Fig. 5. Dormant seeds remaining after a 28 d germination test for seed retrieved at 3, 6, 9, and 12 mo after planting of 50 eastern gamagrass seeds at various dates. Seed was either wet stratified at 4°C for 6 wk or unstratified before planting. Letters indicate statistical significance for the main effects of retrieval date. The number of viable seeds from retrieval dates with the same letter did not differ at P 0.05 according to Tukey's test. When interactions of stratification treatment with retrieval date were significant, significance of stratification treatment at each retrieval date was determined with Tukey's test. *, **, *** indicate differences between stratification treatments for a retrieval date at P 0.05, 0.01, and 0.001 levels, respectively. Separate lines for stratified and unstratified seed with no denotation of significance for individual retrieval dates represents significant (P 0.05) main effects of stratification treatment. A single line for a planting date indicates that stratification treatment and interactions of stratification with retrieval date were not significant.