Water: Water when the top 25-30% of soil is dry. This plant can be sensitive to tap and is best to water with distilled or reverse osmosis water. You can also use rainwater, making sure it is room temperature.
Feeding: The Venus fly trap is a carnivore and caring for it requires feeding it live flies, mosquitoes, spiders, and gnats. Without feeding it insects the plant may continue to survive, but the will have a harder time thrive. The insects they consume act as a self-fertilizer. Venus Flytraps should be fed approximately every 2-5 weeks. Grasp the insect with tweezers and gently insert it into the trap until it contacts a trigger hair inside the trap.
Can it be fed dead insects? Yes, although it prefers live food. You may have to stimulate the cilia on the leaf to get it to close on dead insects.
The trap is actually a modified leaf and can have as many as eight of them. This leaf/trap consists of two lip-like lobes united by a hinge. Nectar within the trap is the bait that draws an insect in to its death. Once inside, if the insect makes contact with one of the trigger hairs, the trap is sprung: It closes, shutting up the prey inside. The insect is digested via enzymes within 4 to 10 days. After digestion, the jaw reopen.
Avoid using fertilizer. Venus fly trap performs best in soil low in nutrients.
Dormant period: The plant goes through a period of dormancy beginning in fall when sunlight levels decrease. It will lose its leaves and appear to die, but it actually lives on underground through its rhizomes. This is normal and during this time you can make up for the reduction of daylight hours by giving the plant artificial light and cut back on the amount of water you give the plant. Do not need to feed plant during the dormant months.
Soil: Mix horticultural sand with an equal amount of peat moss or half-and-half ratio to one-third sand and two-thirds sphagnum moss.
It's normal for the individual traps to turn black and die. If you notice the whole plant is turning black and dead-looking, it might be one of these issues:
Dormancy. During the coldest, darkest part of the year, it's normal for plants to go dormant. Continue caring for your plant and wait until spring.
Overcrowding. It's possible that your plant has outgrown its container. Repot if necessary.
Too much water. A VFT wants moist soil, but if its roots get too waterlogged, they might start to rot.