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