Prince Charles is set to unveil sixty 'coronation meadows' as part of efforts to conserve flower-rich grasslands across the UK. Eleven of the special sites are in Wales.
Most of the meadows can trace an undisturbed history back to before the coronation, some for hundreds of years.
The UK has lost 97% of its wild flower meadows since the 1930s, hitting plant species and the wildlife that relies on them. The project aims to map the pockets of flower-rich meadows that still remain across the country.
Under the plans, the coronation meadow will be a 'donor' site, with hay and seed collected and used to restore or create new meadows nearby.
This process will conserve the local characteristics of grasslands in each area.
The sites in Wales include Cae Blaen-dyffryn in Carmarthenshire where thousands of lesser butterfly-orchids bloom and the New Grove meadows in Monmouthshire where green-winged orchids and waxcap fungi flourish.
Prince Charles at Tata Steel: "It will become one of the most sophisticated blast furnace operations in Europe"
The Prince of Wales will visit Tata Steel's steelworks, meet employees and members of the community, before visiting the Blast Furnace Control Room and unveiling a plaque to commemorate the completion of the new Blast Furnace Number Four.
The Prince said Wales should be unbelievable proud of what has been achieved here.
Prince Charles has a day of engagements in South Wales ahead, with visits to Swansea and Port Talbot planned.
He will first visit Tata Steel to commemorate a new blast furnace before moving onto Swansea's historic market to meet local stall owners.
As part of the Welsh Government's year-long celebrations marking 100 years since the birth of Dylan Thomas, Prince Charles will visit the birthplace of the late poet and meet members of his family.
The Prince of Wales will leave with a rather festive spring in his step - his last engagement is a traditional Plygain carol service at the University of Wales Trinity Saint Davids, of which he is Patron.