I am not aware of any plants that show signs of consciousness or feelings. This would even by disadvantageous to many plants because they "want" parts of them to be eaten to disperse seeds, pollen, etc.
Even if you accept that plants might be conscious and their suffering has to be reduced, you would still harm way fewer plants by eating them directly instead of eating other animals that consume them.
Perhaps you are not looking that closely? Plants have memory and demonstrate directed action through time and space. They can respond to touch, light, sound, and chemical signalling from other plants, insects, and fungi. What are the fingerprints of consciousness and feelings that you are looking for?