When the seedlings are unearthed and the cotyledons are unfolded, the primary leaves appear first, which are solitary, spirally arranged, linear and lanceolate, and the leaf margin is toothed. It takes 1 ~ 3 years for primary leaves to function as leaves, and then there are needles, usually 2, 3 or 5 bundles, which are inserted at the top of short branches. Each bundle of needles has a leaf sheath at the base, which falls off or exists early.

Pine is a monoecious plant, and its spore leaves are arranged like cones, forming female cones and male cones. Single or 2 14 female cones are attached to the top of new branches, and most male cones gather in the lower part of new branches. Pine cones usually bloom in spring and summer, but after the pollen reaches the female cones, it will not germinate until the early summer of the following year, so that the female flowers will fertilize and develop into cones (commonly known as pinecones or cones, not fruits).

growing environment

Pine trees are very adaptable to the land environment. They can tolerate the low temperature of -60℃ or the high temperature of 50℃, can grow in bare mineral soil, sandy soil, volcanic ash, calcareous soil, limestone soil and various soils from calcareous soil to red soil, and are drought-tolerant, barren and sunny, so they are famous pioneer trees.