Gregory the Dialogist

Whilst it is yet in his greenness, and not cut down, it withereth before any other herb. So are the paths of all that forget God, and the hypocrite's hope shall perish. Now it is well added, Whilst it is yet in his flower, nor plucked with the hand, it withereth before any other herb. 'The rush in his flower' is the hypocrite in esteem. Now the rush springing up with sharp edges is not plucked with the hand, in that the hypocrite, having his feelings sharpened by presumption, disdains to be rebuked for his wickedness. …

Morals on the Book of Job, Book VIII ↗

Thomas Aquinas

He shows that the rush requires moisture and sedge-bed requires water because they dry out easily by the mere removal of the marsh or water, when there is no other cause of their dehydration. But there is a twofold cause of dehydration in plants things which grow on land. One is natural from old age; the other is violent, when they are forcefully uprooted. Yet when neither cause is present, rush and sedge dry up from the mere removal of marsh or water. This is the meaning of, "Even at their freshest," i.e. …

Commentary on Job ↗