I think it depends on how strong your foliar feed is. I just recently got a tub of Epiphytes Delight, and Sheldon (from this forum) uses this feed all the time and told me to half all the recommendations on the tub. I followed the directions for the bimonthly mix, which said to mix 1/2 a tablespoon per gallon of water. So I cut that in half which came to 1/4 a tablespoon per gallon water. So I foliar feed my Nep twice a month with the diluted solution.

Ye, I foliar feed all my plants including my N. Ventricosa every Sunday with a weekly mix of Epiphytes Delight.
So far its pitchers seem to be growing fine.
If you want to make sure this does not happen, then follow the weekly mix but apply it once a month.

Cheers

Sheldon

I don't understand why you bother to fertilize your neps. I have mine in my green house hanging on a wall with a fence. Three out of four of them are at least four feet long and have about twenty five large pitchers. The other one is about two and half feet and has probably ten pitchers. They have never had any feeding folier or otherwise. Just watered with well water. I believe the secret is using a large pot or basket. I planted mine in peat and spagnum mix in two foot long window boxes on four wire hangers making hanging baskets. Remember all plants that vine grow better growing upward. So if you can supply them with a trellis even just a hoop of coat hanger wire or train them up the basket wiresthe plants will appreciate it