Hallo Davy!
Are you sure that that plant is used to black water?
And that they don´t sell dragonfly larves with the plant? 😉
It´s also very expensive to order plants in Germany which die at once in the tank … so perhaps it could be a chance to get some from France, which love already black water … 😉
The most loss of money for my aquaristic live I´ve had with buying plants which didn´t grow …