Can someone please provide me with information on how to get Nepenthes Bicalcarata and Truncata to multiply faster in tissue culture. I'm just a tissue culture hobbyist and have no formal schooling in the hobby. I have been TC-ing Nepenthes for 3 years now and i can get most of them to multiply and divide very well except my Nepenthes Bicalcarata and Truncata. They seems to simply survive. I use 1/3 ms and 1000mg powdered charcoal and gelzan ph 5.6. Per litter. Can you please give me some advice. They are in the exact same conditions as all of my other lowland to intermediate Nepenthes. This is an intermediate plant so i don't understand why the slow growth. Thanks for any help in advance i do appreciate any suggestions you have.