Yes.
While plants utilize CO2 to produce sugar, they also use the sugar as food, just like we do. This means that they also must have oxygen to burn the sugar and convert it to energy, again, like we do.
Consequently, just as we will suffocate in a CO2 rich atmosphere -- too much CO2, not enough O2 -- so will plants. What constitutes "too much CO2" for a plant will be different than the amount (concentration) that is too much for us. However, in either case (for us or plants), it probably would be more accurate to refer to "too little oxygen," rather than "too much CO2."
While plants utilize CO2 to produce sugar, they also use the sugar as food, just like we do. This means that they also must have oxygen to burn the sugar and convert it to energy, again, like we do.
Consequently, just as we will suffocate in a CO2 rich atmosphere -- too much CO2, not enough O2 -- so will plants. What constitutes "too much CO2" for a plant will be different than the amount (concentration) that is too much for us. However, in either case (for us or plants), it probably would be more accurate to refer to "too little oxygen," rather than "too much CO2."