Rhododendrons have no ultimate size, they can carry on growing indefinitely. The key is the annual growth rate, up to 60cm per year for the most vigorous and less than 1cm for the slowest growing.

Where is the best place to plant rhododendrons?

Unlike many blooming plants, rhododendron does not like full morning sun in winter and does best when planted in dappled shade on the north side of a building. Growing rhododendrons are happiest in a location protected from the wind and not under eves of a building.

What is the best time of year to plant rhododendrons?

• Mild climates: Rhododendrons and azaleas can be planted year-round.
• Cold climates: Early spring planting is best, with early fall planting a good second choice.
• Hot climates: Fall planting allows the plant’s root system to establish during the cooler months.

How far from a house should you plant a rhododendron?

Medium shrubs like Rhododendrons, Azaleas, Spirea, Holly and Boxwood go 2.5-3′ from the side of the house. I can easily walk behind the shrubs after planting.

Why is Rhododendron bad?

Its leaves are poisonous to animals. Its foliage is so thick that nothing can grow underneath. In 2014, two experienced hillwalkers had to be rescued when they became trapped in an “impenetrable forest” of rhododendrons.

Can rhododendrons grow in full shade?

Rhododendrons will grow nicely in full sun to moderate shade. A few Rhododendron varieties such as ‘Caroline’, ‘Scintillation’, Yakushimanum hybrids, ‘Hong Kong’ and the hardy varieties from Finland must have some shade in midday or the foliage will yellow or even burn – especially during a hot summer.

Do rhododendron have invasive roots?

All rhododendrons have shallow, wide-reaching roots to catch water and nutrients before they leach through the soil.

Do rhododendrons bloom twice a year?

When Do Rhododendrons Bloom? Because there are so many different types of rhododendrons and azaleas, blooming times can occur at many different points throughout the year. … However, certain species can bloom throughout the summer into the fall and even the winter.

Are rhododendrons good for privacy?

Rhododendron are evergreen, which means they provide great screening year round. They do extremely well on a property line to provide privacy. Around your house you need to pick a smaller shrub, and too often homeowners (or builders) pick a variety that simply gets too big!

Do rhododendrons make good hedges?

Our best selling range of rhododendrons with large flowers, blooming from January to July. These Hardy Hybrid Rhododendrons are ideal for hedging, screening or planting within borders. Typical height after 10 years will be between 140 – 200 cm.

Article first time published on

Do you need to deadhead rhododendrons?

Deadheading prevents the flowers from going to seed and rhododendrons should be deadheaded too in order to give the plant energy for more flower production next year. Deadheading will also give your rhododendron a tidier appearance until next year’s flowering period.

How do you keep a rhododendron small?

If not, Azaleas and Rhododendrons can be pruned to be kept small. Most varieties can be cut back if they get too large, with the exception of some species with smooth bark which will not regenerate. All small leaved Rhododendrons (Lepidote Rhododendrons) and deciduous or evergreen Azaleas can be cut back or pruned.

Do rhododendrons stay green all year?

Bursting with vibrant blooms in the spring and retaining their leaves through the colder months, rhododendrons are the perfect “evergreen” for your winter landscape.

Can you plant 2 rhododendrons together?

Rhododendrons (Rhododendron spp.) produce showy flowers and leathery lance-shaped green leaves. … Planting rhododendrons close together creates a mass planting, hedge or screen with bright spring colors.

Are rhododendrons bad for foundations?

Planting rhododendrons and azaleas too deep can eventually lead to plant death. Planting near concrete foundations or other concrete materials is to be avoided as the concrete creates alkaline conditions (a pH of 6 or above) that are harmful for healthy rhododendron and azalea growth.

Do Rhodos like sun or shade?

Traditional rhododendrons thrive in filtered sunlight and acidic soil. Newer varieties can tolerate a range of sunlight conditions, but always check the plant tag or description when shopping to make sure the plant needs match your garden conditions.

What is the difference between hydrangeas and rhododendrons?

Depending on cultivar and season, you can find rhododendrons sporting flowers in hues from bright orange red, deep red, purple, yellow, cream or gold-orange among their large green leaves. … Hydrangea flowers grow in ball-shaped clusters of blue or pink blooms.

What can I plant next to rhododendrons?

Rhododendrons thrive in more informal woodland-style gardens where they can be boosted with underplanting. Try woodland perennials such as hostas, pulmonaria, erithonium, ferns and hellebores. Another option is to combine them with woodland favourites like acers, cornus and deciduous camellia (Stewartia).

Do rhododendrons need a lot of water?

Rhododendrons are shallow-rooted plants that require water twice per week during the first growing season. … Though rhododendrons need consistent moisture, they do not do well when sitting in wet soils, so always allow the soil to dry between waterings.

Do rhododendrons multiply?

Though rhododendrons can be grown from seed, you can propagate new rhododendron plants from cuttings as well. … If you cannot take a terminal bud cutting, remove the flower bud before taking the cutting. Avoid branches near the top of the rhododendron or branches that have turned brown, as they are unlikely to root well.

Do bees like rhododendron?

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.

Why do bees like rhododendrons?

Rhododendron are insect pollinated and produce large amounts of sugar-rich nectar to ‘reward’ visiting pollinators. A number of species of bees are known to pollinate rhododendron, including honey bees. … The most important (by amount) diterpine in rhododendron nectar is grayanotoxin.

Is rhododendron safe for aquariums?

It is fine to use.. I’ve used it for many years with both aquatic and non-aquatic species. It is surprisingly long-lasting in the wet enviroment. If you have access to really old bushes the twisted large branches found in the center of the shrub are particularly great to use.

Should you mulch around Rhododendrons?

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. … It is best to mulch with a 2-inch layer of an airy organic material such as wood chips, ground bark, pine needles, pine bark or rotted oak leaves.

How long does a rhododendron live?

Average Rhododendron Lifespan The average lifespan of rhododendron is tens to hundreds of years when given the proper care and living in the correct climate. The oldest known rhododendron is an estimated 131 years old!

Do rhododendrons lose their leaves in winter?

Broadleaf evergreens, such as rhododendrons, lose water through their leaves even in winter when the weather is relatively warm and sunny or during periods of high winds. When the ground is frozen, the roots aren’t able to take up enough water in the soil to make-up for what is lost through the leaves.

Are rhododendrons poisonous to dogs?

All parts of the rhododendron plant are toxic for dogs. Symptoms include gastrointestinal upset followed by weakness, paralysis, and abnormal heart rhythms. Large doses can be fatal.

Do rhododendrons like partial shade?

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.

What is the prettiest rhododendron?

With some of the prettiest flowers, Rhododendron ‘Ken Janeck’ is a broadleaf evergreen rhododendron which, in mid spring, displays abundant clusters of about 13 to 17 soft pink trumpet-shaped flowers.

What is the easiest rhododendron to grow?

Easiest to Grow – Rhododendron catawbiense.

What is the fastest growing privacy shrub?

English laurel (or Cherry Laurel) can make an enormous fast-growing hedge. Under the right conditions, it can grow up to 3 feet per year! It does very well in heat. It has glossy evergreen foliage and makes a very attractive large hedge with regular pruning 1-2 times per year.