Ayame's Created Jutsu, Goes under Third Chart

Naraku no Hana (Hell's flower)
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Type: Ninjutsu
Chakra: 25000
Description: The user of the technique mus be able to use plant element manipulation (mix of earth and water), Earth type, and Water type. The technique is almost exclusive to the Hana Ouji clan because of rapid growth of a certain type of plant necessary to use the technique.
First, a specific species of insect eating plant is put in the ground and grown until it is large enough to easily swallow a person. This is only in theory because the acid does not increase potency and the stem and plant tissue does not get any stronger. This technique mixes rock(Earth Chakra) with plant chakra to make a completely new element.
The plant's head is surrounded by a thick layer of the Rock/Plant mix to give it crushing power to compensate for the weak acid, sharp thorns are grown form the stem, very thin, rigid root hairs poke out of the ground around it, and rock/plant fangs (1-2 inches long) come out of the "mouth" of the man-eating plant. Finally, a vine tongue made of only plant chakra comes from the mouth.

Diagram Below:

First of all let me clear something up about the third chart: Its personal. In such no one else may use it, unless of course they copy, and I dont mean sharingan, you.

Now onto the jutsu. First of all no chakra requirement isnt going to work. While your character may already be able to use it, this number also gives people an idea of the level of the jutsu, so you need it.

Next, I just wonder what this will really do. I mean its a giant plant that cant move and looks like it will eat someone. So no one would go near it, plus it seems vulnerable and all that.

It comes from below and snaps shut when it touches their feet. And it's basically made of rock, so I dunno how it's really vulnerable.

Now this is a very important detail: does it move underground or does it simply grow huge when someone walks near it?

She plants it low and it grows out from underground below them. And if it touches their feet, it snaps shut on them. It can't move.