{Ye root up the wheat with them} (ekriz(9373)(8874)e hama autois
ton siton). Literally, "root out." Easy to do with the roots of
wheat and darnel intermingled in the field. So sullegontes is
not "gather up," but "gather together," here and verses  28  and
 30 . Note other compound verbs here, "grow together"
(sunauxanesthai), "burn up" (katakausai, burn down or
completely), "bring together" (sunagete).