Lobelia siphilitica Clear Blue - seeds
Lobelia siphilitica Clear Blue - seeds
Lobelia siphilitica Clear Blue
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This plant carries a 6 months recovery warranty
More information
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
Lobelia siphilitaca 'Clear Blue' is a form of syphilitic lobelia or giant lobelia selected for its light blue, fresh, and bright flowers. It is a charming, floriferous perennial that thrives in moist to wet soil, sought after by pollinators. Its upright stems bear tall flower spikes from summer to early autumn. This giant lobelia appreciates sunny, non-scorching exposures, as well as not too dense shade. It is a perfect plant for flowering a light and humid understory or the edges of a natural pond.
The 'Clear Blue' syphilitic lobelia is a tall, upright perennial native to North America. It has a fairly fast growth and can reach 60 to 90 cm in height with a spread of 30 cm per stem. It first forms a rosette of large leaves just above the ground, then leafy stems. Its leaves are green, lanceolate and alternate along the stem. Large at the base of the stem, the leaves become smaller as they approach the floral spike. Flowering extends from July-August to October in the form of flower spikes at the top of the stems. The flowers bloom progressively along the spikes. The light blue flowers of this 'Clear Blue' variety have a trumpet shape ending in two cut and outward-curving lips. This perennial tends to be short-lived but self-seeds without becoming invasive if the conditions suit it. Its above-ground, deciduous vegetation dries up in autumn and regrows in spring.
The 'Clear Blue' syphilitic lobelia is hardy (-20°C). Plant this wildflower in large groups of 10 to 20 plants to showcase it best. 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 in soil that remains simply moist in summer. It is ideal in water gardens, in pond-edge beds, and in understories. Pair it with tall phlox, its brilliant cousin Lobelia cardinalis, Goat's Beard, Rodgersias, and the royal fern.
Attention, seeds suitable for experienced gardeners accustomed to sowing very fine seeds. These seeds are as fine as dust, barely visible to the naked eye.
Flowering
Foliage
Plant habit
Botanical data
Lobelia
siphilitica
Clear Blue
Campanulaceae
North America
Planting and care
Sowing:
Sow indoors from January to April. It is preferable to sow early in the year. Sow thinly on the surface of a special sowing compost kept slightly moist. Mixing the seeds with fine sand allows for a more uniform sowing of very fine seeds. The seeds need cold to germinate: place your sowing tray at 4°C for 2 weeks, then move it to a warm place at a temperature of 18-20°C. Germination takes 15 to 20 days. Transplant the plants when they are large enough to handle into 8 cm pots. Acclimate them gradually to the outdoors (in light shade) and plant them in the garden once the risk of frost has passed. Maintain a spacing of 45 cm between each plant.
Cultivation:
Lobelia syphilitica prefers moist and rich soil, preferably acidic to neutral (non-limestone), clayey and/or humus-bearing. It thrives in non-scorching sun or partial shade. Light shade will enhance the intensity of the flower colour. Ensure that the soil remains moist until the plant is well established. Mulch the soil in summer to conserve moisture. Water if necessary during hot and dry weather. If you allow the plants to produce seeds, you can harvest them in late summer to sow them wherever you like. Spontaneous seedlings are not uncommon, but this plant is never invasive. Moreover, young misplaced plants are very easy to remove.
Sowing period
Intended location
Planting & care advice
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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).
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 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.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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