Pine tree
松 matsu

Evergreen and long-lived, the pine stands for longevity and steadfastness; it leads the Three Friends of Winter and decorates the New Year.
Ancient Japanese New Year rites; Chinese 'Three Friends of Winter'
Pine was the traditional material of the kadomatsu, the New Year gate decoration set out as a resting place (yorishiro) for the year god who brings the harvest. As an evergreen it also heads the Chinese-derived 'Three Friends of Winter', called shōchikubai in Japan, where pine ranks highest. On formal kimono pine often appears with cranes and tortoises as a wish for long life.
Kadomatsu are still put out in pairs at New Year and burned after mid-January to send the god off.