This region is highly urbanized and characterised by highly productive agriculture with extensive grasslands and pastures. The major part of the landscape is fragmented and natural areas are scattered:

o   Grasslands along rivers, in valleys and especially associated with the low coasts (fens, reedbeds, marshes) are characteristic, with decreasing coverage and deteriorating conditions.

o   Some forests with natural species composition still exist, including forest traditionally used e.g. by coppicing.

·        Geomorphology: All coasts are exposed to large tidal movements. The inland landscapes consist of hilly ranges and uplands or of large and relatively flat and low-lying plains. The region also has a history of land reclamation along the low-lying coasts for more than 1000 years.

·        Soils: The substrate of the plains and low-lying hills in the rest of the region are of sedimentary origin (limestone, sandstone, chalk, etc.). On top are considerable deposits of sand, clay, gravel and pebbles. 

·        Flora: Two groups of taxa are particularly characteristic of the region: the heathers (Fam. Ericaceae) and many leguminous plants. The number of indigenous species as well as of endemics is not high, compared to other regions such as the Mediterranean region.

The Atlantic biogeographical region and climate change: It is generally expected that increases in temperature will continue, humidity will remain high and that occurrence of heavy storms and other extreme weather may increase. The high precipitation rates causes leaching of the soils and feeds the bogs and moors, among these specifically the raised bogs. Also the increased incidents of storms and heavy and prolonged rainfalls have caused huge problems of flooding.

·        Nowadays in March : https://waarnemingen.be/soort/info/7258 (Dutch)

·        In Egenhovenbos in 2019 already flowering on 21 February: https://waarnemingen.be/waarneming/view/167791932 (Dutch)

Humboldt is credited with broadening the science from description to explanation in the nineteenth century.(2) Humboldt combines emotion and analysis without mixing them up. He cultivates calculating admiration and admiring calculation. (3)

What if Humboldt were a researcher today, in 2019? He was a marketing genius. A networker who never stopped writing letters. He loved succinct sentences and punchlines. He held lectures for a wide audience. He took a stand on slavery, colonialism and environmental destruction. Today, he would probably tweet – against climate change sceptics and fake news mongers. (4)

References
(1) Wikipedia. Cosmos (Humboldt).

https://en.m.wikipedia.org/wiki/Cosmos_(Humboldt), accessed 2 March 2019.
(2) Mapping the Nation. Alexander von Humboldt: master of infographics.

http://www.mappingthenation.com/blog/alexander-von-humboldt-master-of-infographics/, accessed 2 March 2019.
(3) Humboldt foundation. The Humboldt Code.

https://www.humboldt-foundation.de/web/The-Humboldt-Code.html, accessed 2 March 2019.
(4) Humboldt foundation. Humboldt today.

https://www.humboldt-foundation.de/web/Magazine-Humboldt-Kosmos.html#109, accessed 2 March 2019.
Photo: https://commons.wikimedia.org/wiki/File:Humboldt1805-chimborazo.jpg 

1.      The current agriculture methods (in the neighborhood) of the protected area that cause:

·        Changing of the water level 

·        Water pollution: eutrophication of ground or surface water is the result

·        Grasslands no longer managed like before: extensive grazing of grass pastures and removal of cuttings.

2.      But also entry by humans is a threat: more and more people live in the vicinity of the remaining nature. These people then increasingly want to use nature in their free time: mountain bike, nature trail runs, etc….

So, our business plan here is: 
1) to make better deals with the farmers to reduce the impact of the agriculture methods and 
2) to rise public awareness about the need to protect these areas.

However, our nature reserves are too small and too fragmented. As a result, there are sometimes remaining populations with a weak genetic basis. We need to connect them and to manage the areas well. And – when all the environmental circumstances are favorable – we might consider translocation of some species e.g. Fen orchid (Liparis loeselii). 

Theophrastus did not use special methods other than his observations to do this.
I would say: He certainly can be considered the forerunner of plant physiology.
Ref. Wiikipedia, Geography and NCBI

All of them (exc. 4:  Continuing decline of mature Individuals) are near threatened on the scale of Europe. 
In Belgium one of these plants is considered as 'critically endangered', some are threatened, one is 'not in danger' (3).

According to the information I collected from the internet, the reasons for the decline of these 5 plants is not always quite the same. 

Mostly, it is a combination of factors, in some cases there are other problems (Fraxinus excelsior) to count with. Ash dieback affects ash trees and is caused by the fungus. This disease was first described in Poland in 1992 and has since swept westwards throughout Europe.