Canada's Plant Hardiness Site

Centaurea nigra L.

black knapweed, hardheads, Spanish buttons, lesser knapweed, horse-knops

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Data Details

Number unique observations: 633
Zone range (Canada): 2a - 8a

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	1
3b	3
4a	9
4b	10
5a	6
5b	6
6a	4
6b	3
7a	1
7b	1
8a	1
8b	0
9a	0
Outside Canada	52

USDA Zones
Zone	%
1	0
2	0
3	2
4	23
5	30
6	40
7	2
8	1
9	0
10	0
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	5.94	2.14	1.63	2.4	3.12	4.7	5.9	6.9	9.38	10.2	11.24	11.8	-0.3
Max Temperature of Warmest Period	24.35	2.36	19.23	20.7	21.3	22.9	24.2	25.5	27.8	28.84	29.8	30.6	17.8
Min Temperature of Coldest Period	-12.35	3.89	-21.27	-19.6	-18.4	-14.2	-11.5	-10.0	-8.12	-7.2	-5.43	1.0	-23.2
Annual Precipitation	1231.77	191.9	763.0	908.2	998.2	1101.0	1226.0	1369.0	1493.0	1533.0	1621.8	1696.0	621.0
Precipitation of Warmest Quarter	289.82	41.37	125.56	240.8	252.0	269.0	289.0	313.0	336.8	353.0	387.0	421.0	90.0
Precipitation of Coldest Quarter	316.63	78.87	136.96	198.0	219.2	255.0	322.0	377.0	418.0	432.4	479.76	579.0	90.0