaks or speckles. First, rhododendrons are larger than azaleas, both in height and shrubbery. That's a great question that has an answer with a "twist". 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. It germinates, sprouts, blooms, and produces seeds before it dies in autumn. Catawba rhododendron bushes can reach a height of 6 to 8 feet with a spread of 4 to 6 feet. Also called French hydrangeas, florist's hydrangeas, & hortensia. Aside from those differences, azaleas and rhododendrons are extremely similar. Pee Gee is bigger than Limelight. This tree is also a pollution-tolerant tree, an important factor in urban and suburban landscaping. Same thing with Rhododendrons, Azaleas, and … When choosing rhododendron and azalea companion plants, look for those that can tolerate a pH between 4.5 and 6. Cut that in half. If your soil has naturally occuring trace elements of aluminum, the quantities should be small and not cause problems for azaleas. Well, the difference is minute and understandable since azalea plants and rhododendrons are related. Within the rhododendrons, themselves, leaf-size comparisons are used to make a further division between large-leaf and small-leaf types. Read on to learn how to fertilize rhododendrons. Gardenias and deciduous … Click through on each type for more detailed information. Oakleaf hydrangeas are similar to paniculatas (old specimens were tall but new introductions are compact). Snowball bushes growing in colder climates are probably hydrangeas. There are great varieties of both of these spectacular flowering bushes, equally useful as specimens and in hedges. All azaleas belong to the Rhododendron genus, but not all Rhododendrons are azaleas. Difference Between Rhododendron & Azalea. Jul 15, 2017 - Azaleas and rhododendrons are closely related but different types of plants. The plants do not like to be sitting in it for long periods of time, which would cause their roots to rot. Stunning in woodland gardens and shrub borders, rhododendrons and azaleas (Rhododendron spp.) The little buds in the center of the lacecap are the fertile flowers, and the large showy blossoms around the outer edge are the sterile flowers. Rhododendrons are almost always evergreen with only a few exceptions. Hardy, this medium to large, vase-shaped, deciduous shrub enjoys dense clusters of fragrant, frost-proof, bright sulphur-yellow flowers in mid- to late winter. Azaleas vs. Rhododendrons. Azaleas are really rhododendrons. To discern the difference between azalea and rhododendron, know these key differences. Get the latest updates on new products and upcoming sales, Panicle hydrangeas | Hydrangea paniculata, Smooth Hydrangeas | Hydrangea arborescens, Oakleaf Hydrangeas | Hydrangea quercifolia, Climbing Hydrangeas | Hydrangea petiolaris. are available with either pinkish-lavender or white flowers. However, there are examples when these hydrangeas reached a height of 20 or even 25 feet. It is best to plant Azaleas, Camellias, Rhododendrons, and Hydrangeas in a shady location. To distinguish between the two plants, look first at the leaves. Ever wondered what the difference is between azaleas and rhododendrons? 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. ). The leaves on azalea plants tend to be smaller by comparison. ), making it difficult to generalize about the best pruning time. 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 tips for creating your most beautiful (and bountiful) garden ever. The leaves of arborescens are generally heart shaped, thin, and floppier than the mopheads (macrophylla). Mountain laurel (Kalmia latifolia) naturally grows only in the eastern United States' forests. Both rhododendrons and hydrangeas are sensitive to soil pH, and both grow best in acidic soils with a pH level between 5 and 5.5. The final separation is that many azaleas are deciduous. 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. Rhododendrons, for instance, are supposed to require an acid soil. It is also another good selection for foundation plantings since it remains a relatively compact plant. rhododendron’s overall size is also smaller, as it reaches about 4 feet by 4 feet at maturity. Azaleas, in contrast, are deciduous - losing their leaves in the winter - with funnel shaped flowers. Oct 28, 2016 - At first glance, rhododendrons and azaleas seem to be nearly the same plant. 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! How to tell the difference between azaleas and rhododendrons? After ten years of growing, it reaches about 10 feet in height, with a width of 8 feet. Amend the soil with compost. The color will change from orange to red to mahogany. A few shade trees are compatible with azaleas and rhododendrons, most notably the red oak (Quercus rubra). Rhododendrons will not do well in wet soil around their roots. 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. Hydrangeas definitely do best in dappled shade and can cope in neutral soil. Since azaleas and rhododendrons prefer some shade, choose a compatible shade tree to grow nearby. They are root hardy and should not have issues blooming. Meanwhile, Rhododendron’s leaf edges curl downward. Rhododendrons are grown primarily for their colorful flowers. Composts for growing young plants are the kind most people will be after. 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. Be careful not to overfertilize. The botanical name for those is Schizophragma hydrangeoides and this plant is native to Japan. Rhododendrons are almost always evergreen with only a few exceptions. Mountain laurel (Kalmia latifolia) naturally grows only in the eastern United States' forests. Most members of the heath family require acidic soil. Despite being known as shrubs that grow in shade (dappled shade, preferably), some varieties tolerate (or even prefer) full sun if given enough water. Difference Between Mountain Laurel & Rhododendrons. You will want to fertilize your plants twice a year – In early spring and late fall. These plants are often found growing side-by-side in wooded, mountainous areas throughout the … It can be used for any acid-loving plants, such as blueberries, camellias, rhododendrons, evergreens, hydrangeas and more. Most rhododendrons are not. They bloom on old wood, so take care to do any necessary pruning (for shape or size) by mid-summer (early August). Panicle hydrangeas are known for their cone shaped flower heads. So how do you tell an azalea apart from other rhododendrons? Because these shrubs like acid soil and have shallow roots, a compatible