Origin
Phacelia strictiflora (Engelm. & Gray) Gray var. connexa Constance, commonly referred to as the cohesive-lined Phacelia, is a native plant species found in western North America, particularly in the semi-arid regions of Arizona, California, and Nevada. It is a member of the waterleaf family, Hydrophyllaceae.
Common Names
Phacelia strictiflora var. connexa is commonly known by its cohesive-lined Phacelia title, given after its unique, densely packed flower clusters. Other common names for this plant include Filaree phacelia and Tufted phacelia
Uses
The cohesive-lined Phacelia has various purposes in the ecosystem, including being a food source for pollinators, such as bees and butterflies. It is also an attractive ornamental garden plant that can be used for landscaping. In addition, this species has the potential to stabilize soil and prevent erosion due to its deep roots, making it a useful plant for land restoration projects.
General Appearance
Phacelia strictiflora var. connexa usually grows up to 30 inches in height. The plant has simple leaves that are narrow and elongated, reaching up to 6 inches, with a tapered tip and rough-hairy texture. The flowers are blue-purple in color, with a trumpet-like shape, and closely packed in a dense spike-like cluster. This plant blooms from March to June, and the flowers attract a variety of pollinators. The fruit of the plant is a small, brown, and round nutlet.
Growth Conditions for Phacelia strictiflora var. connexa
Light: Phacelia strictiflora var. connexa thrives in full sunlight. It requires at least six hours of direct sunlight to grow and develop successfully. The plant can also tolerate partial shade, but it may lead to reduced flowering and slower growth rates.
Temperature: This plant species prefers moderate temperatures and is well adapted to a wide range of conditions. It can tolerate temperatures as low as 0°C and as high as 40°C. The optimum temperature range for its growth is between 20°C and 30°C.
Soil: Phacelia strictiflora var. connexa grows best in well-drained soils with a neutral to slightly alkaline pH range (6.0 to 7.5). Soil that is rich in organic matter is ideal for this plant species. Heavy, compacted, or waterlogged soils should be avoided as they can lead to poor growth and development.
Water: Adequate soil moisture is essential for the growth and development of Phacelia strictiflora var. connexa. The plant species requires regular watering, especially during dry periods. However, excessive water should be avoided as it can cause root rot and other fungal diseases.
Fertilizer: Phacelia strictiflora var. connexa does not require much fertilization. However, adding some organic matter, such as compost, at planting time can help improve soil fertility and provide a slow release of nutrients as the plant grows. Over-fertilization should be avoided as it can lead to excessive vegetative growth at the expense of flowering.
Cultivation
Phacelia strictiflora var. connexa is a native plant of southwestern North America that thrives in warm, arid climates. It can be grown in USDA zones 8 to 11 and requires well-draining soil with a pH range of 5.5 to 7.5 for optimal growth.
You can start the seeds indoors 6-8 weeks before the last frost, or directly sow them in the garden after the danger of frost has passed in spring or early summer. The seeds should be sowed at a depth of 1/4 inch and spaced about 6 to 12 inches apart.
Watering Needs
Phacelia strictiflora var. connexa is drought tolerant and can withstand periods of low water availability. However, it grows best when provided with regular water. Depending on the soil type and weather conditions, it is recommended to water the plant deeply once or twice a week. The soil should be allowed to dry out between watering cycles to prevent overwatering and root rot.
Fertilization
Phacelia strictiflora var. connexa is a low-maintenance plant that does not require frequent fertilization. However, adding a balanced fertilizer with an N-P-K ratio of 10-10-10 or 8-8-8 in early spring can promote healthy growth and blooming. Avoid over-fertilizing, as it can stimulate excessive leaf growth and reduce the number of flowers.
Pruning
Pruning is not necessary for Phacelia strictiflora var. connexa, as it has a natural bushy growth and does not become leggy or floppy. However, removing the spent flowers and seed heads can improve the plant's appearance and extend the blooming period. You can also cut back the entire plant to 1/3 of its height after flowering to promote fuller growth.
Propagation of Phacelia strictiflora var. connexa
Phacelia strictiflora var. connexa is a hardy plant that can be easily propagated from either seeds or cuttings.
Propagation by Seeds
Phacelia strictiflora var. connexa seeds can be sown directly into the soil, or they can be started indoors in pots. If starting indoors, use a high-quality potting soil mix and sow the seeds about 1/8 inch deep. Keep the soil moist and warm, and germination should occur within 7 to 14 days.
When sowing the seeds directly into the soil, ensure that the soil temperature is at least 60 degrees Fahrenheit. Sow the seeds about 1/4 to 1/2 inch deep and cover lightly with soil. Water the soil thoroughly, but be careful not to oversaturate it. Germination should occur within 14 to 21 days.
Propagation by Cuttings
Propagation by cuttings is a simple way to propagate Phacelia strictiflora var. connexa. To propagate using cuttings, take stem cuttings from healthy plants in early summer. Cuttings should be about 4 to 6 inches long and should be taken from the top of the plant, just below the flower or leaf node. Remove the lower leaves from the cutting and dip the cut end in rooting hormone powder.
Place the cuttings in a pot with a well-draining soil mix and water thoroughly. Cover the pot and cuttings with a plastic bag to create a humid environment. Keep the soil moist and warm, and the roots should develop within 3 to 4 weeks.
Disease and Pest Management for Phacelia strictiflora var. connexa
Phacelia strictiflora var. connexa is a relatively disease-resistant plant. However, it can be susceptible to certain diseases and pests. Here are some common diseases and pests that can affect the plant and ways to manage them:
Diseases
Fungal diseases such as gray mold and powdery mildew can affect Phacelia strictiflora var. connexa. These diseases can cause leaf spots, wilting, and stunted growth. To manage these diseases, remove and destroy infected plant parts, avoid overhead watering, and provide good air circulation. A fungicide may also be helpful in severe cases.
Pests
Phacelia strictiflora var. connexa can be a target of various pests such as aphids, spider mites, and thrips. These pests can suck plant sap, spread diseases, and cause deformation of leaves and flowers. To manage these pests, introduce natural predators such as ladybugs and lacewings or use insecticides such as neem oil or insecticidal soap. Additionally, keeping the plant healthy and well-nourished can improve its ability to resist pests.
