A Riddle a Day -- 78 Logical and Mathematical Puzzles

Day 38 -- Riddle

I run away every day and return every night. I am the bane of a flower and a thieves delight.

What am I?

Sorry there was no weekend challenge, I've been a bit occupied. Today, an announcement will be made (maybe, sorta, possibly related to my upcoming fanfic Dark Dawn). Check the status updates on my profile page for more information.

Btw, fandom riddle coming tomorrow!