Rhododendron Red Jack
Rhododendron Red Jack
Rhododendron Red Jack
Rhododendron
Purchased in 2021, it flowered timidly the first year but hasn't since. It's getting worse and worse, this year it's wilting, no longer producing any leaves or flowers, and turning yellow. Repotted into a pot to try and save it, nothing works. (and yes, it's definitely in the shade, cool soil, heather soil, and watered) Does anyone have any advice to save it, please? Thank you!
pia, 03/06/2025
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Description
The Rhododendron 'Red Jack' is a recent hybrid with beautiful vigour and a surprising ruby red spring flowering that catches everyone's attention. A beautiful bush with an upright habit, it is adorned with evergreen foliage of a dark matte green that perfectly highlights its large satin flowers, the red colour of which seems to radiate in the partially shaded areas of the garden. Volume, brightness, and colour are what this large Rhododendron offers, and it will fulfil all its promises in lime-free and moist conditions. Pair it with white, violet, or purple varieties in a large shrub border or even in a long hedge!
Rhododendrons are plants of the Ericaceae family, just like heathers, preferring mostly limestone-free and slightly acidic soils, as well as humid climates. The Rhododendron 'Red Jack' is a variety native to Japan and China and was discovered by the Boskoop research station in the Netherlands. It belongs to the perfectly hardy hybrid rhododendrons with large flowers. It forms a rounded bush with upright branches, slightly taller than wide. At maturity, it reaches 2m (7ft) in height and 1.75m (6ft) in width on average. Its growth is rather slow. Its evergreen foliage is particularly dense, consisting of large, slightly stiff, dark matte green elliptical leaves that cover the plant well. Flowering usually takes place in May, lasting for about 3 weeks. It is remarkably abundant, with beautiful large funnel-shaped satin flowers grouped in conical clusters. The colour is almost pure red, with a touch of pink in the throat. The petals of 'Red Jack' have slightly fringed edges and open to reveal red stamens.
Rhododendron 'Red Jack' is a flowering plant and very hardy, down to -20°C. Although they prefer partial shade, hybrid rhododendrons can tolerate morning sun as long as it is not scorching and their roots remain moist. 'Red Jack', with its abundant and vibrant flowering, attracts attention in the shaded areas of the garden. It can be planted alone, standing out in a bed of ferns and blue or variegated Hostas. It also pairs well with Pieris, Heathers, Kalmias, Skimmia, Azaleas, and Japanese Maples, as well as other rhododendrons of the same group to create beautiful patchworks of textures and colours in spring. Rhododendrons can also be used to create magnificent hedges, alone or with camellias or mimosas (in mild climates), for example. Cultivating them in containers requires regular watering with lime-free water and specific fertilizers for acid-loving plants.
Rhododendron Red Jack in pictures
Plant habit
Flowering
Foliage
Botanical data
Rhododendron
Red Jack
Ericaceae
Rhododendron
Cultivar or hybrid
Planting and care
Plant the 'Red Jack' Rhododendron in a partially shaded position, protected from cold and drying winds, in a cool, humus-rich and light soil, with a tendency towards acidity or neutrality. Like all plants of heathland, it does not tolerate limestone soils or heavy soils saturated with water in winter. If the soil remains moist in summer, this rhododendron can also tolerate morning sun exposure. Avoid planting around its base, as its shallow roots do not tolerate competition from other plants, especially for water resources.
Dig a hole three times larger than the pot volume. Soak the root ball in non-limestone water and plant the bush at the collar level, in a mixture composed of leaf compost, gravel or pumice, and loam. Water generously and keep the soil moist in summer. Azaleas and Rhododendrons have a shallow root system. As a result, they are susceptible to long periods of drought. That is why humus-enriched soil and abundant watering during dry periods are recommended. Additionally, this root system is not very strong, which is why it is essential to lighten heavy soils with draining materials (gravel, pumice, clay pellets) at planting. Apply a mulch of shredded pine bark around the base of the bush every spring to maintain soil moisture while keeping an acidic pH.
Maintenance involves removing faded flowers in summer and cleaning dead branches. Azaleas and Rhododendrons can sometimes be attacked by weevils that eat the edges of leaves and rootlets, as well as by the infamous "rhododendron beetle," which does not often cause severe damage. Yellowing of the leaves (chlorosis) in Rhododendrons indicates poor assimilation of iron from the soil and can cause premature death of the plant. While limestone is often the cause, poorly drained soil or deeply planted root balls can also explain the phenomenon.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
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