Overview
Petrocosmea 'Rosemary Platz' is a matforming alpine rockery in the genus Petrocosmea, part of the Gesneriaceae family, with evergreen foliage. Petrocosmea 'Rosemary Platz' grows best in partial shade, and tolerates loam soils and neutral pH. Its UK hardiness is rated H2. Suggested uses include patio and container plants.
About
Petrocosmea 'Rosemary Platz' is a matforming cultivar of the evergreen perennial genus Petrocosmea, known for its low rosettes of thick foliage. This plant produces small clusters of five-lobed, tubular to bell-shaped flowers in spring and summer. It thrives in partial shade with a north, east, or west-facing aspect, preferring sheltered locations and fertile, well-drained loam soil of neutral pH. Suitable for patio and container planting, it is hardy to UK zone H2 and can be propagated by seed or leaf cuttings.
Growing conditions
Best soil and position for Petrocosmea
- Sunlight
- Partial shade
- Soil type
- Loam
- Soil pH
- Neutral
- Soil moisture
- Well-drained
- Aspect
- North-facing, East-facing, West-facing
- Exposure
- Sheltered
- UK hardiness
- H2
Plant details
Petrocosmea 'Rosemary Platz' size, habit and characteristics
- Plant type
- Alpine Rockery
- Habit
- Matforming
- Foliage
- Evergreen
- Suggested uses
- Patio and container plants
Care notes
Pruning and caring for Petrocosmea 'Rosemary Platz'
- Propagation
- Seed, leaf cuttings
- Pest resistance
- Susceptible to slugs, snails, aphids, glasshouse whitefly, mealybugs, scale insects, tarsonemid mites
- Disease resistance
- Susceptible to mildew, crown, leaf, stem, and root rots
Frequently asked questions
Where is the best place to plant Petrocosmea 'Rosemary Platz'?
Petrocosmea 'Rosemary Platz' prefers partial shade. It suits sheltered positions.
What soil does Petrocosmea 'Rosemary Platz' need?
Petrocosmea 'Rosemary Platz' grows best in loam soil. It prefers neutral soil. Aim for soil that stays well-drained.
Is Petrocosmea 'Rosemary Platz' hardy in the UK?
Petrocosmea 'Rosemary Platz' has an RHS hardiness rating of H2, meaning it is tender, tolerating 1–5°C, and needs frost-free protection over winter.
How do I propagate Petrocosmea 'Rosemary Platz'?
Seed, leaf cuttings.
