Seasonal activity of appreciating plum blossoms, typically in late winter to early spring. Often compared to 花見 (cherry-blossom viewing).
See also: 花見
We went plum-blossom viewing with the family on the weekend.
Compound of 梅 (ume, 'plum') and 見 (mi, 'viewing'), following the pattern of 花見 (hanami).