"Shade of trees" obviously stems from the contrast between midsummer and strong sunshine, but the latter "willow silk" is mostly used in early spring (note that it is "silk", not strips, branches and leaves), and "cool wind" is mostly used in autumn with peaceful environment. So the first two sentences are seasonal chaos, which gives people a feeling of piling up.
Don't use "drinking nonstop" when drinking tea, which is not only the host's pre-use mode, but also incompatible with the leisurely tea tasting.
......
The whole poem is far from artistic conception and wisdom. It is a good thing that young people like poetry, and there is much to read and think about.