Overview
Cardamine diphylla 'American Sweetheart' is a bushy herbaceous perennial in the genus Cardamine, part of the Brassicaceae family, with deciduous foliage. Cardamine diphylla 'American Sweetheart' grows best in full shade and partial shade, and tolerates loam soils and any pH. Its UK hardiness is rated H7. Suggested uses include cottage and informal garden and wildlife gardens.
About
Cardamine diphylla 'American Sweetheart' is a bushy, deciduous herbaceous perennial belonging to the genus Cardamine, known for its divided foliage and racemes of four-petalled flowers in spring and summer. This cultivar thrives in moist but well-drained loam soil, tolerating a range of pH levels from acid to alkaline. It prefers full to partial shade, ideally in sheltered, north-, west-, or east-facing aspects. Hardy to UK zone H7, it is suitable for cottage, informal, and wildlife gardens, and can be propagated by seed, bulbils, or division.
Growing conditions
Best soil and position for Cardamine
- Sunlight
- Full shade, Partial shade
- Soil type
- Loam
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Moist but well-drained
- Aspect
- North-facing, West-facing, East-facing
- Exposure
- Sheltered
- UK hardiness
- H7
Plant details
Cardamine diphylla 'American Sweetheart' size, habit and characteristics
- Plant type
- Herbaceous Perennial
- Habit
- Bushy
- Foliage
- Deciduous
- Suggested uses
- Cottage and informal garden, Wildlife gardens
Care notes
Pruning and caring for Cardamine diphylla 'American Sweetheart'
- Propagation
- Propagate by seed, bulbils or division
- Pest resistance
- May be susceptible to aphids and flea beetles
- Disease resistance
- Generally disease-free
Frequently asked questions
Where is the best place to plant Cardamine diphylla 'American Sweetheart'?
Cardamine diphylla 'American Sweetheart' prefers full shade and partial shade. It suits sheltered positions.
What soil does Cardamine diphylla 'American Sweetheart' need?
Cardamine diphylla 'American Sweetheart' grows best in loam soil. It is happy in soil of any pH. Aim for soil that stays moist but well-drained.
Is Cardamine diphylla 'American Sweetheart' hardy in the UK?
Cardamine diphylla 'American Sweetheart' has an RHS hardiness rating of H7, meaning it is fully hardy throughout the UK, tolerating temperatures below -20°C.
How do I propagate Cardamine diphylla 'American Sweetheart'?
Propagate by seed, bulbils or division.
More in the Cardamine genus
- Cardamine amaralarge bittercress
- Cardamine californica
- Cardamine quinquefolia
- Cardamine carnosa
- Cardamine granulifera
- Cardamine triphyllathree-leaved toothwort