У фиалки ряд листьев состоит из трех листочков

http://avsa.org/Magazine.html раздел Scrawny Neck в архиве. Это 1-е, что я нашла

Carefully examine one of your plants and try to learn to count these symmetrical rows of leaves as
they radiate from the tiny center leaves.
The fourth or fifth rows of largest leaves are really only providing background. Most serious growers
keep their plants small by breaking off the oldest leaves as a new row forms in the center.

http://www.violetbarn.com/plant_care.html

Except for trailing (and some species) varieties, do not allow extra crowns, or "suckers" to form on violets.  This will only spoil that natural, flat, round appearance of the plant, and prevent it from blooming to its full potential.  Most violets look and bloom best with about 3-4 rows of leaves.  Most other generiads can be grown with multiple crowns and more leaves.