Azalea 'PENNSYLVANIA' swamp azalea (Viscosum group)
size/type
medium-sized shrub,medium-sized shrub
usual height
1,3-1,8m
usual width
1,3-1,8m
leaves
deciduous broadleaf
colour of leaves
flowers
showy
colour of flowers
blooming time
July
location
full to partial sun
soil type
acidic (peaty) to neutral
soil moisture requirements
tolerates (but does not demand) wet ground
winter protection
for zone 5+6
for zone 7
categorized
There are not many professional growers that would dedicate their time and money to crossbreeding interesting rhododendron and azalea species. It has mostly been the domain of enthusiastic amateurs or freelance botanists. The exception confirming the rule, apart from our well-known German nursery H.Hachmann, is the American company Weston Nurseries. It was founded in 1923 by Peter J. Mezitt, the son of Latvian farmers, who managed to escape Russian recruiters and left Europe for the USA, where he experienced the American dream. He worked as an estate gardener, earned a degree and married a woman who enthusiastically shared his passion for plants, so together they founded a nursery that still operates today. Next to their extensive work on crossbreeding rhododendrons they hybridize deciduous azaleas from the viscosum group (swamp azalea) which bloom late and have a distinct and sweet smell.
Description of the plant:
Pennsylvania azalea was bred by E.V. Mezitt from the Weston Nurseries and introduced in 1963. It is a cross between plum leaf azalea (a. prunifolium) and swamp azalea (a. viscosum). It bears single, deep pink flowers with a golden orange flare on the upper petal. Their perfume is sweet but less strong than on other varieties. Blooming time is perhaps the latest of all known swamp azaleas: mid to late July. As the flowers open on a fully leafed shrub, they look like glowing gems breaking through the coat of bright green leaves. Those are deciduous, broadly elliptic and in autumn turn a rich copper shade – something between orange and red. They are very resistant to powdery mildew. The plant grows rather slowly into a dense and compact shrub of almost equal height and spread.Swamp azaleas love damp soil and plenty of sun. The roots are shallow, spreading to sides in search for nutrients. Never plant them too deep. The soil has to be acidic (pH 4.5-5.5), rich in humus, cool and always moist. Ideal soil mixture is peat with lime-free, light garden soil topped with leaf-mould. For a nicer looking plant dead-head where possible. Hardy to about -34 °C (USDA zone 4).
Last update 22-01-2024
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