Hibiscus syriacus 'Marina' - hibiscus de gradina

Hibiscus syriacus 'Marina', also known as "Rose of Sharon Marina" or "blue hibiscus Marina," is a cultivar of the species Hibiscus syriacus from the Malvaceae family. This deciduous shrub, native to East Asia (China, Japan, Korea), is valued for its large flowers of a refined blue-violet shade and for its long blooming period from summer to autumn. 'Marina' stands out for its distinctive flower hue and compact stature, making it an excellent choice for borders, hedges, containers, or as a solitary plant in gardens.

Appearance of leaves, flowers, and fruits

• Leaves: The leaves are deciduous, dark green, ovate or three-lobed, with toothed edges, 5-10 cm long. They appear late, in May, and have a palmate-veined texture. In autumn, the leaves may take on yellowish shades before falling but do not offer a significant color display.
• Flowers: The flowers are large, 8-10 cm in diameter, trumpet-shaped, with 5 petals. The color is a delicate blue-violet, sometimes with a lilac tint, and a subtle red-purple center that adds contrast. They bloom from July to September, sometimes until October, each flower lasting one day but constantly replaced by new buds. The flowers have a faint scent and attract pollinators such as bees, butterflies, and hummingbirds.
• Fruits: It produces dehiscent capsules, green or brown, 1-2 cm in size, which persist through winter. These are not ornamental and contain seeds that can germinate easily, giving the plant a slightly invasive character in some regions.

Growth characteristics

• Height and width: It grows as a compact shrub, reaching 1.5-2.5 meters in height and 1-1.5 meters in width in 10-20 years. It has a vase-shaped form, with slender branches that arch slightly, ideal for smaller spaces.
• Vigor: Growth is moderate, with dense branching if pruned regularly. Flowers appear on new wood, making annual pruning beneficial.
• Type: It is a hardy deciduous shrub with a branched structure that can be shaped into various forms, including hedges, small trees, or standard shapes.

Growing conditions

• Exposure: Prefers full sun for abundant flowering but also tolerates partial shade, with a reduction in flower number. A sunny position sheltered from strong winds enhances the blue-violet shade of the flowers.
• Soil: Grows well in fertile, well-drained soils with consistent moisture, from slightly acidic to alkaline (pH 5.5-8). It tolerates poor soils but prefers a mix with compost or well-rotted manure. For pots, soil-based compost is recommended.
• Watering: Requires regular watering, especially in the first year, to keep the soil moist but not soaked. Once established, it tolerates moderate drought.
• Pollination: The simple flowers are very attractive to pollinators such as bees, butterflies, and hummingbirds, contributing to garden biodiversity.

Care and resistance

• Hardiness: It is frost-hardy, withstanding temperatures down to -15°C to -20°C (zones 5-9), suitable for temperate climates, including Romania. Young leaves may be affected by late frosts, and in severe winters, mulching the base is recommended.
• Fertilizing: Apply a balanced fertilizer (e.g., 10-10-10) in spring and summer to stimulate flowering. Benefits from regular feeding during the growing season.
• Pruning: Prune in February-March to encourage flowering on new wood, keeping 2-3 buds on branches from the previous year. Pruning helps maintain a compact and dense shape. Remove dead or damaged branches in spring.
• Pests and diseases: May be affected by aphids, spider mites, whiteflies, or Japanese beetles. Diseases include leaf spots, rust, or molds, especially in damp conditions. Good ventilation and avoiding wetting the leaves reduce risks.
• Propagation: Propagated by softwood cuttings taken in summer, layering, or seeds, although seeds may produce variable plants. Cuttings are the most reliable method to preserve cultivar traits.
• Toxicity: It is not toxic to humans or animals, and the flowers are edible, used in some cultures for teas or decoration.

Uses

Hibiscus syriacus 'Marina' is ideal for mixed borders, hedges, privacy screens, or as a solitary plant in gardens. Its blue-violet flowers add an elegant touch, perfect for cottage gardens, modern landscapes, or urban gardens due to pollution tolerance. It can be grown in containers on terraces, suitable for small yards because of its compact stature. It is excellent for attracting pollinators and creating a refined focal point in the garden.

Origin

Hibiscus syriacus is native to East Asia (China, India, Korea) but has been cultivated in Europe since the 16th century. The 'Marina' cultivar was selected for its unique blue-violet flowers and compact stature, being a relatively recent creation in ornamental horticulture. Hibiscus syriacus is the national symbol of South Korea, known as "Mugunghwa" (eternal flower), and is mentioned in the country's anthem.

Height including pot: approx. 30 cm