Is Agastache black adder hardy?
Is Agastache black adder hardy? This giant hyssop is quite hardy, tolerating winter temperatures down to around -10°C in a sunny, sheltered position with free-draining soil. In areas with fairly mild winters, Agastache ‘Blackadder’ will grow back bigger and bushier each year! The most popular Agastache is anise hyssop (Agastache foeniculum). The true species has […]
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