The order had once started an Alliance with an alien race from a planet far away from our solar system. They had visited Earth recently and they found that the plants from planet Earth allowed them to create a special kind of fuel that was ideal for their technology. The only reason why the order stopped allowing for plants to be taken from Earth, was because this was not the optimal way for fuel to be created, and humans would ruin Earth in a matter of years if they learned to create vehicles that could run with plant fuel.
The alien species that are now banned from exporting plants from Earth has requested seeds to grow their own, but apparently their habitat is not suitable for our plants to grow. They are now enemies of humanity and enemies of the order, but they know better than to mess with the order, so they have kept their distance for now.