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Compost

Darlingtonia's prefer an acidic compost without the addition of any nutrients, a good base compost would consist of 4 parts moss peat to 1 part perlite.  Silver sand can be used instead of perlite, or as an addition to the base mixture to improve drainage. 

Darlingtonia's will grow in a pure moss peat mixture, however with this drainage can become a problem, and the compost can tend to become too waterlogged leading to a sickly and poor plant.  Much better quality plants are obtained if the drainage is improved. 

In many cases it is stated that Darlingtonia's will only thrive if pure spagnum moss is used as the potting medium.  Darlingtonia's will grow in just spagnum moss, however the use of just spagnum moss provides too much drainage with almost no water retention at all.  If this is to be used as a potting medium then a strict watering regime must be maintained to ensure the roots are not allowed to dry out. 

Plastic pots are normally used, varying in size from a 8 cm pot for cuttings to a 12.5 cm for a more mature plant.  Larger containers, such as washing up bowls can be used, with these the plant will spread to fill the bowl in a matter of years and no action is required other than to ensure the compost does not dry out. 

Darlingtonia does not mind being pot bound, indeed it seems to thrive when it is restricted, so don't be afraid to leave the plant well alone, only repotting or dividing when rhizomes start to appear over the side of the pot.