Fran Farmer writes:

On 24/06/2015 2:39 PM, Mike Spencer wrote:

Two years now, most broccoli plants have headed out very early, giving
2" to 4" heads. In the past, with same or similar soil and
manure, we've flourishing plants that yield 12" to 14" heads.

Any suggestions to remedy this? Identify the likely cause?

Just harvest the heads when they are ready and leave the stump in the
ground and then keep harvesting as new nubbeny headlets form.

Oh, yes. We do that. But we were looking for a dozen or so big heads
to get the season started, some for the freezer, some for meals
dominated by broccoli (broccoli soup, salad, w/ cheese sauce etc.)

I know a woman who harvested from her broccoli plants for 3 full
years before she had to take them out.

Ah, well, nice but not here. Weather gets too cold by November for the
plants to produce and of course they freeze in the winter at temps
from 0F to sometimes -10F or colder.

--
Mike Spencer Nova Scotia, Canada