FlytrapCare Carnivorous Plant Forums

I bought it from online store and edges of leaves is turning yellow. Why?

Way too little info to speculate.
When did you get it?
What's is planted in?
Did you plant it or did it come potted?
What water are you using?
Where is it kept? Windowsill or outside?
What part of the world are you in?
With the answers to those questions, we can start making educated guesses as to possible causes.
That being said, I can see one issue. It appears to be planted too deep in the media, which will slowly choke it out.

ı get it one week ago
ı am watering with pure water
ı kept it in my mini greenhouse in my room
ı use artidical light

also ı can see some leaves are broken when it was shipping.

I see what looks like roots on the surface of the growing mix. Did it come already planted in the pot?

Was it jumbled up in the box…dirt scattered, plant laying loose, etc?

By “pure” water is that distilled, reverse osmosis, spring water, tap water, or something else?

Is your greenhouse well ventilated?

ı planted
It came in safe place
ı bought pure water from a medical factory
my greenhouse lid is always open

You planted. What are the light brown string-looking things on the surface? If they are roots they need to be under the soil.
It was not jumbled up with dirt scattered.
By pure water do you mean distilled? What is medical factory's description of it?
Good that the greenhouse lid is always open.

What grow mix did you use to plant it in? Flytrap cannot live with any type of fertilizer. No fertilizer. No regular potting soil.

Can you get a picture of terrarium and light that you are using?

The plant looks good other than lightening (yellowing?) of edges of petioles.

Raise plant up so where leaves grow out roots is exposed to light...not much but a little bit more than they are now. Chef is right...it's planted too deep.

Is your location in Turkey?