Looks like you've had a visit from the bunny bastards! You need to put a chicken wire cage around the bottom about 2 ft. high so they can't get to the plant. If worried about stealth, weave some weeds and greenery into the screening, or cover with debris.

I have to do this when growing outside (not pot!). Baby rabbits will try to eat everything, including the bark off newly planted baby trees. :wtf::wtf::wtf: