I bought a Tarnok last year... came with 1.5 foot pitchers (2). It was late in the season so it didn't have much time to settle in before dromancy. It came through dormancy just fine... no rot or fungus.. like the rest of my collection.
Now this year it put up 2 tall pitchers (same size as the ones that came on the plant when I bought it). But now all the pitchers (leaves) are just spade shaped... not pitchers at all.
As they grow, the leaf section is nice and wide, growing to a good height... but the pitcher section never fills out and they eventually stall. The small tip which would typically start growing into the pitcher just browns.
-they get direct sun from 10 or so till 5 or so.
-they are in 8 inch deep pots sitting in a couple inches of water
-the pots that they are in are sitting up off the grass by a foot.
-they only get distilled or rain water
-I don't fertilize
-no aphids or other buggies
-the leaves are growing pretty quickly
___as an aside.. I use to have the pots directly on a cement slab all day in the sun... so I was told to move them off the slab to not get the browning rims of my pitchers... as you can see in the photo.. the 2 formed pitchers got toasted during those times. All the other growth on my other plants since the move have not been browned at all. All the spade leaves on the tarnok were grown after the move as well.