Left: hand 扌, right: seedling 苗 (= This plant [still as small] as grass 艹 on the field 田)
Mnemonic
(A field with seedlings planted neatly in rows looks beautiful:) If the hand arranges the plants/seedling 艹 in the field (in such rows), it looks like being depicted.
The app has many other functions, such as character selection according to difficulty, practice programs, handwriting recognition and success statistics!