Rhododendron decorum is native to northern Myanmar and Guizhou, Sichuan, Xizang, and Yunnan, China. It grows in high forested regions at elevations of 1000-3300 meters above sea level.
Rhododendron decorum also called as Great white rhododendron, is a species of the genus Rhododendron. This species was described by Adrien René Franchet in 1886 and has gained the Royal Horticultural Society’s Award of Garden Merit.
IDENTIFY RHODODENDRON DECORUM PLANT
Rhododendron decorum is native to northern Myanmar and Guizhou, Sichuan, Xizang, and Yunnan, China. It grows in high forested regions at elevations of 1000-3300 meters above sea level.
It is an evergreen shrub or small trees which reaching 1-6 m tall with young shoots greenish, glabrous that has thickly leathery, oblong, oblong-ovate or oblong-elliptic, 5-19 x 3-11 cm leaves.
Great white rhododendron blooms in April to June from the 8-10 flowered inflorescence that carry large, funnel-campanulate, very fragrant flowers. The flowers are white to pale pink with a yellow throat.
RHODODENDRON DECORUM PLANT CARE AND CULTURE
Cultural information should only be used as a guide, and should be to be adapted to suit you. Your physical location; where you grow your plants, how much time you have to devote to their care, and many other factors, will need to be taken into account. Only then can you decide on the cultural methods that best suit you and your plants.
Light:
Rhododendron decorum need ample protection from wind and direct afternoon sun. Do not plant them in windy spots. Around buildings, they do best on the east or north side. In open areas, they like alternating sun and shade. Plants may survive continuous shade if trees have branches pruned high. Fences, shrubbery, or screens may also give protection from afternoon sun.
Temperature:
In spring and summer, the ideal temperature for growth is 18–22 ° C. In autumn and winter, these plants goes to a rest period which last 1.5 - 2 months with a temperature of 12–15 ° C. Winter damage may occur at infrequent intervals, usually due to lack of dormancy in the plant when cold weather occurs. To help development of winter hardiness, avoid adding large amounts of nitrogen after July.
Substrate, growing media and repotting:
Great white rhododendron grow best in well drained soils that contain an abundance of organic matter. The addition of leaf mold, peat moss, or other organic matter will help almost all soils. They prefer acid soils with a pH of roughly 4.5-5.5. When planting, dig a hole twice the size of the root ball. Mix the excavated soil with soil amendments and place enough improved soil in the bottom of the hole so the top of the root ball is slightly higher than the surrounding soil. Fill the hole to the top, watering as you fill to settle the soil and eliminate air pockets. Allow the plant to establish itself in the new location before adding any fertilizer.
When properly grown, the plant can be transplanted successfully at any time of year if they are given special care in watering and protection from drying and freezing. The ideal time to transplant these plants is during their dormant season, either in the fall or early spring while temperatures are cool and soil moisture is plentiful.
Watering:
Rhododendron decorum need ample water during the summer. If they are planted under wide eave overhangs, furnish water during the entire year. Keep in mind that although these plants need moisture, they will not thrive in wet, poorly aerated soils.
Use mulches to control weeds, conserve moisture, and provide more uniform soil temperatures. Mulches can be made of sawdust, bark dust, peat moss, straw, or other organic materials. If these materials are incorporated into the soil after serving as a mulch, add some nitrogen to assist in decomposition of the woody materials.
Avoid excessive irrigation in fall. Plants kept dry in September will tend to harden off and be better prepared for the winter. If the fall has been excessively dry, watering should be done after the first killing frost. At that time watering will not reduce winter hardiness but will prepare the plant for winter. The soil should be thoroughly moist before cold weather sets in. The best time for fall watering is about Thanksgiving.
Fertilizer:
Avoid the excessive use of lime or alkaline fertilizers around azalea and rhododendron plants. If necessary, apply nitrogen fertilizers or mixtures (either organic or inorganic) containing nitrogen, phosphorus, and potassium soon after flowering in the spring. Relative merits of an organic fertilizer as compared to a chemical fertilizer depend on whether the slow availability and less frequent application of the organic type can justify the extra cost. A light application of a fertilizer formulated for acid-loving plants may be added to the surface before the mulch is applied. Fertilizing should be done in April or May, but don’t fertilize after July. Late summer fertilization may force out tender fall growth that will be killed by the winter.
Pruning:
If new plants are selected properly, taking into consideration mature plant size and space to be filled, little pruning should be necessary. Remove dead and injured branches. If pruning is necessary, prune the plants soon after flowering to allow flower bud formation for the following year. “Dead-heading” is a pruning operation that involves removing spent flower clusters. It should be done annually.
Propagation:
Great white rhododendron can be propagated by air layering or stem cuttings. They can self-propagate by sending up shoots from the roots. Sometimes an attached branch that has drooped to the ground will root in damp mulch, and the resulting rooted plant then can be cut off the parent rhododendron. Cuttings may be made at any time, but June to July cuttings seem most ideal for rooting azaleas, and August to September cuttings seem best for rhododendrons. Make cuttings 3 to 4 inches long, remove lower leaves, and place the cut end in rooting medium. Equal parts of peat moss and clean sharp builder’s sand make an ideal rooting medium. After roots are formed, place the plants in pots or in a protected area and keep well watered.
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