Arrow roots are complicated in that they require moist, marshy ground throughout the year to grow well.

Unfortunately this conditions can't be found in large scale farms even if one wanted to create them he would need large volumes of irrigation water throughout the year thus it is difficult to find large scale farming of the crop.

Furthermore the cost of irrigation will outstrip the value of the crop

Small farmers are the ones who grow the crop along river banks and marshy areas-areas that a rare considering we have cut most of the trees in the country.
see www.journalofkenyanhorticulture.blogspot.com