Varies by type. There are dwarf varieties 6 to 12 inches tall and wide, and others grow up to 4 feet tall and 1 to 2 feet wide. Late spring until first frost, but may show a slow-down in blooming at the peak of heat in summer. Flowers bloom in shades of orange, pink, purple, red, white and yellow and there are also bi-color and tri-color varieties.
Leaves are pale to mid-green. Zinnias come in a wide variety of flower shapes with stars, daisies, dahlias, spiders, buttons, domes, and quill-leaf cactus shapes.
Within those shapes, there are also singles, semi-doubles and doubles. As long as there is no further threat of frost, zinnias can be planted any time through the end of June.
Locate your zinnias in an area that will get at least 6 hours of sun each day and where there is well-draining soil. Zinnias are best started from seed and can be sown directly in the garden after the threat of frost has passed. Thin the seedlings to spacing of 6 to 18 inches depending on variety by snipping at the soil line with scissors. Tip: Pulling out seedlings can disturb the roots of those left behind. Add compost to the area where zinnias will be planted to enrich the soil.
Water regularly, for a total of about 1 inch per week. Although they can tolerate dry conditions, they will do much better with consistent moisture in the soil. Keep excess moisture away from the foliage by watering at the base of the plant; this will help keep your plant healthy and prevent disease. Seeds are easy to save by letting the flowers dry completely on the stem.
Fill it with lukewarm but not cold water and mix in a floral preservative. If you prefer, you can make your own by blending together 1 tablespoon of sugar, 2 tablespoons of lemon juice and 2 teaspoons of bleach.
Make sure it's well-blended before adding it to the water, and then mix well once you pour it into the water. Add and arrange your zinnias. Once you have your zinnias arranged to your liking, set the vase out of direct sunlight or the airflow of air vents, windows and doors.
The cooler the room, the longer the flowers will last. Also, avoid setting your zinnias near fruits and vegetables that release ethylene gas, which will cause the flowers to wilt sooner. Check the water level frequently, as the zinnias will likely drink a lot in the first few days.
To promote long zinnia vase life, change the water every two to three days. When doing so, check the vase for any bacteria growth and remove it. They need to be cut after the flower has opened, but before the back petals start to dry. I still cut the buds for design work, though. Laceflowers must be cut fully open, after they have transformed from a cup-shape to a soft dome. If cut too early, they droop quickly. Zinnias should be given the pre-cut "wiggle test.
If the flower head bobbles, it isn't ready to be harvested yet. For a quick guide to optimal harvest times for many varieties of cut flowers, click here and scroll to page 2.
Next, each variety should be provided with the nutrients that it requires. Some plants need help to absorb the water you put them in. They can also be treated with a pre-hydration solution like Easy Dip or Quick Dip to aid water absorption. Other flowers yarrow, rudbeckia, zinnia are considered "dirty flowers" because they seem to dirty up the water quickly. These flowers need an extra solution or a little chlorine tablet to help limit bacteria growth and improve water clarity.
Foral hydration products are important for helping flowers like dahlias look their best and last longer. This article from the University of Massachusetts, Amherst Extension is an especially nice guide to pre- and post harvest care for cut flowers. It goes into much greater detail about the ideas I'm sharing in this post. Then, flowers need time to rest before they are used for design work.
This stage is called conditioning. A minimum of a few hours should be provided. I prefer to use flowers that have rested overnight. Category: home and garden landscaping. Many varieties of zinnias will last from seven to 12 days in a vase. Zinnias are the workhorse of the farmer's market, too. Flower farmers will attest that zinnias with their brilliant colors, easy care and long vase life are one of the most profitable flowers to grow.
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