Plastic and fiberglass containers are light, inexpensive and easy to clean for reuse. They are not porous. Glazed ceramic, plastic and fiberglass pots will not accumulate salts as quickly or require watering as frequently as unglazed clay. Self-watering containers are available. They have built-in water reservoirs.
Water travels into the potting medium via a wick.
These containers offer the advantage of less frequent watering. However, fertilizer salts are often moved up to the surface with the water, leaving a white toxic crust that must be removed. Other container options include terrariums, bottle gardens and dish gardens. It is even more critical that the potting mix be of good quality. It must be porous, yet able to retain water and nutrients.