From a plum garden

I'm at a far far land.
This land, almost at the end of the world.
There is a green green garden,
full of plum trees.
Yellow, green, red, purple, small, large, round, long...
They make plum jam with them.
That's it.
And they eat.
When the winter comes,
they add water to some of it.
It becomes a soupy sweet,
to eat with pastries and pastalike dishes.
And when they pick more when they need,
they exchange them with wheat,
or whatever they need at home.
No money is used in that.
Just the plums and the wheat.