PLANT HEALTH. Best planted from September through to March. Spray with insecticide at two weekly intervals. Rhododendrons and their relatives such as pieris and azaleas are very easy to move because they have a dense mat of fibrous roots very near the surface. Both Himalayan and tropical varieties grow best in a moist, well-drained lime-free acidic soil. Spray at two weekly intervals fungicide. A comprehensive information resource covering all aspects of Vireya Rhododendron culture, including cultivation advice, background history, classification & distribution, together with complete listings of named hybrids and Photogallery containing over 900 images. Make sure they are not shaded too heavily over the summer as this could inhibit flower bud set for the following season as well as encourage the plant to grow leggy and become sparsely foliaged. They can grow from 50cm up to 4 metres. There are over 100 varieties to choose from so see in-store for your preferred variety. The best time to plant is from winter to early spring before the new growth appears but they can be planted at any time of year as long as they are well watered through the summer months. When transplanting rhododendrons, the root ball must be as big as possible to ensure getting all the roots. Mites are minute sucking insects found on the underside of leaves in a fine webbing causing distortion, speckling and silvering of leaves to cause the leaves to go yellow (stippled or mottled) and dehydrated in hot dry weather. First dig out a planting hole twice the size of the root ball. When they finish flowering you should prune or trim the spent flowering heads. Winter pruning is better for more shocking trims because the plant is dormant, so its energy is not in its leaves or flowers. I would like to know when is the best time to prune back the plant and how, so it can continue to bloom. Learn how to grow rhododendrons in your garden with the RHS expert guide on choosing, planting, feeding, pruning and propagating plants. Sorry, we're unable to determine your location. Wet or alkaline soils can cause a lack of vigour and yellowish leaves. They have a very shallow root system so they can be easily grown in the garden. These Rhododendrons grow best in cooler climates with deep soil and high rainfall. In heavy frost climates prune in summer/ autumn. Here are a few varieties to consider: Best planted from March through to September. How to grow rhododendrons in a garden Choose a well-drained spot in the garden that gets dappled sunlight during the day and protection from the afternoon sun. Vireya (tropical) Rhododendrons have glossy leaves and flower for many months. When planting, dig a hole that is roughly twice the size of the root ball and loosen the removed soil. 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. Water each shrub deeply through the drier months. Avoid overhead watering. We were but one of several rhododendron nurseries in Taranaki and to … They do not like having wet feet and benefit from having a mound created for them to sit up above the soil level to improve drainage. Making sure the fertiliser is watered in immediately. Adding compost, potting mix or coir fibre will help. Spray with insecticide at two weekly intervals. At planting time, use 10-10-6 fertilizer before you water the plant in. When we started in the plant business back in the early 80s, rhododendrons were a hot ticket item. They add drama and a pop of colour to your garden, and come in a range of varieties. Improve drainage or lift up plants in wet soils. They have leathery leaves and are available in large and small flowered varieties. Without enough water in summer rhodos shut down their flower production for the following spring. The two main things to consider when selecting rhododendrons are your hardiness zone and the amount of space available for the plant to grow. Fertilizing rhododendron bushes isn't necessary if the shrubs are planted in fertile soil. Early symptom - light brown or whitish coloured circular spots on petals. After planting put down a layer of mulch to conserve moisture and help keep the weeds down. Rhododendron are appealing and colourful shrubs that are available in a wide range of sizes, leaf textures and forms and in shades of pink, red, white, yellow and blue. Protection from the afternoon sun will help prevent leaves from sun damage. A good mulch or gentle hand weed will take care of any weeds. The flowers appear in … This is caused by frost, rain or sunburn. Look carefully on old wood to find growth buds. Keep mulch away from the plant’s stem as this can lead to rot and pests. A lovely Rhododendron with deep green foliage and a neat and tidy habit. Prune just above the bud and new growth will appear there. Most amateur gardeners do not grow rhododendrons from seed, as they take between 2-10 years to flower. Small black sucking insect that cause the leaves to go silver and dry. Rhododendrons can be pruned easily and very effectively. Mulch and feed to keep the roots moist in summer. Usually hardy and easy care, they can be affected by Aphids and Mites which are easily sprayed for. Some tropical varieties are reasonably cold tolerant, but almost all of them dislike frost. Pruning is best done after flowering in late spring, this gives the plants the best possible chance of flowers for the following season. Besides the dazzling displays of flower, it is the variety of foliage and growth forms that make them such valuable landscaping plants. In hot areas, fall planting is recommended, as this allows the Please try again. Rhododendron specific fertiliser in late spring after flower finishes and just before new growth starts. After flowering is also the right time for pruning. R. macgregoriae is still going strong in our garden after 60 years Diseased flowers dry up and cling to the plant (leaves and stems are not affected). They