A.T. Robertson Commentary Luke 8:6

"And other fell on the rock; and as soon as it grew, it withered away, because it had no moisture." — Luke 8:6 (ASV)

Upon the rock (επ την πετραν). Mr 4:5 "the rocky ground" (επ το πετρωδες), Matthew 13:5 "the rocky places.

As soon as it grew (φυεν). Second aorist passive participle of φυω, an old verb to spring up like a sprout.

Withered away (εξηρανθη). First aorist passive indicative of ζηραινω, old verb, to dry up.

Moisture (ικμαδα). Here only in the N.T., though common word.