So, you cut your roses, gave them fresh water and a few flower heads have drooped over. Why? This is annoying but not uncommon. Usually this is an air bubble just below the flower head. Somewhere along the line, from flower farm to your table, air got into the stem. The bubble makes the stem weaker and as it gets below the flower head the stem cannot support the weight, thus drooping. This bend does not allow water to easily pass. How do you fix it?
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Prognosis is always best if caught early. Recut the rose and put it in a sink with shallow warm water (est 110 degrees) and submerge the rose completely while straightening out the stem. Leave for 5-10 minutes. As the stem hydrates it will feel stiffer, or turgid. Then shake rose upside down clearing out as much water as possible before vasing in fresh warm water.