William Sinclair Holdings has increased its shareholding in Freeland, a green waste recycling business, from 50% to 87.5%.
The original Freeland management will retain 12.5%.
Freeland reported profit before tax of approximately £0.49m for the year ended June 30, 2006.
Freeland, originally a 50/50 joint venture between William Sinclair and the founders of the business, provides processed green waste for the horticulture industry, and produces topsoils for the construction and civil engineering industries.
It has recently developed a new technology that recycles green waste that would previously have gone to landfill.
Bernard Burns, chief executive, William Sinclair Holdings plc, said that its packaging will include footprint data this Autumn - a first for the gardening market, he claimed.