The Vine Cross is known in heraldry as a Foliated Cross or erroneously, an Ivy Cross. Curiously, it is not a common Christian symbol. I was not able to find any information on this cross in front of the church at Rilly-sur-Loire (below).
La Croix feuilles de vigne n’est pas semble-t-il un symbole chrétien répandu. Je n’ai pas réussi à trouver des informations concernant cette croix devant l’église de Rilly-sur-Loire (voir ci-dessous).
To my eyes, quite unusual.
I think they appear here a lot as a response to the phylloxera crisis. A few of them have inscriptions along the lines of ‘Oh Lord, deliver us from this plague’. And of course, vines => wine => blood of Christ.
Ah, thank you.