Canada's Plant Hardiness Site

Asclepias syriaca L.

common milkweed, silkweed, silky swallowwort

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Data Details

Number unique observations: 13345
Zone range (Canada): 3a - 7b

p 1971-2000

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Hardiness Zones

Canadian Plant Hardiness Zones
Zone	%
0a	0
0b	0
1a	0
1b	0
2a	0
2b	0
3a	1
3b	2
4a	2
4b	3
5a	2
5b	2
6a	1
6b	1
7a	1
7b	1
8a	0
8b	0
9a	0
Outside Canada	82

USDA Zones
Zone	%
1	0
2	0
3	5
4	19
5	25
6	31
7	15
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	8.65	3.11	2.5	3.9	4.7	6.3	8.5	10.8	13.0	14.0	15.5	17.8	0.1
Max Temperature of Warmest Period	28.39	2.32	23.8	24.9	25.5	26.6	28.3	30.0	31.8	32.3	33.7	35.3	21.7
Min Temperature of Coldest Period	-11.72	5.04	-23.8	-20.2	-18.6	-15.4	-11.1	-8.2	-5.2	-4.1	-1.7	1.9	-26.9
Annual Precipitation	994.04	194.43	507.0	668.0	766.0	857.0	993.0	1136.0	1230.0	1304.0	1434.56	1591.0	421.0
Precipitation of Warmest Quarter	293.5	35.2	215.0	232.0	242.0	269.0	298.0	318.0	336.0	345.0	367.56	404.0	183.0
Precipitation of Coldest Quarter	192.03	84.23	39.0	54.0	69.0	127.0	201.0	256.0	292.0	321.0	386.56	442.0	27.0