Lobelia siphilitica Alba
Lobelia siphilitica Alba
Lobelia siphilitica Alba
Lobelia siphilitica Alba
Blue Cardinal Flower, Great Blue Lobelia
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This plant carries a 12 months recovery warranty
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We guarantee the quality of our plants for a full growing cycle, and will replace at our expense any plant that fails to recover under normal climatic and planting conditions.
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Description
The Lobelia siphilitaca 'Alba' or White Lobelia is a charming, underused perennial in gardens. It has upright stems carrying large leaves at their base and tall flower spikes, from summer to early autumn, composed of pure white flowers. It will be perfect for adding beauty to your woodland areas or pond edges.
The White Lobelia is a tall, erect perennial native to North America. It has a fast growth rate and can reach a height of 60 to 90 cm (24 to 35in) with a spread of 30 cm (12in) per stem. Its leaves are dark green, lanceolate in shape, and alternate along the stem. The leaves are large at the base of the stem and become smaller towards the floral spike, similar to the leaves of foxgloves. During the months of August to October, floral spikes at the top of the stems will reveal progressively blooming flowers along the spikes. Its pure white flowers have a trumpet-shaped form, similar to Snapdragon (Antirrhinum majus), ending in two lobed lips curving outward.
The White Lobelia is hardy (-20°C (-4°F). Provide a relatively spacious area for the plant to grow and charm you with its vigor. It thrives in heavy, ordinary, moist to wet soils and tolerates short periods of root submersion.
It enjoys sunny exposures with moist soil, as well as shaded exposures. It is ideal in water gardens, pond edge borders, and woodland areas. It will be enhanced in a garden when planted alongside phlox, ornamental grasses, and astilbes.
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Lobelia siphilitica Alba in pictures
Flowering
Foliage
Plant habit
Botanical data
Lobelia
siphilitica
Alba
Campanulaceae
Blue Cardinal Flower, Great Blue Lobelia
North America
Other Lobelia
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Planting and care
Planting period
Intended location
Care
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Summer flowering perennials
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
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The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:
- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.