have a very shallow root system so they can be easily grown in the garden. One of the best time to take cuttings is after flowering and when the new growth has started to harden (semi-hardwood cuttings) - usually sometime around November but it can be earlier or later depending on whether the plant flowers early or late. Most Wellington soils are the right pH for Rhododendron but you can dig through peat or add aluminium sulphate to bring it down. When pruning, look for a growth bud on the stem that you are wanting to cut. Position in full sun to dense shade. Spray early spring and summer to break the cycle, ensuring you get underneath the leaves. Note that if a plant dries out completely no amount of water will nurse it back to health. (04) 564-8391        Levin (Ohau), 132 McLeavey Road. Prune young plants and old plants to create the shape you like. Plant in semi shade, avoid Lime and mulch annually for best results. I have a Vireya rhodo Tropical Glow in a container plant in a semi shaded area and is about 1 m high. As flowering approaches add 5 ml teaspoon of 9 month Osmocote Plus per 200 mm pot or 5 litres of mix. Rhodos don't like their feet to be sitting in water, so ensure that the soil is free draining. Plants grown in shadier spots tend to be less compact than in full sun. Mix compost to the existing soil and back fill gently. Rhododendrons must have plenty of water. Dig in plenty of compost and organic material before planting. Rhododendrons & Azaleas. Space plants 2 to 6 feet apart, depending on their estimated mature size. Spray early spring and summer to break the cycle, ensuring you get underneath the leaves. 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. These varieties require plenty of water when new growth appears after flowering has finished. Stamping down the soil can break the delicate root ball. These plants form a branch of the ericaceae family and can offer a wide variety of plant sizes, flower colours, foliage types and plant forms, as well as lending themselves to interesting groupings. Like many groups of plants these are definitely one that you start to collect. Likewise other rhododendrons can be shifted into the backyard for the summer after they have finished flowering. As you travel around New Zealand you will notice rhododendrons growing in certain environments that you might not recognise as being particularly textbook conditions. In favorable climates the transplanting can be done at almost any time when the plant is not in soft growth, except at the very hottest times. Azaleas and Rhododendrons are versatile evergreen shrubs, popular for their vivid displays of flowers from late winter to early summer. Balling is when the flower bud starts to show colour but does not open and turns brown. Sorry, this page is unavailable right now. If only growing a few plants, an easy mix to convert is, a good indoor plant potting mix with the addition of 25% chopped sphagnum moss. Having evolved near the equator where the daylight hours are constant, vireya rhododendrons can flower at any time of year. Rhododendrons must have plenty of water. Move the plant to a more sheltered position. Wet or alkaline soils can cause a lack of vigour and yellowish leaves. Spots enlarge to form irregular blotches until whole flower collapses. Dig a hole as deep as the root ball and 2 times as wide. Check out the range we grow and see which will be your favourite. Rhododendrons are neat, bright shrubs that deserve a spot in your garden. Please try searching by suburb or postcode. They are a perfect choice for mixed borders, especially under other trees. YELLOWING OF LEAVES AND NATURAL LEAF FALL IN AUTUMN Rhododendrons, although evergreen plants, do lose some of their leaves. Enrich the soil with some compost and Yates Thrive Natural Blood & Bone with Seaweed before planting. You can also take stem cuttings from existing rhododendrons and plant them to grow a new plant. Pick off diseased flowers. Avoid weeding or cultivating around your Rhododendron as this can break the fine roots. Pinch out leggy branches after flowering to encourage shrubs to bush out. Plant Of The Month February - Tropical Vireya Add a touch of the tropics to your garden with vireyas, the tropical rhododendron. Improve drainage or lift up plants in wet soils. Enrich the soil with some compost and Yates Dynamic Lifter Soil Improver & Plant Fertiliser before planting. Wainuiomata, 285 Moores Valley Road. Most rhododendrons and azaleas in the landscape, even large ones, can be moved using proper care. Plants grown in shadier spots tend to be less compact than in full sun. Site: Plant the rhododendron out of the wind and in dappled shade, preferably from a high cover of limbs that will give filtered shade all day. Use a Rhododendron specific fertiliser immediately after flowering. They prefer full sun in winter, and part shade in summer. Well suited to Auckland’s climate, most varieties produce stunning bursts of flowers multiple times a year. Breeding has created many compact forms for smaller gardens. Do not use lime. Rhododendrons have fibrous root structures which are masses of tiny hair like roots that stay close to the surface. Move the plant to a more sheltered position, increase watering and mulch around the shrub. Leaves yellow and/or develop dark purple tone. How to Plant Rhododendron & Azaleas Plant in spring or early fall. Many varieties keep a naturally tidy habit but pinching off the new shoots at the end of the stems will encourage more buds further down to burst away. It’s a good idea to buy them when they are in flower, that way you can see their colour. Scale Insects suck the plant sap and appear as small brown lumps on the stems and foliage. How to grow rhododendrons in a garden. Additional payment options available at selected stores, To contact your local store 0800 4 6487310 The biggest pest is Thrips