Lobelia × speciosa
Lobelia × speciosa is a plant in the annuals and biennials category that can grow 50cm – 1.5m tall and 10cm – 50cm wide. In this growing guide we’ll learn the cultivation details and how to plant Lobelia × speciosa.
This is a deciduous plant that takes 1-2 years to reach full maturity.
In this article
Plant profile
Common name: Lobelia × speciosa
Scientific name: Lobelia × speciosa
Plant type: Annual / Biennial, Bedding, Perennials
Habit: Clump-forming
Height: 50cm – 1.5m
Spread: 10cm – 50cm
Foliage: Deciduous
Sunlight: Full Sun, Partial shade
Soil: Chalk, Clay, Loam, Sand
Moisture: Moist but well drained, Poorly drained
Garden type: Informal Garden
Planting type: Flower borders and bedding
Seasonal colors
| Season | Stem | Foliage | Flower | Fruit |
|---|---|---|---|---|
| Spring | ||||
| Summer | ||||
| Autumn | ||||
| Winter |
How to plant Lobelia × speciosa (Lobelia × speciosa) – AfroBrazilian: Aleksandrs Balodis, CC BY-SA 4.0, via Wikimedia Commons
Annuals and biennials are ideal for formal or informal flower beds, but also for growing in pots and containers of all kinds. They are important plants for their rapid growth, instant color and relatively low cost.
They are also useful plants for filling spaces between newly planted trees and shrubs, as well as in perennial beds that may need to be revived after the first spring bloom.
They are an important ingredient in country house gardens and wildflower meadows.
Other types of Lobelia to consider:
See all Lobelia
How to plant
In this section we will learn how to plant Lobelia × speciosa, know its needs in terms of soil, watering and sun exposure.
Soil
Lobelia × speciosa is a plant that adapts to all types of soils, chalk, clay, loam or sand.
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The chalky soil is pale and contains chunks of calcium-rich rock. It is a fertile and well-draining soil, almost always alkaline.
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Clay soil is composed of more than 25 percent clay particles. These particles have a high moisture holding capacity and the soil is heavy to dig and can be waterlogged in winter (dry in summer).
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The loam soil is dark, rich in organic matter but balanced in minerals. It offers the best of all worlds, retaining enough water for the plants, but allowing excess moisture to drain away. This is the most desired type of garden soil, perfect for most plants.
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Sandy soil is light, porous and very easy to drain. It is a soil poor in organic matter and nutrients. It is composed of relatively large mineral particles that allow water to drain quickly.
It is not very sensitive to soil acidity or alkalinity and grows well in soils with pH acid, alkaline or neutral.
Regarding drainage, Lobelia × speciosa likes to grow in moist but well drained or humid or poorly drained soils.
Sunlight
Lobelia × speciosa is a plant that should be grown in full sun or partial shade positions.
Cultivation profiles – Growing Lobelia × speciosa (Lobelia × speciosa) – AfroBrazilian: Aleksandrs Balodis, CC BY-SA 4.0, via Wikimedia Commons
