She and other experts note there is an exception for certain types of plants such as corn, which access CO2 for photosynthesis in a unique way. (scientificamerican.com)
If you specialize in certain types of plants, say roses or fruit trees, then be sure to add those to your resume. (thebalance.com)
So, the theories that certain types of plant foods and other types of plant foods shouldn't be eaten together makes little logical sense, even if you buy into the premise of the food - combining principle. (greensmoothiegirl.com)