TheNaturePlanet

In the cold winter, many flowering plants choose indoor maintenance because they cannot withstand the severe cold. However, there are also some flowering plants that, due to their excellent cold resistance, can overwinter safely in the outdoor open environment. This article will introduce several kinds of flowering plants suitable for overwintering outdoors.
Viola cornuta
Cold resistance ability: Viola cornuta is known for its strong cold resistance and can tolerate a low temperature of about minus 5 degrees Celsius. This enables it to overwinter outdoors in areas with relatively low winter temperatures such as Jiangsu, Zhejiang, and Shanghai. Viola cornuta is not only cold-resistant but also heat-resistant. It is a herbaceous plant that blooms frequently and has a particularly long flowering period, lasting at least half a year. It starts to be on the market from late October each year until around May of the following year. If properly maintained, it can even continue to bloom in June. Although the flowers of Viola cornuta are not as large as those of Viola tricolor, it has a larger number of flowers and stronger cold and heat resistance, making it very suitable for planting in winter.
Maintenance points: Viola cornuta has a high demand for light and needs to ensure sufficient sunlight. At the same time, keep the soil well-drained to avoid root rot caused by water accumulation. During the growth period, appropriate fertilization can be applied to promote flower growth.
Primula
Cold resistance ability: Primula also has strong cold resistance and can tolerate a low temperature of about minus 2 degrees Celsius. Its plant is relatively large, and when it blooms, the flowers are in clusters, with bright and vivid colors and great ornamental value. Primula is one of the important flowers that bloom in spring, but its cold resistance enables it to maintain a certain vitality in winter.
Maintenance points: Primula likes a humid environment, but it should be noted to avoid excessive moisture in the potting soil that can damage the roots. During the growth period, water can be regularly applied and the soil can be kept slightly moist. At the same time, Primula does not have high requirements for light and can be maintained in a semi-shady place.
Helleborus
Cold resistance ability: Helleborus, also known as hellebore, has many varieties and most of them like a cool environment. Among them, the black hellebore variety "Christmas Carol" is particularly cold-resistant and can tolerate a low temperature of more than minus 20 degrees Celsius, making it an ideal choice in cold outdoor environments in winter. It grows slowly but is evergreen all year round. It blooms from winter to early spring, and the flowers are white and charming.
Maintenance points: Black hellebore does not have high requirements for light and should be planted in a semi-shady place to avoid direct strong sunlight. In terms of soil, it is more suitable for weakly alkaline and humus-rich soil. When planting, peat soil, leaf mold soil, or compost soil can be added to improve the soil texture. At the same time, maintain good drainage to prevent root rot.
Marguerite
Cold resistance ability: Marguerite, also known as golden chamomile, has a certain degree of cold resistance and can resist a low temperature of about minus 1 degree Celsius. The old piles with partial lignification have stronger cold resistance. Marguerite has a long flowering period and abundant flowers and is one of the highly ornamental flowers.
Maintenance points: Marguerite likes a sunny environment. During the growth period, sufficient sunlight is needed to promote flowering. In terms of soil, fertile, loose, and well-drained sandy soil is suitable. At the same time, it should be noted to keep the soil moist and apply fertilizer in due time to meet its growth needs.
Viola cornuta, Primula, Helleborus, and Marguerite can all adapt to the outdoor overwintering environment to a certain extent. When choosing to plant these flowers, comprehensive consideration should be given according to local climatic conditions and maintenance conditions to ensure their smooth overwintering and show the best ornamental effect.