Authors: PARMENTER GA LITTLEJOHN RP

Citation: Ga. Parmenter et Rp. Littlejohn, PLANTING DENSITY EFFECTS ON ROOT YIELD OF PURPLE-CONEFLOWER (ECHINACEA-PURPUREA (L) MOENCH), New Zealand journal of crop and horticultural science, 25(2), 1997, pp. 169-175

Authors: PERRY NB VANKLINK JW BURGESS EJ PARMENTER GA

Citation: Nb. Perry et al., ALKAMIDE LEVELS IN ECHINACEA-PURPUREA - A RAPID ANALYTICAL METHOD REVEALING DIFFERENCES AMONG ROOTS, RHIZOMES, STEMS, LEAVES AND FLOWERS, Planta medica, 63(1), 1997, pp. 58-62

Authors: PARMENTER GA BURTON LC LITTLEJOHN RP

Citation: Ga. Parmenter et al., CHILLING REQUIREMENT OF COMMERCIAL ECHINACEA SEED, New Zealand journal of crop and horticultural science, 24(1), 1996, pp. 109-114