en_tn_condensed/isa/44/04.md

They will spring up among the grass, like willows by the streams of water

The people of Israel being prosperous and multiplying is spoken of as if they were plants that grow because they have plenty of water. (See: rc://en/ta/man/jit/figs-metaphor)

willows

A willow is a tree with thin branches that grows near the water.