Lindgren, D.T.; Schaaf, D. 2004. Influence of seed stratification and seed age on emergence of Penstemon. HortScience. 36(6): 1385-1386.

Lindgren, D.T.; Schaaf, D. 2004. Influence of seed stratification and seed age on emergence of Penstemon. HortScience. 36(6): 1385-1386.

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