i would use the NAME THAT PLANT FORUM

I would never use a plant ID ap.

Since they are only about 65% accurate - even the best of them - they are more of a waste of time than a helpful aid. OTOH, the Name That Plant forum averages about 95% accuracy and darn fast as well!!

I couldn't even find an app called Let it Grow.

I have had great success with the Name That Plant forum here, and then googling up images of the suggested IDs. It's a very satisfying feeling!

Do try to get photos of your mystery plant that are:

1) In focus and clear.

2) close-up and pulled back to see the plant's shape, and sharp pictures of various parts of the plant, like leaves, flowers, stems.

Sometimes people post a question where there are three unclear photos of the same specimen from the same angle, and it's impossible to make a good guess.