Origin
Lobelia subulata Klotzsch is commonly known as trailing lobelia and it is native to North America, specifically to the eastern United States, where it can be found growing in rocky and gravelly areas, along streams, and in wet meadows.
Common Names
The trailing lobelia is also called pale-spiked lobelia, creeping lobelia, and calico flower. It belongs to the Campanulaceae family, and its scientific name is Lobelia subulata Klotzsch.
Uses
The trailing lobelia is an attractive perennial plant with small blue flowers that are very popular in rock gardens, borders, and hanging baskets. Because of its trailing habit, it is particularly well-suited for use in container gardening, where it adds a softening effect to the edges.
In the wild, Native Americans used the leaves and root of the trailing lobelia to make a tea that was used to treat respiratory problems like asthma and coughs. They also used it as a poultice to soothe skin irritations and insect bites.
General Appearance
The trailing lobelia is a mat-forming, semi-evergreen perennial plant that typically grows to a height of about 6 inches with a spread of 18-24 inches. It has narrow leaves and produces numerous small, delicate flowers that bloom from late spring to fall. The flowers are typically blue or purple in color, but there are varieties that have white, pink, or crimson flowers.
Trailing lobelia prefers moist, well-drained soil and partial shade to full sun. It is relatively low-maintenance and is hardy in USDA zones 4-8.
Light conditions
The Lobelia subulata Klotzsch plant prefers to grow in full sunlight but can also tolerate partial shade. The plant's growth rate is dependent on the amount and intensity of light it receives. Therefore, it is advisable to grow the plant in an open area with direct exposure to sunlight for at least six hours a day.
Temperature requirements
Temperature plays a crucial role in the growth and development of Lobelia subulata Klotzsch plant. The plant can withstand cold temperatures ranging from 15°F to 95°F (-9°C to 35°C), making it suitable for growing in different climatic conditions. However, the plant prefers warm temperatures between 60°F and 85°F (16°C and 29°C), which encourages rapid growth.
Soil requirements
The Lobelia subulata Klotzsch plant prefers well-draining soils with a slightly acidic pH between 5.5 and 6.8. The plant can grow in different types of soils, including loamy, sandy, and clay soils, provided the soil is well-draining. It is important to ensure that the soil is rich in organic matter, and this can be achieved by incorporating compost or well-rotted manure into the soil. It is essential to avoid waterlogged soils as they can cause root rot, which can damage or kill the plant.
Cultivation Methods
Lobelia subulata Klotzsch is an easy-to-grow plant that thrives well in most soil types. It prefers areas with well-draining soil, full sun to partial shade, and moderate amounts of water. This plant is an excellent choice for rock gardens, borders, and containers. It is propagated through stem cuttings or by division.
Watering Needs
The watering needs of Lobelia subulata Klotzsch depend on the soil type, weather conditions, and the growth stage of the plant. The plant requires moderate amounts of water, and it is essential to water it deeply to encourage deep roots that can survive during dry conditions. It is crucial to avoid overwatering as it can lead to root rot and eventual death of the plant.
Fertilization
Fertilization is crucial for the healthy growth of Lobelia subulata Klotzsch. It is recommended to apply a slow-release fertilizer during the growing season. The fertilizer should be evenly distributed within the plant's root zone for optimal results. Too much fertilizer can result in excessive foliage growth and poor flower production.
Pruning
Pruning Lobelia subulata Klotzsch is not required, but it can help maintain the plant's shape and encourage denser growth. It is recommended to prune back the stems in the early spring before new growth starts. Deadheading spent flowers can also encourage further blooming during the growing season.
Propagation of Lobelia subulata Klotzsch
Lobelia subulata Klotzsch, commonly known as creeping lobelia, is a perennial plant native to North America. Propagation of this plant can be done by several methods, including:
Seed Propagation
Sowing seeds is an easy and affordable way to propagate Lobelia subulata. In the spring, the plant produces tiny seeds, which can be harvested after the seed pods have turned brown. The seeds should be sown in a well-draining soil mix and kept moist until germination occurs. It takes about 7-14 days for the seeds to germinate, depending on the temperature and other environmental conditions.
Cutting Propagation
Cutting propagation is another effective method to propagate Lobelia subulata. Cuttings should be taken in the early summer when the plant is actively growing. Take a stem cutting of about 3-4 inches in length with at least two nodes. Remove the lower leaves and dip the cut end in rooting hormone, then plant the cutting in a well-drained potting mix. Keep the soil moist and place the pot in a bright, but indirect light. New roots will develop in a couple of weeks.
Division Propagation
You can also propagate Lobelia subulata by division. The best time to divide the plant is in early spring, just before new growth starts. Carefully dig up the plant and divide it into multiple clumps, making sure each clump has a few stems and enough root system. Replant the divisions in well-draining soil mix and water thoroughly. Keep the soil moist until the plant is established.
Propagation of Lobelia subulata can be done by the above methods, which are easy and effective. Each method has its unique advantages and disadvantages, but with proper care, all methods should yield successful results.
Disease Management
Lobelia subulata is a hardy plant that is resistant to most diseases, but it can still fall prey to some common ones. Here are some of the diseases that can affect this plant and how to manage them.
Crown Rot
Crown rot is caused by the fungus Phytophthora species that thrives in areas with high humidity and poor soil drainage. It causes the roots and base of the plant to rot, leading to wilting and death of the plant. To prevent it, avoid over-watering the plant and ensure proper soil drainage. Moreover, remove diseased plants and soil in the infected area to prevent the spread of the fungus.
Pythium Root Rot
Pythium root rot is caused by a soil-borne fungus, Pythium aphanidermatum, and can be identified by the presence of brown roots that can eventually lead to damping off. The fungus thrives in damp conditions and can spread very quickly. To manage it, ensure that the soil is well-drained and has good air circulation. Also, avoid overwatering and use a well-draining potting mix.
Pest Management
Lobelia subulata is also susceptible to pest infestations. Here are some common pests and ways to manage them.
Aphids
Aphids are small, soft-bodied insects that can be identified by their pear-shaped body and long antennae. They suck the sap out of the plant and can cause wilting and stunted growth. To manage them, you can use insecticidal soap or neem oil to control their population. Additionally, try introducing natural predators like ladybugs and lacewings to control their population.
Spider Mites
Spider mites are tiny pests that thrive in hot and dry conditions. They are identified by the bronzing appearance of the leaves and the presence of webbing. They suck the sap out of the plant, leading to wilting and leaf drop. To manage them, you can use insecticidal soap or neem oil to control their population. Moreover, keep the area around the plant clean and spray them with water to keep them away.
