How should foliage with milky stems be treated for conditioning?

Foliage with milky stems, such as certain types of sap-producing plants, should indeed be treated by searing the stems and then submerging them in water. This process is essential because milky sap can block the plant's vascular system, preventing proper water uptake. By searing the stem—usually done by briefly placing it in boiling water or using flame—you effectively seal the cut end of the stem, which helps to minimize the sap's flow and blockage.

After searing, submerging the stem in water ensures that the plant can begin to take up moisture again without the interference of the milky sap. This method promotes better hydration and extends the longevity of the foliage in arrangements. Sealing the stem prevents further sap leakage and allows the foliage to remain fresh for a longer period. This treatment is particularly useful for floral designers working with specific types of foliage that have this characteristic.