TheNaturePlanet

During the cold winter, many flowers will enter a dormant period. However, some ornamental flowers can still grow vigorously in low temperatures and add vitality to the winter garden. Here are six kinds of ornamental flowers that can endure temperatures below - 10℃, including Hydrangea paniculata, Weigela florida, Deutzia scabra, Spiraea thunbergii, Iris and Spiraea.
Hydrangea paniculata
Hydrangea paniculata is a kind of flower with high ornamental value. There are many varieties. It has strong heat - resistance, sun - resistance and cold - resistance and can tolerate temperatures as low as - 20℃ or even - 30℃. Its flowers are conical in shape and have rich colors, including white, yellow - green, pink and red. In northern regions, Hydrangea paniculata can be cultivated outdoors and is very suitable for planting in the yard. However, when planting, it is necessary to ensure good drainage and avoid waterlogging. In addition, Hydrangea paniculata requires sufficient sunlight. It has a short dormant period every winter. After the spring gets warmer, the branches can be pruned to promote the growth of new branches and avoid the flowers from drooping due to overly long branches.
Weigela florida
Weigela florida is also known as "Five - colored Chinese Flowering Crabapple". It is a kind of ornamental shrub suitable for extensive cultivation. It can grow well in Northeast and Northwest China. It has strong cold - resistance and appropriate shade - tolerance. The flowering effect of Weigela florida is better under sufficient sunlight. Its flowers are in the shape of small trumpets and have bright and colorful colors. It generally starts to flower in summer every year. Weigela florida is very tolerant to pruning and is suitable for being a hedge plant or a landscape plant. When cultivating, the soil should be fertile, loose and have good drainage. It is very drought - tolerant but afraid of excessive water.
Deutzia scabra
Deutzia scabra is a perennial deciduous shrub with many varieties, different forms and strong ornamental value. Its plants are small and suitable for pot - planting or outdoor cultivation in the yard. The flowering period of Deutzia scabra is from March to May after the spring gets warmer every year. There are a large number of flowers and it looks elegant and romantic. During the maintenance process, it is necessary to pay attention to regular pruning to maintain a good plant shape. Deutzia scabra has strong cold - resistance and can tolerate temperatures not lower than - 25℃. It can overwinter outdoors in northern regions such as Beijing. However, after the leaves fall in winter or before sprouting in early spring, a light pruning is needed to cut off dead branches, diseased branches and overly dense branches.
Spiraea thunbergii
Spiraea thunbergii, also known as Fontanesia fortunei, is a very easy - to - cultivate deciduous shrub. It has strong adaptability, is tolerant to barren soil, high temperature, sun exposure and has good cold - resistance and can tolerate - 25℃. Spiraea thunbergii has a long flowering period and generally flowers from March to April every year. When planting, it is necessary to ensure that an appropriate amount of organic fertilizer is added to the soil, but not too much to avoid burning the roots. Spiraea thunbergii has low requirements for fertilization and only needs to apply base fertilizer once every 1 - 2 years in winter. In addition, it is necessary to cut off overly dense branches and dead branches to reduce the sources of insects.
Iris
There are many varieties of Iris with different ornamental values. The flowers are bright - colored and have graceful postures. It can grow in cold regions and even in Russia. Iris has strong cold - resistance and prefers a warm - cool climate. It grows robustly in the temperature range of 15 - 28℃. The Iris planted in the ground can tolerate - 9℃ in winter, so it can overwinter in the ground in many regions. During the maintenance process, it is necessary to pay attention to maintaining good drainage and avoid the soil being constantly wet. Iris requires a lot of sunlight, which is very beneficial to its growth. During the growing season, liquid fertilizer can be applied once every half a month and fertilization can be stopped after flowering.
Spiraea
Spiraea is a kind of ornamental flower suitable for planting in the north. It has extremely strong cold - resistance and can survive in temperatures below - 10℃ in winter. There are many varieties with different ornamental values. Some varieties have beautiful leaves and some have abundant flowers. Spiraea is suitable for being planted in large flowerpots to grow into shrub - like flowers and can also be planted in the yard. It has strong adaptability to the environment and can grow well in semi - shaded areas. In places with more sunlight, the flowering period is longer and the ornamental value is better. When planting, a thick layer of decomposed manure can be buried at the bottom of the soil and then the soil can be added to avoid the roots directly contacting the fertilizer. During the later maintenance period, it doesn't need to be taken care of too frequently. Given sufficient sunlight, it can grow very well.
These ornamental flowers not only have strong cold - resistance but also high ornamental value and can add a bright color to the winter garden. During the maintenance process, just pay attention to the basic requirements of drainage, sunlight and fertilization, and they can thrive.