Spiraea thunbergii is a plant species in the family Rosaceae. The plant is native to Japan, Korea and China. It is an evergreen shrub or small tree growing to 26 m tall. The leaves are alternate, simple, ovate to oblong-elliptic, 1.54 cm long and 0.5-3 cm broad, with a serrated margin. The flowers are white, borne in corymbs of 5-15 flowers in late spring or early summer. The fruit is a dry, brownish achene.
Related plant:
Spiraea Grefsheim
Related plant:
Spiraea Betulifolia
About soil condition, the Spiraea thunbergii aka Japanese Spiraea, is a deciduous shrub that is native to Japan. It prefers full sun to partial sun and well-drained soil, but it is adaptable to different conditions. This plant is low-maintenance and easy to care for. It is also tolerant of salt and pollution, making it a good choice for urban gardens.
Just like other types of Spirea, the Thunberg Spirea (Spiraea thunbergii) shrub is known for its beautiful clusters of flowers that bloom in the spring. But this particular variety is unique in that it is one of the few that can tolerate full sun. Most other varieties prefer partial sun or shade, but the Thunberg Spirea will do just fine in an area that gets six or more hours of sunlight per day. This makes it a great choice for planting in sunny borders or near patios and decks where other plants might scorch in the summer heat.
The temperature condition that is ideal for Spiraea thunbergii is between 60 and 65 degrees Fahrenheit. This plant is native to Japan, and it was first introduced to the United States in the late 1800s. The plant is named after the Japanese botanist, Carl Peter Thunberg.
Ideal humidity condition for this plant is moderate to high. It can tolerate some drought, but not excessive dryness. If the air is too dry, the leaves will begin to drop. If the air is too moist, the leaves will develop brown spots.
Discussing fertilizer, usually the plant food is classified into three main types: - Primary nutrients: these are the big three of plant food, nitrogen (N), phosphorus (P), and potassium (K). All three of these elements are essential to proper plant growth. - Secondary nutrients: these nutrients are not required in as large of quantities as the primary nutrients, but are still essential to plant health. These include calcium (Ca), magnesium (Mg), and sulfur (S). - Micronutrients: these nutrients are needed in very small quantities, but are still essential to plant health. These include iron (Fe), manganese (Mn), boron (B), copper (Cu), molybdenum (Mo), and zinc (Zn).
Pruning your spiraea thunbergii (spiraea thunbergii) is a great way to keep it healthy and looking its best. Pruning will encourage new growth, help to keep the plant compact and bushy, and prevent it from getting too leggy. When pruning, be sure to remove any dead or dying branches, as well as any branches that are crossing or rubbing against each other. You can prune your spiraea thunbergii in late winter or early spring.
Propagation of the Spiraea thunbergii, or Japanese spirea, is best done through softwood cuttings taken from new growth in the spring or early summer. The cuttings should be about 6 inches long and taken from the tips of the branches. They should be placed in a moistened soil mix and kept under high humidity until they have rooted. Once they have rooted, they can be transplanted into individual pots or into the garden.
Usually, the plant growth rate during the spring and summer. However, some species may have a growth spurt during the fall season. The average height is 3 to 6 feet, but some specimens can reach up to 12 feet tall. The growth rate is about 1 to 2 feet per year.
Common problems for this kind of plant are witches'-broom and Japanese aphids. These pests can cause the plant to become misshapen, with leaves and branches growing in abnormally. If left untreated, these problems can kill the plant.
Source:
Thunberg Spirea (Spiraea thunbergii)-Hort Answers - University of ...
Thunberg Spirea (Spiraea thunbergii) - Selecting Shrubs for Your Home ...
MELU Herbarium | Spiraea thunbergii