At the northern tip of Lake superior in the Boreal forest planted firmly in Zone 2b (Canada plant hardiness zone). They won’t tolerate moist soil. There are two types – tender perennials, which are hardy in zones 8-10 and are treated as annuals in colder zones, and also hardy dianthus which can take the cold in zones 3-10. This plant blooms with brilliant sky blue flowers that pop up over hardy silvery leaves. Sow seeds or plants in zones 3 to 9, in mixed beds, borders, or stand-alone drifts. Cranesbill Geranium. Drought Resistant Yellow Perennials Hardy Ice Plant. Before freezing temperatures arrive, its important to know which cold climate plants are tough enough to survive frost. While the plant does shed its leaves for winter, they will make a return in early spring. That means flowering perennials need to thrive in the moist, sunny climate while being hardy enough to survive winter. Thanks to the effect of the Great Lakes, Ontario, Canada gardens experience warm, humid summer weather and cold winters with heavy snowfall. Hardy Ice Plant (Delosperma) have daisylike flowers that bloom in incredibly bright colors like purple and yellow. Some perennials live for a few years while others, like peonies, can live for decades. As mentioned above the 2015 average last frost date for Ontario is May 9th, but below we outline average frost dads for various areas in Ontario: When is the last frost date in my area? Mature plants died in severe winter of 2009, but self-seeds minimally if dead-headed and will replace losses. They are a succulent type perennial that is very hardy. It would make a great companion to a white blooming astilbe or tiarella. Stonecrop – Sedum sp. They bloom 4 to 5 weeks and grow 2 to 6 inches tall. I sit here in Northern Ontario, not Sudbury, not Timmins, nor North Bay – those places are nearly a day away. They prefer full sun and thrive in average well-drained soil. Here are some top picks for the most reliable, cold-hardy perennials that you can count on to take a polar vortex or two in stride and come back strong in the spring. It is also a taller hardy perennial so put it in the middle to back of your perennial flower bed. Cranesbill geranium, or hardy geranium, is a mounding species that thrives in full sun in average, well-drained soil. I find it very stately in the garden. 7. Ligularia is a prized hardy perennial for its large leaves and daisy-like flowers. It grows woody stems that look almost like branches but dies down to the ground in the winter. Stonecrops are great perennials that you really should consider for your garden. They’re so hardy in fact that the leaves will last down to 15 degrees Celsius. Lady’s Mantle (Alchemilla mollis) Z4, a favourite, beautiful chartreuse foliage, water beads collect on the leaves like beads of mercury, forms a nice neat dome-shaped plant. Hardy Hibiscus is a native perennial with HUGE blooms that look tropical even though they’re not. It prefers moist, well drained soil in partial to dappled shade. Canning Perennials also has a great selection of interesting shrubs and long flowering roses. Their hardy roots let them regenerate and return each season. Ligularia, also known as golden groundsel, is hardy to Zone 3 and will establish a well-behaved clump within a couple years. Even though I am in zone 7b, my annual dianthus will still grow well for me after a cold winter, and is a very pretty addition that gives color in early spring. Low growing perennials like the Heart-Leaf Brunnera thrive in partial shade. Canning Perennials offers over 1500 varieties of hardy perennials, ornamental grasses, ferns, groundcovers and vines including Clematis. Goutweeed (Aegopodium) Z3 - although it is an attractive groundcover, it is very invasive, I avoid it. Read our complete growing guide here. 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