Rhododendron hybridum hort.
Rhododendron
Common names: Azalea
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Description
The rhododendron is an evergreen flowering shrub from the heath family (Ericaceae) and is one of the most popular ornamental trees in the DACH region. With its large flower spikes in white, pink, red, purple, or yellow, it provides colorful accents in the garden from April to June. It can be used as a solitary plant, in shrub groups, or as a naturalistic hedge under light trees, especially effective with ferns, hydrangeas, and other semi‑shade perennials. In commerce, almost exclusively hybrids and cultivars are available, such as the lime‑tolerant Inkarho® graft or early‑blooming varieties like 'Praecox'.
Care instructions
Plant your rhododendron in a semi‑shaded location with a humus‑rich, loose, and well‑drained acidic soil, peaty or lime‑rich soils are not tolerated. Water regularly with low‑calcium water, especially during dry periods and on frost‑free winter days, because the evergreen shrub also loses water in winter. After flowering, prune dead flower heads directly below the flower base to promote bud formation for the next year, shaping cuts are rarely needed. A drainage layer when planting helps avoid waterlogging.
Soil & site
Diseases & pests
6 relevantFrom the knowledge base, automatically linked by affected species. How to spot and prevent them is covered in full in the lexicon.
Otiorhynchus sulcatus
The vine weevil is the larva of the nocturnal beetle Otiorhynchus sulcatus and causes the actual damage.
More on Vine WeevilMangan-Mangel
Manganese deficiency shows itself as a net like chlorosis: the leaf veins stay green while the areas between them fade to light green or yellow.
More on Manganese deficiencyPhytophthora spp.
Phytophthora root and shoot rot is caused by soil borne fungi of the genus Phytophthora, which become active above all where there is waterlogging.
More on Phytophthora root and shoot rotPycnostysanus azaleae
Rhododendron bud blast is caused by the fungus Pycnostysanus azaleae and attacks above all rhododendron and azalea.
More on Rhododendron bud blastGraphocephala fennahi
The rhododendron leafhopper (Graphocephala fennahi) is a strikingly turquoise green leafhopper with orange red stripes that feeds on rhododendron and azalea from early summer into autumn.
More on Rhododendron leafhopperWassermangel
Drought stress arises when plants cannot take up enough water over a longer period, usually during persistent heat with no rain.
More on Drought stress (water shortage)Notes from real gardens
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