Wait, what? *FaceiPadMini.*
I am an idiot.
(So much so that I had to write up this little clarification at 3:20 AM despite the fact that I have school in a couple of hours.)
Lilith does have control over her ability, it's just that said control is less effective when she's nervous or angry. Usually, this isn't a problem except considering what she was dealing with at the time and the only thing she knows about mandrakes is the very bad things they can do if not treated properly (as one might guess at this point, Lilith has only been used to dealing with "common plants" (someday I'll find out how the Hunter do I describe that term.)) She didn't expect having to deal with something like a mandrake, especially after the fact that she has only heard the negative about them. All she needs to remedy this is to, well, get used to them (and with any other strange and possibly dangerous plants the have in the Gardening Club,) bar her from competitions at that span of time if you like, just let her get used to what she's dealing with and she will be fine.
I apologize for being such a bad writer about this, this is the first RP I've done in a long while and that was a character point that I came up with during writing my recent post. Again, apologies for my bad writerness (if that's even a term.) That is of course, unless this explanation only made Lilith's character worse which in that case, I'll figure out how to properly justify everything. Eventually.
Now will you excuse me, I'll go back to sleep now, don't want my eyes to be bloodshot in the morning.
I cannot believe that I can write a coherent post with three hours of sleep.
EDIT: Great, since I took too long to write this post my body thinks I've woken up. This is only an indicator of only great things to come.