[tzestan]

Yes, fertilizers into pitchers. Delivered via syringe. It is hard to keep foliar spray droplets away from nearby sensitive plants. Pitchers are nutrient absorbing organs. Keep in the same pot makes sure they are getting same quality of light, soil, and water.

I don't stop insects getting into any picthers. All plants stand the same chance. If all of them get same amount of insects, none has advantage. If however, one plant attracts more than others and grows better, it just shows that the feeding recipe makes it more attractive to insects.

Delivering fertilizers through pitchers is convenient. This exercise is to see whether it produces significant improvements in plant appearance.