Jamieson, Fausset and Brown on Isaiah 40:24

24. they--the "princes and judges" (Is 40:23) who oppose God's purposes and God's people. Often compared to tall trees (Psa 37:35; Da 4:10).

not ... sown--the seed, that is, race shall become extinct (Na 1:14).

stock--not even shall any shoots spring up from the stump when the tree has been cut down: no descendants whatever (Job 14:7; see on Is 11:1).

and ... also--so the Septuagint. But Maurer translates, "They are hardly (literally, 'not yet', as in 2Ki 20:4) planted (&c.) when He (God) blows upon them."

blow--The image is from the hot east wind (simoon) that "withers" vegetation.

whirlwind ... stubble--(Psa 83:13), where, "like a wheel," refers to the rotatory action of the whirlwind on the stubble.