[0006] The disadvantages of the apparatus are: (a) it cannot work on a houseplant in its existing pot and decorative container, (b) the single manufacturer makes only few styles of self watering plant containers, which are not decoratively attractive, (c) the transportation cost for the bulky containers is high, (d) it requires the reporting of the houseplant with a special mix of soils to conduct water, (e) the buried soil moisture sensor can be fouled by bacterial growth, (f) the water holes at the bottom may be interfered by the root growth, (g) it is difficult to maintain the moisture sensor and water holes underneath the soil, (h) watering occurs during the period of water refilling regardless of the need, (i) the maximum length of time for unattended use is only one month.