The business operates through three trading divisions - 12 garden centres, wholesale nursery and amenity trees - and won the Garden Retail & Garden Industry Award for multiple garden centre retailer of the year this month.
Secretary Michael Perrett said: "This year the company has benefitted from the results of the first phase of an investment project to refurbish and upgrade all of our garden centres. By the end of August 2015 we had completed the refurbishment of nine of our centres, which has already resulted in significant increases in sales and profitability."
Sales in the amenity division fell after the London Olympics project ended at the beginning of 2015. Hillier said it will continue with plans to use technology to help streamline business operations and improve competitiveness.
Perrett added: "The company has continued to benefit from the UK market, where gardening and horticulture are an important leisure activity. This is a key risk going forward should this change. However, the company is renowned for the quality and variety of its products and believes it can maintain and grow its market share going forward."