Pelargonium odoratissimum
One of the strongest scented pelargoniums. I would say: smells like apples with a slight touch of mint.
Just walk and accidentally touch it with your foot and you will feel the smell of apples immediately.
They say it is edible, as most geraniums, and that people aromatize sugar with the leaves. I haven't tried this. Very easy to grow and lots of small flowers. Good as a hanging plant.
Pelargonium vitifolium
Beautiful plant. You can grow it as a small tree and everybody will tell you: What a nice little tree!
Very nice scent, rose-like I would say. And delicate round umbels of flowers. It can get very big if you do not prune it.
Pelargonium mollicomum
Small, bushy and nice plant. Smells like canned pineapple. Lots of flowers and seeds. Grows many, many tubers underground, so think it twice before planting it in the same pot with another plant, for even if you pull it out it regrows from the tubers. Anyway it doesn't harm the other plant if you leave it there.
Tubers