RHS hardiness zones Archives - Local Gardener

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Asked: April 24, 2024

What is The Difference Between RHS Hardiness Ratings and USDA Zones

What is The Difference Between RHS Hardiness Ratings and USDA Zones

Understanding the suitability of plants for different climates is essential for successful gardening and landscaping. Two widely used systems for determining climate suitability are the Royal Horticultural Society (RHS) Hardiness Ratings and the United States Department of Agriculture (USDA) Plant ...Read more

RHS Hardiness Ratings	USDA Plant Hardiness Zones	Approximate Temperature Range (°C)
H1a H1b H1c	13 12 11	>15°C 10 to 15°C 5 to 10°C
H2	10b	1 to 5°C
H3	9b to 10a	-5 to 1°C
H4	8b to 9a	-10 to -5°C
H5	7b to 8a	-15 to -10°C
H6	6b and 7a	-20 to -15°C
H7	6a	Below -20°C