We planted several Mexian sages (Salvia leucantha) 3-4 weeks ago. They had taken very well to our hot, dry weather (Sacramento, California - Zone 9) and being watered on a drip system. Here's a picture of one of them to show their former size/condition:
Unfortunately, this morning my 3 year-old son decided to stomp the ever-living daylights out of several of these, breaking off all or nearly all of the stems. Here are two pictures of stomped plants, with breakage locations and surviving shoots circled:
Some of the stomped plants have no surviving shoots; all that remains above ground is about two inches of woody growth.
Should I give up on these and replace them with new plants, or is there a chance they'll survive and recover? If they could recover, how long should I wait and what signs should I look for?