Three part crop rotation , what is the correct way ?

erm i dont think it matters - as long as you dont grow the crop in the same space for 3/4 years - however we all have good intentions in sticking to crop rotation but it doesn't usually happen - for example i have been growing beans in the same place for around 5 years and ive been growing peas in the same place for around 2 years. however i definately wont be growing onions in the same area the following year as i dont want white rot.

i get the jist of what your sayin!

Ahh. that makes sense mum 

What would you do in my shoes ?

2011... plot 1 brassicas, plot 2 onions, plot 3 potatoes.

2012... plot 1 potatoes, plot 2 nothing yet, plot 3 nothing yet.

Was going to plant my onion sets tomorrow in plot 2 but I could plant them in plot 3, however this would mean that the potatoes would always follow the brassicas.