General characteristics of the Spirea
To the genre Spirea belonging to the Rosaceae family, belong several species of ornamental plants originating from Southeast Asia.
The spiree they are shrubs on average 1 meter high, composed of numerous arched, thin, not very branched stems.
THE drums they are covered with deciduous, toothed or lobed, dark green leaves.
THE flowers, white or pink, even if small, are collected in showy cluster inflorescences similar to the snowball viburnum.
THE fruits they are small capsules containing dark seeds.
The flowering period varies depending on the species: some bloom from late spring to summer, others from summer to early autumn.
Read also: Oriental poppy cultivation
Spirea, although adapting well to different light conditions, loves bright and sunny positions; tolerates both heat and cold quite well.
It grows vigorously in any type of soil while preferring that rich in organic matter and well drained.
generally it is satisfied with rainwater and should be watered moderately in periods of prolonged drought, in summer and especially if it is a young and recently planted specimen. In fact, in the first year of life, to make the roots better take root, even if moderate water supplies must be more frequent in order to keep the soil always moist and fresh. Sporadic watering compromises the health of the plant.
In spring to favor the vegetative restart of the plant and flowering, administer nitrogen fertilizer at the base of the bush with a good dose of potassium and phosphorus and also of microelements. When planting in open ground or in pots, it is advisable to enrich the soil with mature manure.
Pruning of the Spirea
The Spirea should be pruned after flowering to give harmony of shape to the foliage and to stimulate the regrowth of new shoots. Using well-sharpened and disinfected shears, dry stems are cut and long and messy ones shortened.
Pruning should be done immediately after spring flowering for white-flowered species, a end of winter oa early spring for the others.
You may be interested in: Decorating with plants: photos, ideas and tips
In particular, the pruning period varies according to the species:
- there Spirea Japonica Bumalda and the Goldflame they can be pruned about 10 cm from the base in February.
- there Spirea x Arguta is Spirea x Vanhouttei they can be pruned in summer immediately after flowering.
Multiplication of the Spirea
The reproduction of the coils can take place:
- by division of the tufts,
- by cuttings,
- by layering,
- by offshoot,
- through the suckers.
Multiplication by cuttings
The cuttings are carried out in two periods of the year: in summer or in Autumn.
In July August are carried out cuttings of semi-mature wood. The 8-12 cm long cuttings taken with well-sharpened and disinfected shears are put to root in a mixture of peat and sand.
Do you have problems with plants? Join the group
In October can be done cuttings of mature wood, 25-30 cm long.
After rooting, the new plants obtained from the two types of cuttings are transferred to pots and grown there for 1 or 2 years before being planted.
It is planted in autumn (October) or spring (March) in holes about 30 cm deep, 60 cm apart, if you want to obtain excellent results. On average, 3 plants are needed for every square meter.
This beautiful ornamental plant can be combined with other flowering plants that have the same pedoclimatic needs such as Forsythia, Kerria, Caryopteris, Gaura or evergreen plants such as Photinia and Eleagno.
Spirea: cultivation in pots
It is an ornamental plant suitable for being grown in the open ground but it can also be grown in pots without details by choosing a variety of Spirea which in full vegetative vigor does not exceed one meter in height.
For a small-medium size specimen, a 50 cm wide and deep pot should be used, filled with a compost made up of common garden soil and soil for flowering plants and a small amount of mature manure.
Expanded clay or coarse gravel can be used as drainage material for the bottom of the pot.
After potting, the Spirea should be watered regularly, especially during the summer. Even if it does not fear the cold, in winter, it is advisable to shelter it under a roof, close to a wall or a wall.
Repotting of the Spirea
It is carried out in spring, the season in which the plant wakes up from its vegetative rest.
Pot-grown Spirea should be transferred to a larger container when the roots come out of drainage holes.
- Repotting is done in early spring by extracting the plant with all the earthen bread that surrounds the roots.
- A new soil is used consisting of common garden soil mixed with soil for flowering plants and manure.
- To facilitate drainage, it is advisable to put a layer of expanded clay or coarse gravel on the bottom of the pot.
Pests and diseases Spirea
Spiree are very resistant ornamental plants and rarely suffer from fungal diseases such as powdery mildew and rust.
In periods of excessive environmental humidity they can be attacked by aphids that nest under the underside of the leaves and on the stems.
Cures and treatments
- Specific preventive pesticide treatments.
- Elimination of withered flowers to stimulate plant growth and the production of new floral shoots for the following year.
- In summer, to keep the soil moist and slow down the evaporation of irrigation water, mulch with straw or dry leaves at the base of the Spirea.
Variety of Spirea
There are several species of Spirea all cultivated for ornamental purposes.
Spirea x Arguta
Medium-sized shrub with a rounded shape, deciduous, with cascading, arched branches. The white flowers appear in April and are evenly distributed over the entire length of the branches. Tolerates partial shade, does not fear the cold. It can reach 2.5 m in height.
A plant on average 1 m tall. It forms a rounded bush composed of numerous stems with lanceolate, toothed leaves. From June to July it produces numerous flattened umbelliferous inflorescences composed of many small pink or purplish red flowers.
Spirea bumalda Gold Flame
This species, about 1.5 meters high, differs from the previous one in the color of the golden leaves which in autumn turn orange – red. In summer, from August to September, numerous red – purple flowers give bright spots of color. It is also suitable for growing in pots.
Spirea x Vanhouttei
A vigorous species that arches and flexible branches more than 2 meters long. it also adds the 2 m of During the flowering period, April-May, it produces cascades of white flowers that contrast with the dark green of the leaves. It resists the cold and is used as a hedge, path borders and to form large patches in spacious gardens.
A rustic variety that grows spontaneously along the waterways of the mountain and valley areas of northern Italy. In gardening it is widely used as an ornamental plant and in the medicinal field as a medicinal plant for beneficial properties explained by dried flowers. In herbal medicine it is used in the form of infusions as a calming, anti-inflammatory, diuretic, purifying and anti-cellulite. In the past, salicylic acid was extracted from the flowers of Spirea ulmaria, used in pharmacies for its antipyretic and analgesic properties.
The different species of Spirea are used for ornamental purposes in private gardens and public parks as single elements, in groups and in rows to create fencing hedges.
Properties of spirea
In traditional medicine, Spirea is used for the properties of salicylates, which are also present in willows.
As seen, especially the spirea ulmaria variety has many beneficial properties explained by dried flowers:
Is spirea poisonous or edible?
The nectar is edible and has a pleasantly bitter taste. This is why it is appreciated as a digestive.