Learning a new language is an interesting process. From picking up simple words and phrases to being able to express oneself fluently.
Yet within any language, even one's mother tongue, there are grey areas, a subject in which one finds one more or less completely lack the vocabulary. I imagine that common areas are law/legislative expressions, medicine, natural sciences. For others it might be cooking or the parts of a vehicle, be it a bicycle, car or an air plane.
In Swedish I am getting more conscious of my own grey areas, and challenging them, pushing them back. One such area is plants - I know the most common trees and a few flowers, but nothing like I used to be able to in my childhood, where I could name almost all the plants growing in a field or by the roadside. Even the most common plants I see growing along the road to work are nameless to me in this language - it does not help that alot of them are truly unfamiliar, not growing in any place I lived as a child.
So I started taking photos of them and bringing home to compare with my flora - which luckily is easily sorted by colour, not family of plant.
My grey areas will soon be filled with colourful flowers, a wild field.