The growth of P. helferi was studied using the DFT involving nutrient solutions at five different EC levels from 0.4 mS/cm to 2.0 mS/cm. It was found that the differing EC levels significantly affected the height and shoot number of P. helferi but did not significantly affect the diameter of the shrubs ( Table 6). The specimens of P. helferi cultured at EC levels of 1.6 mS/cm had the greatest growth with respect to their height with a significant increase in the number of shoots ( Table 6). After 6 wk, the specimens of P. helferi cultivated at the EC level of 1.6 mS/cm began to grow better than those under the other treatments. The height increased to be 7.47 ± 0.44 cm taller than the plants of other treatments experiment which was significant until the experiment was terminated at 10 wk.