Seven year rotation

My planting beds divide neatly into seven.

As my allotment gardening experience and my tastes have changed over the years I find now I don't have enough room for my Brassicas, including Swede and Turnip. Once I get my Swedes and Turnips in, there is little room for Cabbages, Romanesque and Kale - all big plants when they get to full size.

I have come up with the following rotation which I hope will keep most soil problems away and let me produce what I need:

1. Potatoes, followed by Green Manure Mustard against eel worm;
2. Onions;
3. Swedes and Turnips (Brassica 1)
4. Peas and Beans;
5. Three Sisters (Sweetcorn, Cherokee Trail of Tears and Squashes/Pumpkins);
6. Cabbages, Romanesque, Kale, Sprouts and Cauliflower
7. Miscellaneous (Beetroot, Carrots, Bulb Fennel, Corgettes, Parsnips, Lettuce etc.)

Any comments/advice?

Does green manure mustard help prevent eel worm?

I have 6 square beds, 3 long beds and a large spare odd shaped bed at the top of my plot, so nothing returns to the same place withing at least 5 years.
And I generally follow the general rotation rules ie. beans following brassicas etc.

Thanks Yorkie.

Mustard: The idea about growing Mustard after Potatoes, not before, is because the gasses given off by brassica actually harden the eel worm cysts (eggs) and prevents them from hatching so it should be after the potato crop, not before.

Having said that, I've never suffered potato eel worm so why worry and as you say - it is a third brassica into the rotation so best avoided. There's seven years between potato crops so any eel worms that do hatch will be long gone by the time the next potato crop comes by.

Three sisters: I find this works well but I use extra canes in among the sweetcorn to give the beans something more to climb up against instead of the sweetcorn and - like you - I place the squashes to the outside and train them through the bed. Works for me and its a good look when it matures.

I must admit I only grow squashes and sweetcorn from the 3 sisters - and plant other beans in the legumes bed with the peas.  Otherwise it all looks good to me!