The site on Ballam Road has secured more than £20,000 of funding from the Heritage Trust North West (HTNW) to help restore the park.
Chief executive officer of HTNW John Miller said: “This project will increase public access to this beautiful and historic park. It will also provide visitors with information that will highlight its historical importance.
“This green space is a real gem and this work will open it up so it can be enjoyed all year round. We cannot wait to see the work start.”
Plans include a water feature and habitat in South Park, improved pathways, tree planting and a focus on the restoration of The Mount, a picturesque man-made hill built in the 17th Century.
McNabb Laurie, executive director of funders The Veolia Environmental Trust, added: “The Trust supports community and environmental projects across the UK, and helping schemes that improve public spaces for all to enjoy is one of our priorities.
“This scheme will restore and open up a valuable landscape and it is good to hear that volunteers will be getting involved. I look forward to hearing about its progress.”
South Park was originally part of the South Prospect Garden and it was landscaped in the romantic style of the 17th and 18th Centuries.
The 78-acre grounds require a great deal of maintenance.
The work is part of a larger scheme to renovate the park with the aim of increasing access for everyone, including people with disabilities, and to provide volunteering opportunities for people of all ages.
Volunteers will be involved in clearance works and planting under the supervision of a landscape gardener, a volunteer training co-ordinator and members of the Lancashire Gardens Trust.
HTNW agreed on the proposed work at an open day held at the hall in 2011.
More than 70 per cent of attendees expressed their support for restoring the garden and making improvements to the country park.