Hydrangea...vines question

This may be a silly question, but I am not absolutely sure of the answer.

At the bottom is information about the climbing Hydrangea, It says =
Hardiness Zones: 4 to 7


>>> Since 8,9, and zone 10 are warmer - is it good for those zones also?


>>> Are is it that it doesn't get a hard enough winter for zones 8,9, & 10,
and won't grow properly?


>>> Are is it that it get's too hot in zones 8,9,&10 to grow properly?


==========================================

Hydrangea anomala subsp petiolaris--Climbing Hydrangea

Hardiness Zones: 4 to 7
Height: 75 ft   Spread: variable  Form: irregular
Type: deciduous vine
Annual Growth Rate: more than 18 inches
Flowers: White


Comments: As its name implies, this hydrangea is a vine
with the ability to cling to surfaces while spreading 75
feet or more.  The flat clusters of white flowers appear
in summer.  The exfoliating bark is ornamental in winter.
The plant will grow in sun or shade and prefers a moist
but well-drained soil.

Cheers = Cajun Joe
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