Mari Masot two-part pots are thrown from a sandy-textured, high grog stoneware that remains slightly porous after firing. I recommend using these pots as decorative objects, but they are also usable as plant pots. If you use your two-part pot for plants, the surface of your pot could develop a patina - which has its own very organic beauty, but is something to keep in mind. If you don't like the idea of the patina, I recommend using a small plastic-like compostable bag to line the pot - with a hole at the bottom for drainage, of course.
When it's time to water the plant, carry the top part to a sink or other area where it can drain free, and let the water run out before replacing it on the base. The base of the two-part plant pot is designed to catch a few drips, but not to hold a lot of water - it could leach out. For this reason, I don't recommend using your two-part plant pot as a vase.
Cleaning the pot is most easily done by simply holding it under running water.