The cherry, plum, pear, peach, apricot and nectarine fruit trees restore 47 of the 75 trees known to have been in the Wrest park in the early 20th century.
The 90-acre Grade I registered garden, is being restored and maintained with the aid of 30 volunteers and eight apprentice gardeners.
Wrest Park’s garden team and volunteers used period magazines and searched for original tree labels still on the garden walls to help them restore the original planting and layout.
Keepers Nursery in Kent supplied varieties such as Hales Early, Lord Napier and Josephine de Malines.
Upper Gardens and apprentice manager Corinne Price said:
"Some of the varieties have proved difficult to find in 2012, but we are continuing to contact various nurseries to see if they are still available. We fear some may have been lost altogether."
Trees still needed include Early Ring, Violet Hatie, Late Duke cherry, Elruce nectarine and Souvenir de Congress pear.
The team is also tending 13,000 box plants and 4,000 William of Orange tulips to be planted in the French parterre, which will be opened to visitors next month.
Price said: "A year ago they were instrumental in researching and planting up an orchard of pear trees, which is now thriving."