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About Balloon Flower

Balloon flower will prosper whether you begin with seeds or plants. Seeds are easy to start, but because plants do not flower well until the second year, you may want to save time by buying container-grown plants.

To start seeds, barely press them into moist seed starting mix, enclose the containers loosely in a plastic bag, and keep them at 60oF and in moderate light. Seedlings should appear in about two weeks and can be shifted to larger containers a few weeks later. In my zone 7 garden, I keep seedlings outdoors in pots through their first winter, then set them out in the garden when they are a year old. Plants need at least 6 weeks at or below 40°F to flower, but flower best with at least 12 weeks at these temperatures.

Balloon flowers develop heavy gnarled storage roots, so it’s easy to move plants if needed. And, should you want to propagate them, simply take a heel cutting in late spring, when the new stems are about 2 to 4 inches long. Gently dig down to where the stem joins the roots, and use a sharp knife to nick off a stem with a 1/2-inch chunk of root. Pot the cutting, keep it constantly moist, and it should quickly take off. I get close to 100 percent success with this method, compared to only about 50 percent survival of tip cuttings dipped in rooting hormone and set to root in a sandy potting medium.

Care and Feeding

To get the most prolific bloom, situate plants in a well-drained site and fertilize them to support strong growth. In my very average clay, I scratch a controlled-release fertilizer into the soil around the plants in spring; in summer I apply a 2-inch-deep organic mulch. In fall after trimming off the dead stems, I add a little more mulch and then put the wire support ring back in place. Plants are a little late to show themselves in spring, so marking their location keeps me from accidentally digging too close to them later on.

Light deadheading helps to extend the bloom time, and in some years the plants inexplicably produce a second flush of flowers in early fall. If you cut flowers to use in bouquets, sear the stem ends the moment you sever them from the mother plant. Otherwise their vase life may be limited to one day.

Balloon flowers make great neighbors to other plants because they don’t spread and only need dividing about once a decade. In sun, I like to flank them with yellow plume celosia or orange Cosmos sulphureus. In large decorative pots, pair dwarf ‘Sentimental Blue’ with red verbenas. In partial shade, use balloon flowers as accent plants placed among foxgloves, hostas, or lamb’s ears.

Allan Armitage, perennials expert at the University of Georgia, suggests teaming plants with tall yarrows such as ‘Coronation Gold’. He also notes that balloon flower is one of the lowest maintenance and most rewarding of perennials. Plant reviews don’t get much better than that. I give it four stars.