African Violets and Gesneriads: What is the secret with streps, 1 by gessieviolet

gessieviolet wrote:
What is the secret to getting predictable results with streps?

I have a few plants that are growing well (but have babied for almost a year.

Other small plants (from seeds and leaves) are just sitting. Nothing I do seems to move them beyond a few small leaves stage.

Have received many new plants and leaves in trade; what can I do to get somewhat predictable results?

This hastily made photo taken this morning is a sample of the stages of growth I am contending with..