Most large-leafed varieties require dappled shade; avoid deep shade or full sun. A sunny spot that receives a few hours of shade is perfect. See regional guidelines below. Soil should be well-drained, humus-rich, moist, and acidic (pH 4.5–6).
Fortunately, the local deer don't like most rhododendrons, although they do like azaleas and evergreen azaleas, in particular, are akin to deer candy. Ferns seem to be generally deer resistant as do hellebores of all types.
Rhododendrons and azaleas ideally grow in damp, never soggy soil. Think of taking a wet sponge and squeezing it. The remaining damp sponge is the nearly perfect air and water environment for rhododendron roots. Too much water promotes root rot that can cause plant death.
Dig a hole as deep as the root ball and 2 times as wide. Set new plants so that their top roots are at soil level or slightly below. If you plant them any deeper, the roots may rot. Fill the hole half full with Read more
The majority of rhododendrons fall between about 3 to 6 feet in height. They can be planted by themselves but are also attractive when planted in groups.
Over 1000 species of rhododendrons/azaleas exist. All parts of the plant are considered poisonous, and as little as ingestion of 0.2% of an individual's body weight can result in poisoning.
Powdery mildew on rhododendrons is a fungal infection of the leaves. On rhododendrons, the disease often fails to develop the distinctive powdery white growth normally associated with powdery mildews. Do not over-water or over-fertilize plants, as the fungus favors succulent new growth.
Although rhododendron seeds fall to the ground, it is not common for them to germinate on their own because the garden environment is usually not ideal. Instead, you can gather your own seeds at the end of the growing season.
Rhododendrons grow best in soils with a pH of 4.5-6.0.
With their shallow roots, rhododendrons can grow well in pots. A container 20 inches tall and 20 inches across could hold a 2-gallon rhododendron and some shade perennials such as epimendium around the edge. During their first season, rhododendrons can stay right in the nursery Read more
The Azalea (Rhododendron simsii). What is this? Azalea is a beautiful flowering shrub which does well in cool areas and needs sunlight to survive. A good spot for it would be in the basement if you have windows there. It purifies the air from formaldehyde Read more
Rhododendron is one of the naturally occurring plants which possess various health benefits, such as prevention and treatment of diseases associated with heart, dysentery, diarrhea, detoxification, inflammation, fever, constipation, bronchitis and asthma . The leaves possess effective antioxidant activity.
Yes. Deadheading,or removing old spent flowers, is beneficial for lots of plants including rhododendrons and azaleas. Remove spent flowers by snapping off or cutting away the flower head. Do so as soon as they are finished blooming.
How should you fertilize Rhododendrons and Azaleas? These broad leaf evergreens are laid back and like to take it slow and easy. Do not fertilize them with quick release nitrogen fertilizers, it could kill them. Instead give them an organic snack, like Millorganite or well Read more
Rhododendrons (Rhododendron spp.) are acid-loving shrubs with big, bold flowers. Fairly tough once established in acidic soil, rhododendrons are regularly bothered by aphids, scale and whiteflies, honeydew-producing insects that attract ants in droves.
Believe it or not, Rhododendrons and Azaleas are quite easy to grow and it only takes a few things to make them happy. There's a fundamental secret about growing Rhododendrons in your yard or your landscape that cannot be overlooked and it cannot be stated Read more
Drainage: More rhododendrons are killed by waterlogging and poor drainage than any other cause. If the soil is boggy, heavy clay or compacted, rhododendrons will not grow for long and will likely die. Dark brown dead roots= Phytophthora caused by poor drainage. (NOT the same Read more
While it may be ugly, this common rhododendron disease is more superficial than serious. The fungus Exobasidium japonicum will cause unsightly disfiguration of the plant's leaves, but it often won't kill the plant entirely. As the disease progresses, the spots become white with a sort Read more
It will help to filter out toxins such as formaldehyde and benzene. Azalea (Rhododendron simsii) - Another good plant in order to keep formaldehyde at bay is azalea. Red-edged dracaena (Dracaena marginata) - Another good performer, this plant can remove xylene, trichloroethylene and formaldehyde.
Azaleas and rhododendrons create their flower buds for the following year within a couple of months after they have bloomed. Pinching back the new shoots before flower buds have formed can encourage them to branch more and produce more flowers the following year.
