Head florist Louise Roots and assistant Peggy Sheehan created the garden on a punt decked with lupins, delphiniums, foxgloves, hydrangea, dahlias and ferns.
"I used a mass of summer flowers and cuttings from the formal gardens," said Roots. "Tall delphinium, peony and alliums create an idyllic summer garden scene gently floating on the moat.
"The fringe brief was quirkiness so we included a table and chairs on the floating punt, which could be viewed from the water's edge. It proved very popular."
The garden, unveiled last week, came down this week and the castle may involve the wider horticultural team for next year's event.