Origin
Delphinium gommingeri Volkens ex Engl. is a plant species that belongs to the Ranunculaceae family and is native to Ethiopia.
Common Names
The plant is commonly known as Gommer's Larkspur or Blue Delphinium.
Uses
The plant is mainly grown for ornamental purposes due to its tall and showy spikes of blue flowers. It is a popular choice for adding color and vertical interest to perennial borders and cottage gardens. The flowers are attractive to pollinators such as bees and butterflies.
However, the plant contains toxic compounds such as delphinine and can be harmful if ingested, thus it is not recommended for medicinal or culinary uses.
General Appearance
Delphinium gommingeri is a herbaceous perennial that grows up to 1.5 meters tall. The plant has deeply lobed leaves that are dark green in color and arranged in a basal rosette. The tall flower spikes emerge from the center of the plant and are covered in numerous small blue flowers with prominent white centers. The flowers are arranged in a loose pyramidal shape and can bloom from late spring through summer. After blooming, the flowers give way to long, slender pods containing numerous small seeds.
The plant prefers full sun to partial shade and well-drained soils. It is also tolerant of cold temperatures and can be grown in USDA hardiness zones 3-9.
Light Requirements
Delphinium gommingeri Volkens ex Engl. requires full sunlight to grow properly. It cannot tolerate shade or partial sunlight and must be placed in an area that receives at least six hours of direct sunlight daily.
Temperature Requirements
The ideal temperature range for the growth and development of Delphinium gommingeri Volkens ex Engl. is between 60°F and 75°F (15.5°C to 24°C). This plant is adapted to thrive in cool temperate climates and cannot tolerate hot and humid conditions. Thus, it is recommended to grow this plant in regions that have moderate temperatures throughout the year.
Soil Requirements
Delphinium gommingeri Volkens ex Engl. prefers well-draining soil that is rich in organic matter. The ideal soil pH range for this plant to grow is between 6.0 to 7.5. It is adapted to grow in various soil types, including loamy, sandy, or clayey soils. However, it is important to note that the plant cannot tolerate waterlogged or poorly-drained soils. To ensure proper growth and development, it is recommended to amend the soil with compost or well-rotted manure before planting.
Cultivation
Delphinium gommingeri Volkens ex Engl. is a flowering plant that thrives in full sun or partial shade. It is essential to grow this plant in well-draining soil, rich in organic matter.
It is best to grow Delphinium gommingeri from seeds or cuttings, and the best time to plant is in the early spring or fall. When planting, ensure you space them about 12 to 18 inches apart from each other.
Watering Needs
Delphinium gommingeri Volkens ex Engl. requires adequate watering for optimal growth and flowering. During the hot and dry summer months, ensure that you water regularly to keep the soil moist. However, ensure not to overwater, as the plant is susceptible to root rot.
It is best to water the plant in the morning, which gives the plant enough time for the foliage to dry before nightfall.
Fertilization
Delphinium gommingeri Volkens ex Engl. requires fertile soil to thrive. Therefore, it is essential to fertilize the plant at least two times a year, during the spring and fall months.
Use a balanced fertilizer, preferably one with equal parts of nitrogen, phosphorus, and potassium, to ensure proper growth and the development of beautiful blooms.
Pruning
Pruning Delphinium gommingeri Volkens ex Engl. is essential for maintaining plant health and encouraging healthy growth. Cut back the plant's spent flowers after the blossoms fade to encourage more blooms.
Additionally, cut back any yellowing foliage or dead stems to promote the growth of new leaves and keep the plant looking its best. It is best to do this in the early spring or fall months when the plant is dormant.
Propagation of Delphinium gommingeri Volkens ex Engl.
Delphinium gommingeri Volkens ex Engl. can be propagated by both seeds and cuttings. Here is a detailed explanation of both methods:
Propagation by Seeds
The best time to collect seeds is at the end of summer. The seeds of Delphinium gommingeri Volkens ex Engl. have a hard coat, so it is advisable to soak them in water for 24 hours before sowing. The seeds should be planted in a seedbed that has been prepared with well-draining soil mixed with organic matter. They should be sown at a depth of around 3-4 mm in rows that are spaced 30-40cm apart. The seedbed should be watered regularly to ensure that the soil remains moist. Germination should occur within 2-3 weeks. Once the seedlings reach a height of around 5-6cm, they can be transplanted into their permanent positions.
Propagation by Cuttings
Propagation by cuttings can be carried out in spring or autumn. Cuttings should be taken from the basal shoots of healthy and disease-free plants. The cuttings should be around 5-7cm long and should have at least 2-3 pairs of leaves. The lower leaves should be removed, and the remaining leaves should be cut in half to reduce transpiration. The cuttings should be planted in pots or trays that have been filled with a mixture of potting soil and sand in equal proportions. The cuttings should be watered well and placed in a sheltered spot with bright, indirect light. After around 4 weeks, new growth should appear, and the plants can be moved to their permanent positions in the garden.
Disease and Pest Management for Delphinium gommingeri Volkens ex Engl.
Delphinium gommingeri Volkens ex Engl., commonly known as Gomminger’s larkspur, is a species of flowering plant that belongs to the Ranunculaceae family. This plant is native to the highlands of East Africa and is grown in many parts of the world as an ornamental plant. However, like other plants, it is susceptible to various diseases and pests that can damage its health and appearance. Here are some common diseases and pests that may affect Delphinium gommingeri and ways to manage them.
Common Diseases
Crown rot: This disease is caused by a fungal pathogen that attacks the crown and roots of the plant, causing it to wilt and eventually die. To manage this disease, it is important to avoid overwatering and ensure adequate drainage. Also, avoid planting in areas where other infected plants have been grown.
Rust: This disease is caused by a fungal pathogen that causes orange, powdery spots on leaves and stems. To manage this disease, remove infected leaves and stems and dispose of them properly. Fungicides can also be used to control the spread of the disease.
Common Pests
Aphids: These tiny insects feed on plant sap and can cause deformities in the leaves and stems. To manage aphids, introduce natural predators into the garden, such as ladybugs and lacewings. Insecticidal soap can also be used to control the infestation.
Spider mites: These pests are tiny and difficult to spot, but they can cause leaves to turn yellow and eventually fall off the plant. To manage spider mites, use a horticultural oil or insecticidal soap to control the infestation. Also, avoid overfertilization, which can attract spider mites.
By taking preventive measures and identifying diseases and pests early, you can help protect your Delphinium gommingeri plant from damage and ensure its health and beauty for years to come.
