He's surrounding his crop with a 5-foot buffer of sudangrass, a tall-growing cover crop intended to hide the hemp from curious passers-by.

It forms a tall-growing plant, frequently over 12 feet high, producing trusses of purple-coloured flowers in May, relieved by large, light-green, spear-shaped foliage.

There are also dwarf and tall-growing, as well as the precocious and tardy fruiting varieties.