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Hardiness - USA
 
 
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Royal Horticultural Society Hardiness Definitions
H Fully Hardy
FH Frost Hardy
HH Half Hardy
FT Frost Tender 		Hardy to -15º C
Hardy to -5º C
Hardy to 0º C
Not Hardy < 5º C
Zone 1 < -45º C   H1
Zone 2 -45º to -40º C   H1
Zone 3 -40º to -34º C   H1
Zone 4 -34º to -29º C   H1
Zone 5 -29º to -23º C   H1
Zone 6 -23º to -18º C   H2
Zone 7 -18º to -12º C H Fully Hardy H3
Zone 8 -12º to - 7 º C H Fully Hardy H4
Zone 9 -7º to -1º C FH Frost Hardy H5
Zone 10 -1º to +5º C HH Half Hardy G1
Zone 11   FT Frost Tender G2

EGF Hardiness Definitions
H1   Hardy to -20º C
H2   Hardy -15º to -20º C
H3   Hardy -10º to -15º C
H4   Hardy -5º to -10º C
H5   Hardy 0º to -5º C
G1   Requires cool greenhouse protection
G2   Requires heated greenhouse protection

Hardiness guide
Stepping Stones’ Acers grow exceptionally well throughout North America. Rated fully hardy these plants can withstand temperatures down to 5ºF. Tolerance of plants to harsh conditions usually increases with age. Whilst juvenile they should receive some winter protection. Please ask for our advice to select suitable varieties for particularly harsh climatic conditions.