red petiole is either S def or strain related. my MTF have them but are healthy. If the leaf veins also start to show reddish, it's DEFINITELY needing some Sulfur.

You could use a HPS400 for the kids. Tehy will thank you.

Everyone, JA's habit of taking pics from the side AND top is a good one to get into for diagnosing problems!!! It makes things SO mcuh easier to see the structure, condition of low leaves, condition of new growth, etc.