Frequent
Incessant
な adjective
Something that is frequently overgrown is something that is super frequent. It never stops attacking, never stops coming, and is honestly getting incessant in how often it overgrows. Those darn [put plant name here].
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
お前は頻繁にくだらない事を気にし過ぎなんだって。
You frequently sweat the small stuff.