shade tree should not mind acid soil and should not have shallow roots. These are easy to spot because they are actually vines. I do know that all azaleas are part of the rhododendron family. They need filtered/dappled sun or morning sun only. The scientific name for mountain hydrangeas is Hydrangea macrophylla ssp. The Rhododendron genus is large and complex with over 900 species. Hydrangeas, however, are less sensitive and will tolerate soils with a higher pH. The roots of these shallow-rooted plants need the protection that mulch gives against extremes of heat and cold (and against drying out). Their central stem(s) can be developed into very attractive trunks. Lacecaps are identical to mopheads in every way except the shape of their blooms. When you apply the fertilizer in late fall, only use half of the recommended dosage. Well, you must have heard of the names azaleas and rhododendrons? Also, azalea flowers usually have five stamens, while the rhododendron flowers have ten. The final separation is that many azaleas are deciduous. A good time to fertilize azaleas and rhododendrons is right after the plants have finished blooming. Leaf stems (petiole) are short, causing the leaves to hug close to the main stems in most cases. These are the least common bigleaf hydrangea. P.J.M. David Beaulieu is a garden writer with nearly 20 years experience writing about landscaping and over 10 years experience working in nurseries. Rhododendrons and azaleas can often be found growing under the canopy of oaks or in the shade of pine. 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. There are 5 main types of hydrangeas that you will find in North America. Roughly 28,000 different cultivars exist today -- … These are also called wild hydrangeas, these shrubs are native to the United States. The gardener finds a similar situation with roses ( Rosa spp . Many recognize these due to their large flower heads that are purple, blue and pink. Apply an organic mulch to protect its shallow roots from water loss and extremes in soil temperature. Step 3 …and what you do want. It's leaves are shaped much like those of a red oak. A north or east side of a house, and/or under a tree with filtered shade is good. They are approximately 4"-6" long and 3"-5" wide, but in some cases, they may grow even larger. Rhododendrons are a highly popular plant, thanks to their ability to bloom abundantly with a large array of different flowers. Here is a quick rundown on the primary qualities of each. Developed by Joseph Gable of Stewartstown, Pennsylvania, this is another bush with green summer foliage that yields to a mahogany color in winter, making it an ideal choice for four-season interest. Hydrangeas can fall victim to bacterial wilt, root rot, bud or flower blights, or leaf spots. The flowers of P.J.M. It becomes a maximum of 5 feet high and 6 feet wide. Both grow best in moist, well-drained, organic-rich soils with an acidic pH. Begin by pruning off dead or injured branches, which could cause disease and insect problems in the future. Light: Rhododendrons, azaleas and camellias all prefer three–four hours of direct sunlight in order to grow densely and bloom reliably. If they are not grown in soil with proper acidity, the plants can exhibit symptoms of iron deficiency, which causes the breakdown of green between … These are sometimes planted as hedges because of their size. There are 3 different types of hydrangea macrophylla; mophead, lacecap and mountain hydrangeas. Snowball hydrangea shrubs grow 4 to 6 feet (1.2 to 1.8 m.) tall, while the viburnums grow 6 to 10 feet (1.8 to 3 m.) tall. Marie Answer. Experimenters in Scotland raised the pH of soil from 5.0 to nearly 8.0 with Magnesium Carbonate, and the rhodies grew better and better as the soil pH went up because the Magnesium level was going up. Only morning sun is recommended because afternoon sun causes burning on the leaves. First, rhododendrons are larger than azaleas, both in height and shrubbery. PG hydrangeas are the only hydrangeas that will form trees. Though, according to online plant retailer and information source Plant Addicts Inc. , its blooms are most forgiving, still managing to put on … The shrub is best-suited to partial shade. are similar shrubs … The leaves of PG hydrangeas are relatively easy to identify when compared with other hydrangeas. Azaleas are part of the genus Rhododendron but they are different enough from other species within the genus to divided into a sub-grouping. Their edges are coarsely toothed. It grows best in part shade. 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). include about 1,000 different species native to various habitats across the Northern Hemisphere. But aluminum is toxic to azaleas and rhododendrons so do not use a/s around them. By far the greatest species diversity is in eastern Asia, notably Korea, China, and Japan. Then prune back tall, gangling limbs shooting out of the top of the bush. If you would like improve the blue color of your hydrangeas or change them to blue, then we recommend you apply the Master Nursery Hydra Blue three times between November & May. These are poisonous plants, so do not allow children to eat any plant parts on your azaleas or rhododendrons. Rhododendron species as found in the wild grow, flower, are pollinated, and set seed.The seedlings are usually pollinated by the plants of the same species and generally look similar to the parent plants, though there may be small, and sometimes considerable, variations among them. For some people, these two terms may come as one and the same, but for the other half, these two plant … It is also one of the most widely grown. Also called Hydrangea petiolaris, these can grow 30 to 80 feet long. The thing to remember is all azaleas are rhododendrons but not all rhododendrons are Azaleas. Bigleaf Hydrangeas are basically broken into 2 categories, Hydrangea macrophylla and Hydrangea serrata. Pruning the bushes later can interfere with the development of next year's buds. There are standard fertilizers to use on azalea and rhododendrons bushes, mixes that can be purchased at nurseries and major hardware chains. In general, mophead and lacecap leaves are relatively thick and crisp, somewhat shiny, and often heart-shaped. This evergreen can be grown in zones 6 to 9. 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. The leaves are typically thin and smooth with fuzzy undersides. These are large blooms typically start white and may turn to pink. 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