That has always been my weak point. I know (barely) not to fertilize
when plants are dormant, but I always stumble when, e.g., to fertilize
my roses after mid-January pruning.

I have two young fruit trees (Plum and Apricot) which are just
shedding their leaves, and two blueberry bushes in large pots, one of
which is confused enough to be blooming and setting fruit.

I also have growing "winter" vegetable crops that, I assume, it's OK
to fertilize: Peas, beets, carrots, green onions, bok choy, stuff like
that.

Is there ONE comprehensive "when to fertilize" rule? Geared to my
mild "Mediterranean" climate -- So. Calif coastal?

TIA

HB