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PENSTEMON palmeri
Palmer's Penstemon

Type (Foliage/Class) Shrub
Height 4' to 6'
USDA Zone(s) 9
Sun Exposure Full Sun to Partial Shade
Cold Hardiness 1°f
Bloom Color White to soft Pink-Lavender


Pictures (Click to enlarge)

Plant Hardiness (Zone information)
What are zones, what zone do I live in and why does it matter?

In the botanical realm there are many zone maps that assist us with determining whether a plant will survive where we live. Through gathered information it has been determined in which areas a certain plant should grow.

LandscapeMart is based in Phoenix, Arizona. There are several different zone maps that are used here. These include:
blackdot USDA (United States Department of Agriculture's) Plant Hardiness Zones
greydot This system is based on the cold hardiness of each plant and divides the entire country into 11 zones. Phoenix is in zone 9.
greydot Plants listed with zones 5-9 mean that they should grow in zones 5 through 9.
blackdot Sunset Climate Zones
greydot This system covers the 13 Western States and is broken into 24 zones. Phoenix is in zone 13.
blackdot Plants for Dry Climates Climate Zones
greydot This system is developed for Arizona which is broken into 3 zones. Phoenix is in the low zone.

LandscapeMart uses the USDA Plant Hardiness Zone Map since it covers the entire United States. This allows us to expand our plant catalog to cover the entire country.

Note that some plants that are listed for zone 9 may not actually grow in Phoenix due to our summertime heat. The AHS (American Horticulture Society) has developed a plant heat zone map based on the average number of days above 86 (30C) which is the temperature in which plants begin suffering physiological damage from heat. Phoenix is zone 11.
blackdot A plant may have the numbers 5-10, 7-3. With this number range the plant will survive the winter cold in zones 5 through 10 and the summer heat of zones 7 through 3. This plant should not live year round in Phoenix due to our summer heat.

Plants may grow outside of the zones listed. Microclimates can extend the plant's adaptability and allow it to florish in an area where it normally isn't found. It is best to contact a local nursery or landscape professional to verify how a particular plant will grow in your area.
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