1, spruce means to climb to the top step by step. In ancient China, officials would plant seeds at home several times, hoping that they could rise in the officialdom step by step. Nowadays, in Huangshan, in addition to welcoming pine, spruce is often photographed in the same frame, or praying under the tree, hoping to rise step by step.
2, spruce also means longevity, in the right environment, spruce can theoretically live to 4000 years old. So spruce also means longevity. The ancients also planted spruce in front of their parents' yard, hoping that their parents would live a long life and be filial.