[1][2] Cynog Dafis documented the history of co-operation between the parties leading up to the 1992 general election at which the parties ran joint candidates, in a speech delivered in Welsh entitled 'Plaid Cymru a'r Gwyrddiaid: Tan siafins neu wers ir dyfodol' (English: Plaid Cymru and the Greens: A flash in the pan or a lesson for the future) as the 2005 Welsh Political Archive annual lecture.
[10] Melvin Witherden of the Green Party[11] stood again for the Monmouth constituency at the 1992 general election, receiving 0.8% of the vote.
[5] He had previously stood for the Green party in the Torfaen constituency at the 1987 general election.
[13] Of the 70 Common Ground Alliance candidates, 46 were from Plaid Cymru with the remaining 24 from the Green Party.
It promised improvements to transport in the city, with "20 minute communities", a faster council housing building programme, an Independent chair for the Planning Committee and other measures to make the planning process more independent.
[18] In the election, Common Ground won 17% of votes across the city, coming third behind Labour and the Conservatives.
[14] In 2022, Plaid Cymru and the Wales Green Party, a semi-autonomous[21] component of the Green Party of England and Wales, jointly created the Future Cymru Forum, to focus on developing policy on six economic topics.