[0007] U.S. Pat. No. 3,758,987 to Crane (1973) reveals a double walled planter that stores water between the walls. U.S. Pat. 4,329,815 to Secrest (1982) reveals another self-controlled watering planter device. Both patents use a soil moisture sensor to let the air pass to the reservoir, which releases water to the planter. They worked on the same principle as U.S. Pat. No. 6,134,833 and suffered the same disadvantages.