Growth Tropisms
Gravitropism = bending away from gravity (stems)
bending towards gravity (roots)
• Occur in flower spikes that continue to grow after harvest
(Gladiolus, Snapdragon, Tulip, Kniphofia)
Phototropism = bending towards light
Recommendations:
• Avoid shipping or storage in horizontal position.
• Pulse cut flowers with calcium antagonists or ethylene
inhibitors (STS).