which causes silver leaves with brown spots underneath. In mild climates rhododendrons and azaleas can be planted almost any time of the year with reasonable success. The sub-tropical vireya rhododendrons thrive in our warmer humid regions. They combine well with Azalea, Camellia and Pieris and will look good with trees such as Cornus (Dogwood), Acer (Maples) and the range of Magnolia. Decline in vigour and leaves turn yellow while the veins remain green. Rhododendrons enjoy a cool spot in dappled shade but will tolerate full sun if well watered during dry spells. Most Wellington soils are the right pH for Rhododendron but you can dig through peat or add aluminium sulphate to bring it down. Try not to prune during a freeze. For example, P.J.M. Keep the pot in shaded conditions until roots start to form – usually within about six weeks. Advanced symptoms - Petals feel slimy. (06) 368-5025. Named to commemorate 100 years of nursing in New Zealand, it forms a reliable and floriferous mid-height shrub at 1.5m. This also helps suppress weeds and reduces watering need. When visiting your plant nursery, choose rhododendrons that are a deep green, and avoid yellowing or wilted plants. Posted by on 18 November 2019. ... ©2020 New Zealand Plant … They make fantastic container plants with thick shiny leaves and waxy flowers. In early spring, the rhododendron buds swell. The compact trusses of bloom appear in spring and are in tones of pale lavender and purple with a hint of red at the throat. These Rhododendrons grow best in cooler climates with deep soil and high rainfall. Generally, the conditions will have one of the above three points going for it. Click here for more info. Vireya (tropical) Rhododendrons have glossy leaves and flower for many months. Growing them is easy, this guide will show you how. They come in unusual colours like orange, salmon and red. Each flower consists of 4 narrow, crinkled, strap-shaped petals with red-p… It is commonly thought that Rhododendrons only grow in a cold climate, but tropical varieties are also available that prefer more temperate climates. If the plant cannot be transplanted immediately, it can be put in a container with plenty of mulch to keep the roots from dying in cold temperatures. Rhodo tips: Plant … Here are a few varieties to consider: PLANT TYPES Himalayan (cold climate) Rhododendrons. Plant Doctor Archive. They come in unusual colours like orange, salmon and red. Dig the planting hole twice as wide and to the same depth as the root-ball. These are evergreen shrubs, which flower from late autumn to early spring. In colder areas, early spring planting is recommended, with early fall planting being a second choice. Most varieties hold their leaves for two years and then in the third year, as summer progresses and autumn nears, the lower leaves drop off the stems. Spray with insecticide at 2-3 weekly intervals through summer. Here is a quick guide to pests and diseases that Rhododendrons can be prone to. Brown-black specks on the underside of leaves. Clusters of small sucking insects that appear on new growth. hybrids are among the most reliably cold-hardy rhododendrons. Cut the leaves in half to reduce water loss and stick in potting mix. Rhododendrons have a few requirements: excellent drainage, a soil pH between 4.5 and 6.0, and protection from hot afternoon sun. Rhododendron Fertilizer Schedule You’ll want to use a particular fertilizer composition for the different stages of your rhododendron growth. Mulch sparingly over the roots and feed with a rhododendron specific fertiliser in spring after the first flush of flowers. Deep watering is more effective than light sprinkling.   0800 4 MITRE 10. First published in the April issue of NZ Gardener and reprinted here with their permission. As a rule of thumb, the smaller the leaf, the more sun tolerant they are. Tropical: Position in full sun to dense shade. Some tropical varieties are reasonably cold tolerant, but almost all of them dislike frost. If garden soil is poor, feeding rhododendrons is one way to provide the plants with nutrients. Caring for my Vireya . Rhododendrons are hardy, evergreen plants that flower from late winter to early spring. In cold climates early spring transplanting is recommended. Rhododendron specific fertiliser in late spring after flower finishes and just before new growth starts. Brown edges on the leaf can be stress caused by dehydration from wind, sun or dry soil. Choose a well drained spot in the garden that gets dappled sunlight during the day and protection from the afternoon sun. An acidic (no lime), well draining but moisture retentive soil is preferred. There’s a broad range of mature plant sizes and temperature tolerances among rhododendron varieties. Without enough in summer they will shut down their flower production for the following spring. It is more important to make the planting hole wide rather than deep as Rhododendrons produce only limited deep anchoring roots but … Cutting in the winter is the best way to ensure that your plant will have new growth after you prune it. They prefer full sun in winter, and part shade in summer. On the whole Rhododendrons are really hardy, so if something looks amiss use ageneral insecticide or fungicide, or come and see us in-store. Product safety recalls: HPM Hot Water Connection Kit. Click on this article to learn how to fertilize rhododendrons. Dig the planting hole twice as wide and to the same depth as the root-ball. Shear your rhododendrons in the winter when you are doing large cuts. This stops them trying to grow seed and will put all that energy into new growth and next season’s flowers. They work well in most styles of gardens especially oriental and woodland. Slow, stunted growth. Autumn and Winter (in mild and moderate climates) is the best time to plant Rhododendrons. 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