how do chap !
i did manage to get potato rows made for the toytrac display, although not great .it looked remakably good when in situ,
i bought some small triangular wooden decrative strips from B & Q (other D I Y stores are available)
cut to the length needed
coated with pva glue & rolled in dried compost
when dry lychen / moss dipped in pva glue & pressed in place along the top of the ridge
place in the field of soil, mine was dried compost & add machinery
just for ease of use for the display , i may well cut a board to field size & glue the soil & potato rows down permanent , so when i want something different in the field ,the potato board can just be lifted from the display