veg plot edging
i have a veggie plot divided into 4 sections. i have paths all around the plots. In order for the soil to stay in place i have used various wooden products.
I need advice on what material i can use to provide a raised edge ( say 3 to 6 inches high) all around the plot. i have tried log roll but that just rots after a while. Is there any type of steel/plastic product that anybody is using that fits the bill.