MADISON, Wis. — Here are a few flowers that tolerate cooler temperatures and light frosts. They can be transplanted in early spring (whenever that may be in Wisconsin).
Pansies (Viola x wittrockiana) always seem to be described as flowers that will make you smile. I guess it’s because they come in so many festive colors. Not a fan of summer heat, pansies prefer cooler temperatures. They can tolerate frost and have been known to readily survive a late-season snowstorm. Pansies prefer moist, well-drained soils. Plant in a sunny or partially shaded location. The flowers are edible, and their petals are often used to color butter or to decorate cakes and pies.
One of my favorite flowers of all time are snapdragons (Antirrhinum majus). Sun-lovers, they come in a wide array of colors and sizes. Varieties range from only six inches high to almost three feet tall. Grown as an annual in Wisconsin, they are considered easy to grow and offer a long bloom time (though they may wane during the hot summer months). A great flower to plant for children as they love opening the “jaw of the dragon” and letting it snap shut. Snapdragons make a nice addition to a cutting garden as they look great in bouquets.
Alyssum (Lobularia maritima) is reported to tolerate temperatures down to 28ºF. Commonly found sporting white flowers, varieties of pink, lavender and blue can also be found. Alyssums are low-growing plants that work well in garden borders though some cultivars have a trailing habit that would work in a hanging basket. They prefer a sunny or partially shaded spot.
For an annual with interesting foliage, consider planting the Bells-of Ireland (Molucella laevis). The stems are thickly covered with bell-shaped structures called calyxes. Within the calyxes bloom petite, white flowers resembling the clappers of a bell. They can be planted outdoors once nighttime temperatures are above 40ºF. They favor moist soils, and full sun though will manage fine in part shade. Keep in mind they often self-seed in the garden if flower stalks are left on the plants until dried. Blooming stems make an excellent addition to dried or fresh cut flower arrangements.
–Margaret Murphy, University of Wisconsin-Madison
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