You can buy many green vegetables in summer easily, because they are in season.

在夏天你很容易能买到绿色蔬菜，因为它们是时令蔬菜。

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The summer season to endure hardship, balsam pear is undoubtedly good choice of vegetables.

夏季要吃苦，当季蔬菜苦瓜无疑是好选择。

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As the growing season progresses from the tender lettuces of early summer to the woody root vegetables of autumn, cooking methods and holding points should adapt, says Ms. Welsh.

WSJ: What to Do With an Abundance of Vegetables