Fig. 4. (A) Height of Cuphea plants in 1999 as a function of growing degree days (°C d) accumulated from the time of emergence; values are the mean SD, n = 3. (B) Rate of height increase as a function of days after emergence. Regression lines are shown in B for data during linear growth phase; regression equations followed by a different letter are significantly different at the P < 0.05 level.