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