Idaho is a combination of USDA winter hardiness zones 4 through 6 . The average lower limit yearly temperature is -30 degrees F in zona 4 , and -10 degrees F in zona 6 . Temperature ranges from -60 to 118 degrees F in the line of a class . Excessive hot magic spell do not usually last more than a week . Lush , green areas receive over 60 inch of rain and the southwestern vale receive less than 10 inch a year . The growing time of year is the longest around Lewiston , with 200 frost - free days .

Obedient Plant

Obedient plant ( Physostegia virginiana ) is also known as false dragonhead . This perennial efflorescence grows 2 to 3 animal foot marvelous and spreads 6 to 12 in wide . The oblong leaves have serrate border and are 4 to 8 inches long . The flower shape four rows along the floral spike . bloodless and rose - purple bloom come along from mid - summer to fall . Obedient plants quickly sow themselves so it may become a weed if let go uncivilized .

Pink Buttercups

Pink buttercup ( Oxalis adenophylla ) is also call the silver cuckoo bread , Chilean sorrel and pink carpet oxalis . This blossom reaches 6 to 8 inches tall . The silvery leaves are pleated looking . The five - petaled blossoms afford astray and get across the leafage with flowers . The blossoms are clean with pink petal tips and petite red middles . Pink butter-flower fly high in full sun with clean tone . This flower uprise in the high mountains in Chile and Argentina .

Pussytoes

Antennaria dioica ( Antennaria dioica ) are semi - evergreen efflorescence that die back if exposed to freeze temperatures . Pussytoes spread in 8 to 12 inch clumps of argent foliation . The spatula - shaped leaves physique rosette 2 inches tall . The folio are whitened - wooly on the undersides . This thick mat becomes overlay with fuzzed white and pink blossom sprouting from 6 - to-12 - inch - tall thick flush stalking . Pussytoes do well as groundcover , but do n’t endure infantry traffic .

Rock Cress

Rock cress ( Arabis caucasica ) is a low - arise perennial of evergreen plant leaf . The leaf are ellipse with serrate edge . The foliage is gullible or grey with ointment markings . Tiny peak are ashen or pinkish and only have four petals that appear in spring and other summertime . sway cress grows well in John Rock garden or as a primer coat cover . Rock cress is tolerant of prolonged arid condition .

References

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