Okay, about two years ago I had an 18incher came up. Since then I had split that plant in two. One half is doing really well and has about 20 pitchers but they're all normal size, not very tall. The other half, i'm not sure what it's doing. Last year it only put out two pitchers, both were pretty massive at about 16 inches tall, then about a week ago it finally started growing two more pitchers, one pretty small and the big one is 24inches tall so far! It hasn't opened up yet and i'm guessing once it does the actual pitcher is going to be gigantic. Problem with them getting so tall is makes it easier for the wind to blow over.
Anyways, I don't really get why this part of the plant is just growing one or two big pitchers instead of alot of normal pitchers, but it's kind of cool.
I'll post more pitchers once it opens.