As it's inscribed on something, I think the chance to get two characters in reversed order might be small.
It should mean to be 萱花草, yes the Hemerocallis fulva: 萱花草,又名萱草,俗名:忘忧草
The flower language: 1) Forget your sadness; 2) Thank you mum. 3) Hide some of your complicated feelings...
BTW, on what surface was this inscribed on?