A pot with adequate drainage holes is an absolute MUST for anything other than a bog or water plant!!

btw, a layer of pebbles or gravel at the base of the pot does nothing to help drainage. In fact, it slows drainage as water slows when it encounters a different textural level. And it also serves to raise the PWT, making root rots far more likely.

...as gardengal said...Use hole-less pots as a cashe-pots, potting up the plant in plastic pot with drainage hole(s)..when watering, take the inner pot out & let it drain before putting back...otherwise water will gather in-between the rocks, possibly get re-absorbed, and could smell from stagnation...