How to improve soil quality in pots?
Add humus: the fastest way to improve soil health is to add humus. Humus is the dark organic matter in soil that is formed by the decomposition of plant and animal matter. It is rich in nutrients and retains moisture in the soil. Add organic matter. Organic matter is the single most important ingredient to improving any soil. It can make heavy clay soil drain better, easier to dig and not so hard or sticky. It can also help sandy soil hold together better and retain more moisture and nutrients.
How to keep potted plants well drained?
Insert a drainage layer. Add stones, pebbles, pumice, or activated charcoal to the bottom of the decorative pot before adding soil. This will enable any excess water to escape the soil and the roots to avoid damaging them. Avoid using gravel in the bottom of the pot as these can actually block the drainage holes and hold moisture above the gravel. Add a tray large enough to catch any water that drains for indoor plants (this keeps your carpet/floor cleaner).