Duke Zhou planted elms. What does it mean that Duke Zhou planted elms?

The implication of planting elm trees

Elm symbolizes abundance, wealth and good luck.

The implication of elm is wealth and good luck, because the elm of elm, like the pronunciation of surplus, represents wealth and surplus. Besides, elm trees will grow elm money before they grow leaves. Yucai is like coins used by ancient people, so it was very popular in ancient times. Usually planted in front of and behind the house, meaning a happy life. The remaining elms belong to deciduous trees, which can grow to about 25 meters high, and the DBH is 1 meter. The bark of young trees is smooth, and the big trees have irregular deep columns. The leaves are oblong, oval, oval-lanceolate, etc., and the leaves are smooth. Flowers and leaves bloom first, clustered, and samara is nearly round.