The condition " hardiness zone " bear on to the clime or area in which a specific industrial plant will rise well . These areas are given numbers by the U.S. Department of Agriculture ( USDA ) . They are ranked accord to the expanse ’s average minimum low temperature . The higher the number , the hot the climate . USDA plant hardiness zone 10 and 11 , for example , are tropical areas of the state and rarely , if ever , dip below freezing . hydrangea vary only slightly in their hardiness zone prerequisite , depending on the metal money .

Types

There are 23 species in the Hydrangea genus , but only five are commonly cultivated in the United States , according to the U.S. National Arboretum . They are the bigleaf hydrangea ( Hydrangea macrophylla ) , the climbing hydrangea ( H. anomala ) , the smooth hydrangea ( H. arborescens ) , the oakleaf hydrangea ( H. quercifolia ) and the panicle hydrangea ( H. paniculata ) .

Temperate Climates

All five of the common hydrangea species grow well in the mild , temperate climates of USDA zones 6 and 7 . These climates have warm summers and nerveless winter , with wet atmospheric condition peculiarly in the spring and fall . This ensures that the grease remain coolheaded and moist , which allows hydrangea to thrive . The average minimum temperature in these zone is -10 degrees F in geographical zone 6 and 10 degrees F in zona 7 .

Cold Zones

Some hydrangeas are cold-blooded - hardier than others . The panicle hydrangea can tolerate cold zones better than all the others , according to Ohio State University . This hydrangea is cold - dauntless to USDA zona 3 , which has an average minimum temperature of -35 degrees F. This zone extends to region of Montana , Wisconsin , Minnesota and even part of Alaska . fluent and climbing hydrangea are frigid - hardy to USDA zone 4 ( average minimal temperatures of -25 degrees F ) , which includes role of Minnesota , Montana and Nebraska . The oakleaf hydrangea stand cold temperature in geographical zone 5 , which has an intermediate minimum temperature of -15 degrees F and let in parts of Iowa , Illinois , Missouri and Pennsylvania .

Hot Zones

Oakleaf , bigleaf and fluent hydrangeas can all tolerate the hot temperatures of USDA zona 9 , which have an average minimal temperature of 25 to 30 level F. This zone extends to the northerly percentage of Texas and Florida . Climbing hydrangeas can only tolerate the strong temperatures of zona 7 , while panicle hydrangeas can mature well in the heating plant of USDA geographical zone 8 .

Adaptability

The panicle hydrangea is the most adaptable of all the hydrangea when it do to hardiness zone . This hydrangea , which feature creamy - white panicle ( long , sharpen peak spikes ) , can prosper in USDA zone 3 through 8 , according to Ohio State Univesity . Bigleaf and climbing hydrangea are the least adaptable . Bigleaf hydrangea are picky about the moisture in the ground and only grow well in zones 6 through 9 . climb hydrangeas do not like the hotness and only acquire well in zones 4 through 7 .

References

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