Can Venus flytraps really catch insects, and are they suitable for growing indoors?
Speaking of the Venus flytrap, plenty of people are probably like me - the first time you see one, it feels novel - this thing looks like a little pair of tongs, can it really catch insects? And is it reliable to keep one indoors?
When a Venus flytrap catches insects, that is no bluff - it genuinely has this ability. Look at its leaves: the two lobes at the tip join together, and the edges carry a ring of small spines, just like a mini bear trap. On the inside of this trap there are several thin “trigger hairs,” and these are the key. If an insect foolishly crawls in and touches one trigger hair, the Venus flytrap may not react yet; but if within 20 seconds it touches two in a row, or one hair is touched twice, then bam, the trap snaps shut, and the small spines at the edges interlock, as if putting a lock on the insect.
Do not think that is all - it is also quite clever. If what it catches is something inedible like a pebble or a dead twig, after a few days of feeling no movement it will slowly loosen, saving itself the wasted effort. But if it has caught something alive like a fly or mosquito, the insect will surely struggle, and the more it moves, the more often the trigger hairs are touched, and the tighter the trap closes, until finally it can hold the insect firmly. Then the inner side of the trap secretes digestive fluid, slowly absorbing the insect's nutrients; after about ten days or so, once digestion is done, the trap opens again and waits for the next meal to come along.
As for growing it indoors, it actually can be grown, but it has to be cared for properly. Its native home is the wetlands of North America, where there is plenty of light, high humidity, and the soil is especially “plain” - all peat and sand, with not a bit of fertilizer. So when we put it indoors, first we have to find a spot with good light, such as a south-facing windowsill, where it gets at least four or five hours of sun a day; otherwise the leaves tend to droop, and the traps have no strength to catch insects.
Watering also has its rules: do not water it directly with tap water, because the minerals in it are bad for the plant; rainwater or purified water that has been left to sit for a few days is best. And the soil must be kept constantly moist, not dried out completely, but also not waterlogged, otherwise the roots rot easily. If the room is too dry, such as when the air conditioning is on, you can put a tray of water under the pot, place a few stones in the tray, and set the pot on the stones; as the water evaporates it raises the humidity around it, and this trick works quite well.
One more thing: do not always give in to the urge to touch its traps. Some people find it fun and keep poking with their hands to make the traps close, but this is no good. Every time it closes and then opens it takes a lot of effort, and being messed with like this all the time, the Venus flytrap tires easily, gradually stops growing well, and the traps may even be ruined. As for feeding, there is actually no need to feed it specially; the occasional small insect flying by indoors is enough for it to eat. If you really want to feed it, just toss in a small ant or small mosquito; do not feed anything too big, because it cannot digest it.
Overall, the Venus flytrap's insect-catching is a real skill, and keeping one indoors is no problem either - you just have to follow its temperament: give it enough light, keep it moist, and do not mess with it. Keep one on the windowsill, and it works both as a small potted plant to look at and as a helper to catch little flying insects; it is quite interesting, and friends who are interested really can give it a try.