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Joined: Mar 2006
If it's only hardy into Zone 9, your best bets are to either treat it as an annual and grow new plants each year (as with impatiens or zonal geraniums), or to plant it in a pot that you bring indoors each winter. Zone 9 plants can't tolerate temperatures much below freezing (20-30 degrees F), and our Zone 4 winters are way to cold for them to survive outdoors, even with 1-foot of mulch piled on top.
The great thing about gardening is that you always get a chance to start over!