Mine love my Louisiana Irises. They eat the blooms the second they emerge. They do not bother butterfly bush, salvia, lantana, rosemary, mint, lambs ear. Do yours eat gaura?
I know this is an old post but I’m adding what plants have survived my flock of buff orps, barred rocks, GL Wyandotte’s, welsummers, Easter Eggers in Houston Texas area:
Lavender
Rosemary
Lantana
Butterfly bush
Mint
Oregano
Thyme & Lemon thyme
Crepe myrtle
Geranium (one Easter Egger would nibble at it but the rest didn’t bother it in a pot. Deer ended up eating it all though.)
The chickens & deer ate my Mexican petunia down to nubs. The chickens seem interested in sampling anything pretty, like petunias.