Our zones do not always agree but we try to use our own experience as to what can be depended on to return or have known reputable gardens and or horticulturists to reliably grow that plant in zones that are usually colder but sometimes warmer than what other resources have available. Each zone is separated by 10 oF and the map was updated in 2012. And these are averages, here in zone 8B ('A' represents the colder half of a zone and 'B' represents the warmer half of the zone and they are separated by about 5 oF) we have seen single digits but that is the exception but should be noted by the daring gardener. USDA Cold Hardiness Zones were established to give gardeners, horticulturists, farmers, nurseries, and landscape architects a universal way to describe where a plant will survive with regard to average winter lows for a region. Under poor growing conditions plants may be slightly to significantly smaller, whereas excellent growing conditions can produce larger more vigorous plants. Parentheses are used to indicate that the plant can potentially reach that dimension, although the sizes outside of the parentheses tend to be more typical. Feet are represented by a single quote and inches by a double quote. This is the average expected mature height by width in feet or inches. Images courtesy of Ball Horticulture, all rights reserved. An application of fertilizer at this time may also be beneficial in spurring flower production. If your Salvia or Sage starts to look unkempt in mid to late summer consider giving it a light shearing or remove the spent flowering spikes to help promote new growth and flower production. Salvias are considered the #1 plant for Hummingbirds with their tubular flowers designed for pollination by these amazing flyers. In areas that experience hard freezes like zones 7 and 8, plant this Salvia out between early spring to midsummer to help ensure winter survival. Provide a well-drained soil in full to mostly sunny conditions and never keep soggy wet. The dark colored flowers are sure to attract low flying hummingbirds as well as the occassional butterfly and larger bees with its nectar rich flowers. A 5-star performer in Salvia trials at the Chicago Botanic Gardens! Mirageā¢ Cherry Red Salvia, a form of Autumn Sage or Salvia greggii, was selected for its heat and cold tolerance, and exceptional flower power. Its dwarf and compact habit is perfectly suited for use as a low maintenance and forgiving container specimen as well as in hot and sunny garden and landscape settings. Spikes of deep dark red two-lipped tubular flowers are produced from spring to fall atop this dwarf densely branching perennial Salvia.
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