Initial average height was greatest for baldcypress at 0.7 m, Nuttall oak at 0.51 m, willow oak at 0.40 m, and lowest for bitter pecan at 0.36 m.
Bitter pecan appeared to lose height growth when compared to the height of the initially planted seedlings, 0.36 m at the end of the 1996 season versus the 0.40 m initial height.
In contrast, willow oak, bitter pecan and bald-cypress did not show a significant decline in seedling density.
After 8 growing seasons, average seedling height for Nuttall oak, willow oak, bitter pecan and baldcypress were 2.9 m, 2.7 m, 2.2 m and 2.0 m, respectively (Table 2).
Seedlings of Nuttall oak, willow oak and bitter pecan planted with tree shelters, had mean survival rates double that of those without shelters.
Nearly 48% of the bitter pecan seedlings planted, that were still alive at the time of sampling, were a result of re-sprouting (Table 3).
The largest impact on first-year survival was found with bitter pecan where survival was increased from 7% to 50% during the first year.
The apparent decline in seedling height for bitter pecan protected by tree shelters was because a significant proportion of the bitter pecan seedlings, 48%, were re-sprouts of which many (76%) were in tree shelters.