Compton Acres in Poole is decking out a bog garden to attract butterflies, toads and dragonflies.
"This latest additions will provide a more natural contrast to the formal and romantic landscaping of the Italian and Japanese gardens," said gardener Joseph Coogan.
New planting includes reeds and rushes alongside bright primulas. Deciduous azaleas bordering the area will provide a vibrant orange burst of springtime colour.
A nearby Brazilian Gunnera is set to dwarf its surroundings with its magnificent rhubarb-like leaves, capable of growing up to 1.8m wide, said Coogan.
The alterations are being overseen by gardening consultant Peter Thoday, former horticultural director of the Eden Project.