Bees are considered to be pollinators of many Rhododendron species (Ono et al., 2008; Georgian et al., 2015), and the effective pollinating insects for Rhododendron species can be more specialized than previously thought, with specialization toward pollination by bumblebees (Stout, 2007).
Although there is often little need for pruning rhododendrons, especially in naturalized settings, these shrubs respond well to the occasional trimming. In fact, excessive growth may require a heavy pruning. It is important to remove the flower stems from the shrub once blooming has ceased.
When shopping for rhododendron or azaleas, pay attention to when they flower. Early varieties can blossom in March, late ones into July or even the fall.
If it looks green or bright underneath, it's healthy; if it looks brown, the branch is probably dead. This winter and early spring were hard on rhododendrons, Brochu said, not so much because of the cold but because of wind, which dried out leaves until Read more
First off, the flowers of many rhododendron and azalea plants are chock full of nectar. When in bloom, these shrubs are like neighborhood fueling stations for bumble bees.
Rhododendrons are perfect spring-flowering plants for brightening up shady gardens. They succeed in partial or moderate (but not full) shade while azaleas – part of the rhododendron group – will thrive providing they get at least 4 hours or more of direct sun per day.
The rhododendron whitefly is mainly an aesthetic pest, although heavy infestations can damage susceptible plants. Biology and life history The insect overwinters as a nymph. There are several species of whiteflies. Some overwinter as adults on the undersides of evergreen leaves (salal, Oregon grape, rhododendron).
Some varieties naturally have a rounded, ball-shaped plant habit, others are open and spreading, while other rhododendrons have an upright growth habit. If they are not placed with height in mind the taller growing plants can shade out the shorter plants.
Best Time for Trimming Rhododendrons According to most professional landscapers, the ideal time for pruning rhododendrons is late winter, while the plant is dormant. However, any time between the first frost in fall and the last frost in spring (while the sap is low) will Read more
A: The usual suspects when rhododendrons fail to bloom are dense shade, drought or overfertilization. In spring, the plants use large amounts of water for new growth and flowers. Since their evergreen leaves can create an umbrella that sheds the rain, the poor plant's rootball Read more
Plant in full sun to increase flowers and avoid mildew problems. Shrubs need a minimum of 6 hours of full sun daily. Plant on the sheltered side of a windbreak. If subjected to cold, dry winds, their leaves and buds dry out and die.
Rhododendron roots require a high oxygen level (that's probably why they are shallow rooted) and an organic soil that supports mycorrhizae (the fungus that invades their roots and promotes their growth).
A leggy rhododendron is one that has not received proper maintenance pruning. This type of pruning involves removing faded flower clusters to prevent seed formation. This is a once-a-year chore and shouldn't take very long. It's best accomplished after flowers have wilted and before new Read more
Rhododendron is a genus of shrubs and small to (rarely) large trees, the smallest species growing to 10–100 cm (4–40 in) tall, and the largest, R. protistum var.
Along with butterflies and bees, ants carry pollen. This is a mutually beneficial relationship, a symbiosis; the ants eat the honeydew trails, helping both the rhododendron and the ant colony. This balance is a sign of a healthy ecosystem in the garden.
Overwatering does in about 75 percent of all rhododendrons purchased every year, the American Rhododendron Society notes. These statistics are intimately linked to the plant's requirement for well-drained soil and distaste for wet feet. Properly irrigating your plants requires resolving drainage issues as well.
The reason for rhododendrons not flowering are because of pruning the wrong time of year, frosts damage to the developing flower buds, drought, alkaline soils too much nitrogen fertilizer or a lack of sunlight. A late frost can damage flower buds (which turn brown) and Read more
Mulching: Rhododendrons do best when they have about a 2" to 3" layer of mulch to hold in moisture, prevent weeds, and keep the roots cool. A year-round mulch will also provide natural nutrients and will help keep the soil cool and moist.
Unlike deep-rooting shrubs such as yews, rhododendrons' and azaleas' roots run relatively close to the surface, usually within the top 12 inches of soil. They also have a vertical root structure from the center of the shrub which plunges the same depth or deeper, but Read more
When air temperatures go above 95°F (or even lower for alpine types), rhododendrons and azaleas appreciate a misting to prevent desiccation of their foliage.
Rhododendron simsii in bloom provide two to four weeks of beauty. Houseplant care: These hybrid forms are usually grown indoors for a single season as temporary winter and early spring flowering plants, but it is possible to keep them alive and attractive for several years Read more