Pretreatments
The tendency for sunflowers to wilt prematurely in the vase can be avoided by pre-treating the flowers (15 to 30 minutes) with clean water containing 0.02% detergent (Tween-20, Triton X-100, dishwashing detergent).
Storage Conditions
Sunflowers can safely be stored at 0-1ºC. Packing Sunflowers are normally packed in standard horizontal flower boxes.