Java Fern (Microsorum pteropus) can be grown very easily on a driftwood. This is one of the least demanding plants used in a planted aquarium. This is a low-light plant. Under intense light, the leaves tend to "burn" and develop large black areas around the edges.
If you have Java ferns in your tank, put a net around the inlet of your filter and it check regularly. You will find tiny Java ferns are stuck on the net. Keep them in a bowl or a jar beside your mail tank. Change the water as needed. Drop a dose once in while or when dosing your main tank. Within few weeks you will have enough to exchange or even sale.