On 1 Dec, 21:20, Rob G wrote:

This is obviously desirable but is such a close spacing going to be as
productive ?

I don't see why not. My old dad used to grow two rows of what it
amused him to call "sparrowgrass", with the plants 9 inches to a foot
apart. He used to plant things in dead straight rows, which may
merely reflect his spell in the forces during WW2. Straight lines
were everything. He had a "barrow-way" between the plants, a row of
planks. In the years it got bushy he would clip the tops, having once
been told that plants should never touch each other. I have no idea
why.

I've never grown it, my garden is all wrong for it in so many ways.