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Bulbs and corms January 22, 2026 0

Amaryllis (Hippeastrum) Grow Guide – Botanical Overview Family: AmaryllidaceaeGenus: HippeastrumOrigin:...

Events January 1, 2026 0

Stowe Gardens in Buckinghamshire is best understood not as...

Events January 1, 2026 0

Chelsea 2025 felt quieter in spirit than some previous...

Events January 1, 2026 0

MALVERN, WORCESTERSHIRE – , held from 8 to 11 May at the...

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Hardiness zones

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