1. Ando T, Tatsuzawa F, Saito N, Takahashi M, Tsunashima Y, Numajiri H, Watanabe H, Kokubun H, Hara R, Seki H, Hashimoto G (2000) Differences in the floral anthocyanin content of red petunias and Petunia exserta. Phytochemistry 54(5):495–501
2. Ando T, Takahashi M, Nakajima T, Toya Y, Watanabe H, Kokubun H, Tatsuzawa F (2004) Delphinidin accumulation is associated with abnormal flower development in petunias. Phytochemistry 65(15):2219–2227
3. Bloor SJ, Bradley JM, Lewis DH, Davies KM (1998) Identification of flavonol and anthocyanin metabolites in leaves of petunia Mitchell and its LC transgenic. Phytochemistry 49(5):1427–1430
4. Boatright J, Negre F, Chen X, Kish CM, Wood B, Peel G, Orlova I, Gang D, Rhodes D, Dudareva N (2004) Understanding in vivo benzenoid metabolism in petunia petal tissue. Plant Physiol 135(4):1993–2011
5. Brown D (2009) Growing petunias. University of Minnesota Extension Office. University of Minnesota.
http://www.extension.umn.edu/distribution/horticulture/DG1120.htm