Canna Archives - Local Gardener

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Asked: November 19, 2024

What are the hardiest Cannas?

What are the hardiest Cannas?

While all cannas benefit from winter protection in the UK, some varieties are notably hardier than others. These differences in hardiness depend on their parent species, with some cannas tolerating light frost and damp soils better than others. Here’s a ...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