Question: What area that abuts the country where the Prunus spinosa leaf much sooner still has some older people who speak West Flemish?

Knowledge 1: Biodiversity
Finally, an introduced species may unintentionally injure a species that depends on the species it replaces. In Belgium, Prunus spinosa from Eastern Europe leafs much sooner than its West European counterparts, disrupting the feeding habits of the Thecla betulae butterfly (which feeds on the leaves). Introducing new species often leaves endemic and other local species unable to compete with the exotic species and unable to survive. The exotic organisms may be predators, parasites, or may simply outcompete indigenous species for nutrients, water and light. [SEP] Knowledge 2: Dutch language
Some Flemish dialects are so distinct that they might be considered as separate language variants, although the strong significance of language in Belgian politics would prevent the government from classifying them as such. West Flemish in particular has sometimes been considered a distinct variety. Dialect borders of these dialects do not correspond to present political boundaries, but reflect older, medieval divisions. The Brabantian dialect group, for instance, also extends to much of the south of the Netherlands, and so does Limburgish. West Flemish is also spoken in Zeelandic Flanders (part of the Dutch province of Zeeland), and by older people in French Flanders (a small area that borders Belgium).
Knowledge 1: Biodiversity
Finally, an introduced species may unintentionally injure a species that depends on the species it replaces. In Belgium, Prunus spinosa from Eastern Europe leafs much sooner than its West European counterparts, disrupting the feeding habits of the Thecla betulae butterfly (which feeds on the leaves). Introducing new species often leaves endemic and other local species unable to compete with the exotic species and unable to survive. The exotic organisms may be predators, parasites, or may simply outcompete indigenous species for nutrients, water and light. [SEP] Knowledge 2: Leterme I Government
The Leterme I Government was the federal government of Belgium from 20 March 2008 to 22 December 2008. It took office when the Flemish Christian democrat Yves Leterme (CD&V) was sworn in as Prime Minister. It followed the Belgian general election of 2007 and comprised five parties: the Dutch-speaking Christian Democratic and Flemish (CD&V), the Dutch-speaking Open Flemish Liberals and Democrats (Open VLD), the French-speaking liberal Reformist Movement (MR), the French-speaking Socialist Party (PS) and the French-speaking Humanist Democratic Centre (CDH).
Knowledge 1: Biodiversity
Finally, an introduced species may unintentionally injure a species that depends on the species it replaces. In Belgium, Prunus spinosa from Eastern Europe leafs much sooner than its West European counterparts, disrupting the feeding habits of the Thecla betulae butterfly (which feeds on the leaves). Introducing new species often leaves endemic and other local species unable to compete with the exotic species and unable to survive. The exotic organisms may be predators, parasites, or may simply outcompete indigenous species for nutrients, water and light. [SEP] Knowledge 2: Province of Brabant
The Province of Brabant (, , ) was a province in Belgium from 1830 to 1995. It was created in 1815 as South Brabant, part of the United Kingdom of the Netherlands. In 1995, it was split into the Dutch-speaking Flemish Brabant, the French-speaking Walloon Brabant and the bilingual Brussels-Capital Region.

Answer: French Flanders