Lithotoma axillaris aka Isotoma Axillaris

Taxonomy ID: 10129

Lithotoma axillaris comes from eastern Australia. It is a tender perennial: it lives for years but tolerates little cold. It grows in subtropical climates. It belongs to Campanulaceae, the bellflower family. Garden sources also call it Isotoma axillaris. Other names are Laurentia axillaris and Solenopsis axillaris. Its common names include Laurentia. It keeps its leaves all year where it can survive. Since it withstands little cold, gardeners also grow it as an annual.

The plant forms a bush and has lobed leaves. The RHS gives its height and width as about 1.3 feet (0.4 metres). Its wider size range reaches 1.6 feet (0.5 metres) each way. Plants reach full size in one to two years. Blue, star-shaped flowers rise above the leaves. Each bloom can span about 0.1 feet (0.03 metres). Shades range from light blue to purple-blue. The RHS lists blooms from late spring through summer. Missouri Botanical Garden gives June until frost as the bloom season.

Grow it in full sun, with moist soil that drains well. It accepts clay, loam, sand, and chalk soils. It can grow in acid, neutral, or alkaline soil. Missouri Botanical Garden lists its water needs as medium. The RHS gives a UK hardiness rating of H3. It can thus survive winter outdoors in coastal and other mild areas only. Missouri Botanical Garden lists USDA zones 10–11. Its lack of cold tolerance helps explain its use in seasonal bedding.

Laurentia suits flower beds, borders, and pots. The RHS suggests gardens in courtyards and on patios, too. It also lists cottage gardens and those with an informal style. The blue blooms give the main show through the warm months. Remove spent blooms and trim the plant as needed. Grow new plants from seed or softwood cuttings. Missouri Botanical Garden rates its care needs as medium.

Both garden sources report few major pest or disease problems. The RHS says it is largely free of both. Missouri Botanical Garden still says to watch for aphids. Take care with stems: their sap can harm some people's skin or eyes through irritation. The RHS advises gloves and other safety gear when handling plants. The supplied evidence gives no use as food. It thus does not show that any part is edible.

Common names

Isotoma Axillaris, Rock Isotome, Showy Isotome, Blue Star, Star Flower, Laurentia

More information about Isotoma Axillaris

How difficult is it to take care of Isotoma Axillaris

Isotoma Axillaris requires a bit more attention and knowledge to thrive, making it a suitable plant for those with some gardening experience.

What are the water needs for Isotoma Axillaris

💧 Moist
Isotoma Axillaris should be watered regularly, allowing the soil to dry out between waterings.

What is the sunlight requirement for Isotoma Axillaris

Isotoma Axillaris requires abundant, bright and direct light. Placing it less than one foot from a window is the best way to make sure the plant receives enough light to survive and thrive. Depending on your region, however, the current weather can affect the placement of the plant in your home. For example, in some areas the sun may be too direct and intense, so it's best to place it farther away from the window. You may also need to adjust your placement according to the season as the sunlight can change intensity over the course of the year. If you live in a region with significant temperature fluctuations, such as a desert, you may need to place the plant a bit farther away from the window to avoid extreme heat or cold. With some care and attention, your Star Flower will be sure to bring you many years of beauty and enjoyment.

Is Isotoma Axillaris toxic to humans/pets?

Isotoma Axillaris is poisonous to humans if ingested. We suggest keeping this plant out of reach if you have children in the home.

More info:
Wikipedia • GBIF

Sources

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