White Pine

In garden production, spray irrigation is commonly used for conifers to help cool the environment, reduce dust, and provide necessary moisture. I once encountered a situation where a park continuously watered white pines during a spring drought. Although this temporarily alleviated the dryness, later it was noticed that the trunks of the white pines had turned gray, and when touched, a powdery, whitish layer could be wiped off. Soon after, the needles of the B. sylvestris began to blister at the tips, forming a half-cone-like shape, with the tips failing to close properly. After careful observation and research, the author found several key points: First, all trees and surrounding turf that were sprayed showed the same "white powder," while plants not exposed to the spray did not exhibit this issue. Second, no signs of disease or lesions were found on the affected areas. Third, chemical analysis revealed that the "white powder" was primarily composed of water-soluble salts. Based on these findings, it can be concluded that the symptoms were not caused by pathogens but rather by the long-term use of high-hardness water in sprinkler irrigation. This led to salt accumulation on the needles, forming a thick layer that hindered normal metabolic processes, ultimately causing needle desiccation, shedding, and even tree death. It is therefore crucial to exercise caution when using high-hardness water for irrigation of white pines to avoid unnecessary damage and losses. Pinus bungeana, also known as the white fruit pine or three-needle pine, is a member of the pine family. It has three needles per fascicle, each measuring 5 to 10 cm in length. The leaves are dark green, hard, and shed their sheaths. The cones are typically solitary, ovoid, and measure 5 to 7 cm long, turning yellowish-brown when mature. The seeds are obovoid, about 1 cm long, with flowering occurring from April to May and fruiting from October to November. This evergreen tree often branches out from 0.5 to 1 meter above the ground, with sparse, sloping branches that give it a tall and majestic appearance. One of its most distinctive features is the evolution of its bark over time—developing into pinkish-white scales that flake off, creating a visually striking, elegant look. This beauty inspired the poet Zhang Song’s poem “White Pine,” which vividly describes the tree's graceful posture. In ancient times, due to its unique bark resembling a "white dragon," planting Pinus bungeana was restricted to imperial mausoleums and temples, as it was considered a symbol of power and reverence. The white pine is resilient, thrives in sunny conditions, has deep roots, and enjoys a long lifespan. It adapts well to various soil types, growing naturally on acidic, cool mountain rocks, and also performs well in deep, fertile calcareous soils or loess. This makes it an ideal choice for urban greening and beautification projects. First, its aesthetic appeal is remarkable. As an evergreen, it remains lush throughout the year. Its branches grow densely and evenly, and young trees do not require pruning to form a beautiful conical shape. Additionally, its milky-white trunk adds a unique charm, enhancing the overall landscape. Second, it has strong resistance to pollution. With increasing levels of sulfur dioxide and soot in urban areas, the white pine can resist sulfur dioxide and absorb dust and soot effectively. Studies show that one hectare of B. sylvestris can absorb up to 36.4 tons of dust annually, making it an excellent choice for planting along highways and between industrial zones and residential areas. Third, it is widely used in garden design. It can be planted alone or in groups, creating beautiful and effective landscapes. It pairs well with rockeries and rock formations, enhancing the visual impact of the garden with its dramatic pine peaks.

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