They come from across the planet and meet in the shadow of Israel's 12m concrete wall. They strap olive saplings and water bottles to the back of a donkey, silent under its burden. Former police officers from Sweden, German punks, Australian conservationists, leftist activists from the US, South African priests, and a Celtic fringe of Welsh students join Israeli anarchists and Palestinian pacifists.

These are the guerilla gardeners of the occupied West Bank.

And it's a growing movement, with more than 120 international volunteers arriving in Bethlehem governorate alone to assist with this year's harvest.