Usage of leek or buckwheat

Almost never use these to crops. Can you give a good example of leek or buckweat usage.
Is leek like gabbage but better or worse?

Yes, leek is similar to cabbage. You get more of them per field, but they don’t keep quite as long as cabbage.

Buckwheat is used for weed suppression in your fields and also provides you with grain for making flour for bread.

Buckwheat also affects Fertility much less than Wheat (Buckwheat = - 2, Wheat = - 6!), but doesn’t give as much Grain per field as Wheat. I use it exclusively when I’m starting fields and want to improve fertility fast: once fertility is where I want it, I switch out Buckwheat for higher-yielding Wheat.
The game counts both as generic ‘grain’ so uses them interchangeably for bread or cattle feed.

I find a field (one cleared of weeds and rocks, and appropriately sanded) set to clover + buckwheat; clover + buckwheat; clover + rye for the three years is a great balance between grain production, fertility impact, disease resistance, and farmhand maintenance (i.e. none!).

Three such fields, alternating the rye cycle, each sized 5 by 12 with 4 workers, gives a very steady production of grain with very little player management.

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This was close to my solution, too, until 0.9 playtest, when I discovered that the same size field panted in Wheat gave substantially more Grain than Buckwheat did. That’s what changed my planning to switch out Buckwheat for Wheat once I had gotten the overall Fertility of the field over 90%. A field with 2 - 3 rotations of Clover, 1 of Wheat, 1 of Beans/Peas and 1 of Root Veggies or Greens maintains the fertility handily and rotating through three such fields gives me a steady supply of everything each year.

I’ve found this to only be necessary so far if you are scratching at 1000 population AND have 6 or more upgraded Barns - those cows can go through a lot of your grain every year!