Roseum Maxumum Rhododendron
Rhododendron catawbiense 'Roseum Maximum'
Roseum Maxumum Rhododendron in bloom
(Photo courtesy of NetPS Plant Finder)
Height: 7 feet
Spread: 8 feet
Hardiness Zone: 5a
Other Names: Catawba Rhododendron
Outstanding large lilac colored blooms with golden blotches adorn this stately variety in mid spring; an accent or border shrub that will definitely stand out; absolutely must have well-drained, highly acidic and organic soil
Roseum Maxumum Rhododendron is covered in stunning clusters of lightly-scented lilac purple trumpet-shaped flowers with a gold blotch at the ends of the branches in mid spring. It has dark green evergreen foliage. The glossy narrow leaves remain dark green throughout the winter.
Roseum Maxumum Rhododendron is an open multi-stemmed evergreen shrub with an upright spreading habit of growth. Its relatively coarse texture can be used to stand it apart from other landscape plants with finer foliage.
This is a relatively low maintenance shrub, and should only be pruned after flowering to avoid removing any of the current season's flowers. It has no significant negative characteristics.
Roseum Maxumum Rhododendron is recommended for the following landscape applications;
- Mass Planting
- General Garden Use
Planting & Growing
Roseum Maxumum Rhododendron will grow to be about 7 feet tall at maturity, with a spread of 8 feet. It tends to be a little leggy, with a typical clearance of 1 foot from the ground, and is suitable for planting under power lines. It grows at a slow rate, and under ideal conditions can be expected to live for 40 years or more.
This shrub does best in full sun to partial shade. You may want to keep it away from hot, dry locations that receive direct afternoon sun or which get reflected sunlight, such as against the south side of a white wall. It requires an evenly moist well-drained soil for optimal growth, but will die in standing water. It is very fussy about its soil conditions and must have rich, acidic soils to ensure success, and is subject to chlorosis (yellowing) of the foliage in alkaline soils. It is somewhat tolerant of urban pollution, and will benefit from being planted in a relatively sheltered location. Consider applying a thick mulch around the root zone in winter to protect it in exposed locations or colder microclimates. This is a selection of a native North American species.