They will help keep the flies down in your home as this is what they feed on and they do not require any other type of plant food. The pot must be permanently stood in a saucer of rain water and never tap water. If it is not possible to collect rain water then bottled water will suffice. R.O. (reverse osmosis) water, used for keeping marine fish and corals, is a perfect alternative to rain water. Darlingtonia don't like being kept in stagnant water so make sure it is refreshed regularly.