Water quality can have a significant impact on the vase life of cut flowers. The effects of vase solution pH
and electrical conductivity (EC) on the vase life and postharvest characteristics of Dendranthema L. ‘Naru
Lavender’, Dianthus L. ‘Burgundy Sangria’, Helianthus L. ‘Sunbright’, and Zinnia L. ‘Benary’s Giant Scarlet’
were investigated. Vase life of Dendranthema increased to 14.6 d in acidic solutions from 6.1 d for distilled
water. Solution uptake of cut Dendranthema was also greater in acidic solutions (94 mL) compared to
distilled water (76 mL). There was no significant difference in vase life of Dendranthema when solution
EC ranged from 0.50 dS m−1 (21.7 d) to 4.00 dS m−1 (19.3 d) of NaCl; however, all solutions with NaCl
resulted in a longer vase life than distilled water. For Dianthus the use of buffers to alter pH reduced vase
life from 24.4 d for the non-buffered control to 19.9 d for the citrate buffered solutions, but no effect of
actual pH was noted. Additionally, increasing the EC from 0.00 to 4.00 dS m−1 decreased vase life by 10 d.
Cut Zinnia stems were notinfluenced by solution pH, but as EC increased from 0.00 to 4.00 dS m−1 vase life
decreased from 10.6 to 6.8 d. Helianthus vase life was not affected by EC, but decreasing pH increased vase
life by 1.1 d when stems were held in acidic solutions compared to basic solutions. The use of commercial
holding solution reduced the negative effects of high EC on salt-sensitive Dendranthema, Dianthus, and
Zinnia and increased solution uptake. For Dendranthema vase life was 24.6 d when held in preservative at
an EC of 2.50 dS m−1, while it was reduced to 17.4 d without preservative at the same EC. For Helianthus,
solutions with preservative had a solution uptake 10 mL greater than solutions without preservative. In
general, stems with longer vase lives also had a high incidence of necrotic leaves and petals, petal wilt
and bent neck. In conclusion, each species had unique reactions to the vase solution treatments, but the
general effects were consistent: high solution pH or EC or the use of buffers either had no effect or reduced
vase life and the use of floral preservatives increased vase life