The team at Tatton discovered soldiers who were keen gardeners were encouraged to write each week to the Gardener's Chronicle.
They've created their own WW1 garden to reflect soldiers memories in this centenary year.
Thousands are expected to attend the show which opens today and runs to Sunday.
Thousands flocked to Tatton Park in Cheshire for the annual flower show which started today.
Designers have worked for weeks to get their displays up to standard, and a new theme this year put many of their heads in a spin.
A garden designed by prisoners in Cheshire is going on display at the Tatton Park Royal Horticultural Society show.
The garden, which was created by inmates at Styal Prison, the region's only female prison, is in the running to pick up a prize at the prestigious flower show.Prison officials say the project's helping to turn around the lives of some of the inmates who work on it.
Mel Barham went to find out more:
The RHS Tatton Flower show starts today, running until 22 July. Today's entry is for members only, and it opens to the general public tomorrow. The show features over 30 designer gardens, and another 21 'fun gardens' designed by primary school children.
Organisers insist the wet forecast won't dampen people's spirits.