I like to share with all of you an experiment I'm running for the last 4 months.
In this experiment
I had 10 Nepenthes with my normal mix of peat moss and perlite
And 10 Nepenthes plants in peat moss perlite and Osmocote (10 pellets in each pot of 1.5 Liter)
Both groups of plants were the same age and size both of them get the same amount of light humidity Temp. and so on.
You can see the growth in the 2 groups on the photos
First photo 3 plants on the right side are with Osmocote and the 2 plants on the left side without Osmocote .
Second photo the plant on the left side without Osmocote and the one on the right side with Osmocote
The Osmocote plants have at least additin of 50% in growth the leaves are larger and better color and they all have nice size pitchers.