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Gardening in the zone

The gardening season is short as the only time when the ground is not frozen is generally from May to October.  It can be very expensive to heat greenhouses, so few operate all winter long.  Annual growers begin production in early March, six to eight weeks before the last frosts.  Nurseries are usually closed in winter and stock is often imported from warmer climates in April.  Summer annuals are widely used and bulbs and tuberous plant such as canna, gladiola, and dahlia are planted in spring then dug up in autumn (to protect them from the cold and kept in frost-free conditions for replanting the following spring).  Indoor plant are popular, but low winter humidity is a problem, so plants suited to dry conditions are successful.  This includes varieties of Dieffenbachia, Monstera, Philodendron, Crassula (C. arborescens), and Ficus benjamina, as well as African violets (Saintpaulia culivars) and begonias.

            Perennials are often overlooked in Zone 3.  Many perennials listed in nursery catalogues as Zone 4 and 5 have never been tried in Zone 3.  This zone is home to many wonderful species—too numerous to list—but it is fair to say that many genera familiar to horticulture have representative species native to Zone 3 and many other non-native varieties will grow here, as well.  For example, species of lily (such as Lilium columbianum), most hostas, and daylilies (Hemerocallis) survive and even flourish in Zone 3.

            The zone is home to highly acclaimed plants such as sought-after delicate orchids like pink and yellow lady slippers, as well as the dainty fairy slipper.

            There are many plants no one has ever attempted to grow here.  It is a horticultural frontier as plants are always being introduced and bred for hardiness.  There will always be new plants that will thrive in Zone 3.