A significance analysis on the statistic association indicated that,there were significant correlations existed between DPs and VGTs(including leaf number, plant height, weeks after sowing and crowndiameter) (P < 0.001). Additionally, the correlation of DP (y) andVGT (x) had been established, the model with the highest AdjustedR Square (R2) and the best-fitting line selected, the results wereshown in Fig. 3. Therefore, the regression equation can be used topredict the DP of E. grandiflorum TDC from VGTs. Among the 4 VGTs,leaf number had the highest R2