Canada's Plant Hardiness Site

Symphytum officinale L.

common comfrey, healing-herb, bruisewort

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Data Details

Number unique observations: 1145
Zone range (Canada): 2a - 9a

p 1971-2000

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Hardiness Zones

Canadian Plant Hardiness Zones
Zone	%
0a	0
0b	0
1a	0
1b	0
2a	1
2b	1
3a	2
3b	4
4a	4
4b	4
5a	2
5b	2
6a	1
6b	1
7a	1
7b	1
8a	1
8b	1
9a	1
Outside Canada	74

USDA Zones
Zone	%
1	0
2	0
3	7
4	19
5	24
6	29
7	13
8	4
9	1
10	1
11	0
12	0
13	0

Bioclimatic profile

name	mean	S.D.	1%	5%	10%	25%	50%	75%	90%	95%	99%	maximum	minimum
Annual Mean Temperature	7.97	2.74	2.09	3.72	4.6	6.1	7.7	10.0	11.3	12.68	15.1	16.5	-0.6
Max Temperature of Warmest Period	26.74	2.42	21.24	22.9	23.44	25.2	26.8	28.3	29.56	30.88	32.46	34.8	18.1
Min Temperature of Coldest Period	-10.24	6.14	-22.46	-18.58	-17.3	-14.5	-11.1	-7.5	0.46	0.98	3.67	5.6	-28.0
Annual Precipitation	1031.39	271.26	378.52	478.2	749.0	876.0	1025.0	1184.0	1307.6	1471.8	1806.12	2164.0	296.0
Precipitation of Warmest Quarter	249.8	85.32	12.0	79.0	104.4	226.0	275.0	310.0	333.0	343.0	371.12	506.0	6.0
Precipitation of Coldest Quarter	260.83	147.21	42.0	70.0	106.0	176.0	227.0	296.0	493.6	579.0	747.0	830.0	28.0