We are known on the local cut-flower scene for our near-perfect blossoms and how long they last in the vase. While this may have happened by chance in the beginning of my flower farming career— now days I work pretty hard at making my flowers as gorgeous and long lasting as possible. Certainly being “locally grown” gives my flowers the advantage on vase life over the South American shipped-in flowers (80% of flowers sold in USA by-the-way)– but there are steps I follow to ensure they last as long as possible.
This is a look at our general cut-flower harvesting and conditioning regimen. This is not rocket science–but when followed you will become the rock star among your flower-loving friends.
When to Harvest: The timing of when in its life a flower stem is harvested makes or breaks how beautiful and how long the stem will last. You cannot make a worn-out flower look good or an immature bloom hold its head up in a vase. This is why it is best to learn what stage to harvest the flowers you are growing. To learn more on stage of harvest on some of the flowers we grow and where to make the cut on the plant for more stem growth, click here.
Some examples; zinnias and cockscomb should be fully developed at harvest; once cut, they do not open or develop anymore. On the other hand, sunflowers and snapdragons are harvested when they are just starting to open to prevent any pollination that shortens vase life or pest damage to those delicate petals. Both continue to open beautifully in the bucket indoors, safe from hot sun, wind and pest damage. So, knowing the stage of the flower at harvest time is a really big part of long vase life.
Foliage removal varies from flower-to-flower so it is key to become familiar with the requirements of the flowers you are growing. Leaving too much foliage shortens vase life and causes stress on the stems ability to hydrate–it simply cannot drink enough to keep all that foliage alive.
Conditioning Cut Flowers: Conditioning is what is done to the flower stem after harvest to make it last as long as possible in the vase.
Buckets and Containers: Let’s start with the buckets and containers used during the life of cut flowers, and I’ll cut to the chase: if you aren’t willing to drink water out of whatever you are putting the flowers in, then don’t put cut flowers in it. This step is so underrated. We have a bucket-washing station on our farm and everything is washed after each use. Using containers that have a scummy film, which is not always visible, takes days of vase life off the flowers. Bacteria is present in that scummy film. When you add water and then the debris that comes out of flower stems –bacteria immediately springs into action. When buckets and containers are clean, it delays this cycle. Adding flower conditioning products to the water delays this process even more.
Wash your buckets and containers with any dish-washing liquid, using a little bleach if needed to remove the built-up scum. Containers and frogs can also go in the dishwasher.
Pre-treatments and Cut-Flower Foods: We use several products on our farm at an added expense and trouble. We do it because it makes a difference in the vase life of our flowers. Pre-treatment does not replace fresh cut-flower food. Food is the next step after pre-treatment.
Harvest buckets get a GerbTabs that is a pre-treatment. This chlorine-based tab kills all the bacteria that are a result of the cut stems dumping debris into the water. This debris immediately begins the cycle of bacteria growth. Some flowers are known to dump more debris than others and also are more sensitive to this polluted water. We call this group the dirty dozen. At the top of the list are gerbera daisies, zinnias, marigolds, and dahlias to name just a few. Pre-treating buys extra days of life in a vase. The flowers are treated for at least 4 hours and can sit in this treatment for up to 3 days. For store bought flowers: cut 2” of stems off and place into water with a Gerbtab for the instructed time.
• Quick Dip is another pre-treatment. This ready-to-use liquid opens the waterways in stems of flowers that are clogged for a variety of different reasons. This is most often needed for store-bought flowers that have been shipped dry. There are a few home grown garden flowers that can benefit from this product, among them campanula, feverfew, rudbeckias and hydrangeas. Any flower that is still drooping 4-8 hours after harvesting can benefit from pre-treatment with Quick Dip.
• Fresh Cut-Flower Food is what goes in the final vase after any necessary pre-treatments. Flower food does make a difference. If you have used it with no visible results, chances are good that the stems were clogged from dry shipping. When the stems are clogged, they do not drink and get the benefit of the food. Flower varieties that have gone the dry shipping route are chosen by importing growers because those flowers can survive without water for many days, so we don’t even realize they are not drinking. Flower food provides nutrition to keep flowers colored up and to continue opening, biocide to help prevent bacteria from developing and a ph balancer that helps to prevent air bubbles that causes clogged stems. Homegrown flowers drink lots of water and benefit from having food to live.
• Bulb Fresh Cut-Flower Food is another flower food but is used in flowers that grow from a bulb such as lilies, tulips and dahlias. It does the same job as Fresh Cut-Flower Food with the additional ingredient of a hormone that aids even more in keeping foliage green and buds opening. If a mixed arrangement use bulb food–it cause no harm to non-bulb grown flowers.
Commercial Growers: In place of flower food I use what is called a holding solution during the time flowers are in waiting to go to market and commercial customers. This provides the necessary nutrition, bacteria protection and ph balance in water but yet doesn’t push the buds to open as quickly.
In a nutshell: harvest at the right time, into clean containers, pre-treated where indicated and then use flower food in the vase.
Don’t just grow great flowers; have near perfect blooms that last a long time in a vase.
Lisa Mason Ziegler is a commercial cut-flower farmer in Newport News, Virginia; she lectures and writes about organic and sustainable gardening. You can email Lisa at email@example.com , call her at 757-877-7159 or visit her website www.shoptgw.com .
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