Pandan leaf plant is growing very slowly

The local plant sellers are extremely aggressive in marketing the pandan leaf plant.
The plant is also called the basmati rice or biryani rice plant, since the leaves can be added to food to give its unique flavor
Online the plant will cost Rs 300, offline the plant is cheaper since it is supplied in a grow bag.
While the plant has not wilted,it is growing very slowly , few new leaves are growing