Rhododendron × obtusum
Japanese azalea
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Description
The Japanese azalea is a compact, evergreen to semi‑evergreen ornamental shrub that bursts into a spectacular display of flowers in red, pink, violet, or white in spring. It is well suited for use as a border plant, in heath gardens, or as a container plant for terraces and balconies. Popular cultivars include ‘Rubinstern’ (deep red), ‘Adonis’ (pure white), and ‘Diamant Lilapurpur’ (bright purple). Even in winter, its glossy dark green foliage adds interest to the garden.
Care instructions
Plant in a semi‑shaded, wind‑protected spot in humus‑rich, well‑drained, acidic soil (pH 4.5 to 5.5). It thrives best under light trees. Water evenly with low‑alkalinity water, especially during flowering, and avoid standing water. Prune after flowering if necessary to protect next year’s growth. Protect young plants and container azaleas from frost by covering with fleece or mulch around the root ball.
Soil & site
Diseases & pests
5 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 leafhopperNotes from real gardens
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