Weed
Ricinus communis has been referred to as an invasive or weedy species in many countries, particularly in the tropics. Dense thickets of castor plants shade out native flora and may be detrimental to biodiversity. Because of its high invasive potential, its use as a bioenergy crop has been rejected in the USA and Caribbean (Bridgemohan et al., 2014; Gordon et al., 2011).
Land use competition
Ricinus communis is able to grow on marginal land where no other crop can be cultivated and does not compete with food crops for land use (Kemayo Farms, 2019).
Organic soil fertilizer and bioremediation
The castor plant was grown successfully on cadmium-contaminated sites. It could help stabilize 51% Cd in their roots, stems and leaves and was recommended for soil remediation (Bauddh et al., 2015).