Irises, with their distinct upright petals and elegant form, are a favorite choice for cut flower arrangements. These flowers can be somewhat delicate once removed from their source of growth. Maximizing their vase life requires a few simple steps that address their specific needs for hydration and a clean environment. Following a careful routine from the moment you acquire them can significantly extend the enjoyment of their striking blooms.
Preparing Irises for the Vase
Immediate and correct preparation of the stems is the first step in ensuring your irises can absorb water efficiently. Use a sharp knife or pair of shears to make a fresh cut on the stem ends at a 45-degree angle, which increases the surface area available for water uptake. Making this initial angled cut while the stem is submerged prevents air bubbles from blocking water flow. Before placing the flowers in the vase, remove any foliage that would sit below the waterline. Submerged leaves quickly decompose, creating bacteria that can clog the stems and shorten the flower’s life.
Maintaining Water Quality
Water quality influences the longevity of cut irises, which tend to make the water look cloudy quickly. Change the vase water completely every day or every other day, rather than simply topping it off. During each water change, rinse the vase thoroughly to remove any slimy residue and bacterial film.
Always use a commercial flower food specifically designed for bulb flowers or a universal cut flower preservative, as this provides sugar for energy and a biocide to inhibit microbial growth. If a commercial packet is unavailable, a simple homemade solution can be created using water, a small amount of sugar, and a few drops of household bleach as a disinfectant. Re-cutting about half an inch off the stems each time you change the water will also enhance their ability to take up the fresh solution.
Optimal Placement and Environment
The location of your iris arrangement controls the rate at which the flowers age. Irises retain their freshness longer when kept in a cool environment, ideally with an ambient temperature between 60 and 70 degrees Fahrenheit. Warmer temperatures increase the flower’s metabolic rate, which accelerates wilting. Keep the vase away from direct sunlight, which causes dehydration, and avoid sources of heat, such as radiators, heating vents, or appliances. Ensure the flowers are not near ripening fruits, which release ethylene gas, a natural hormone that speeds up aging and wilting.