I had a bit of the same problem this year. Normally I have flowers when the plants are 2' high. Didn't get them this year until 3-4' high'. Had to replant most of them - birds eat them so I put up netting - they grew a bit spindly. Had heaps of rain in March so hit them up with a bit more fertilizer. And the weather changed from day temps of 32-34 to 25-27C. They are now on their way to the moon - first few are 7' high now. I'm picking peas now. I would say I over fertilised them.
Another point - I planted seeds bought on the internet this year. Other years I buy seedlings from Bunnings. Planted (19th April) some Bunnings seedlings at a school project and they are flowering now - plants are only 18-24" tall. Early days yet but I think the seedlings produce more SP than the ones from the seeds I bought.
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