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Height: 18-24 in. (45-60 cm) 24-36 in. (60-90 cm) 36-48 in. (90-120 cm) 4-6 ft. (1.2-1.8 m) 6-8 ft. (1.8-2.4 m)
Spacing: 36-48 in. (90-120 cm)
Hardiness: USDA Zone 5a: to -28.8 °C (-20 °F) USDA Zone 5b: to -26.1 °C (-15 °F) USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F) USDA Zone 9a: to -6.6 °C (20 °F) USDA Zone 9b: to -3.8 °C (25 °F) USDA Zone 10a: to -1.1 °C (30 °F) USDA Zone 10b: to 1.7 °C (35 °F)
Sun Exposure: Full Sun Sun to Partial Shade
Danger: All parts of plant are poisonous if ingested
Propagation Methods: By dividing rhizomes, tubers, corms or bulbs (including offsets) From herbaceous stem cuttings From seed; direct sow outdoors in fall From seed; sow indoors before last frost From seed; direct sow after last frost
Seed Collecting: Bag seedheads to capture ripening seed Allow seedheads to dry on plants; remove and collect seeds
On Dec 2, 2006, dragon_lady2 from Sapulpa, OK wrote:
Instead of looking at the leaves to determine if the plant is poison hemlock or queen anne's lace, observe the stem. Hemlock is smooth, has ribbing that runs the length of the plant much like celery only smoothly. Queen Anne's lace is prickly along the main stem. There are times when you won't see the red pin prick in the center of Queen Anne's lace flowers but the stem is either smooth and poisonous and that is hemlock or it is very prickly for queen anne's lace. If in doubt ever, stay away from it. I pull hemlock out always.
On May 25, 2005, melody from Benton, KY (Zone 7a) wrote:
I do not cultivate this plant, it grows wild in my area.
This is a tall plant, usually over 6', with many branches, usually a biennial. It produces a thick rosette of ferny leaves the first year, sends up a multi-branched stem the second that is covered in many umbels of white flowers.
It favors, waste places, weedy roadsides and damp woodland borders throughout the East except for Newfoundland and the Arctic. It is also seen in the West.
It is identified by the deeply toothed compound leaflets. The leaf veins run to the tips of the lobes or teeth, rather than into the notches between them.
As stated above, it is highly toxic and care should be taken when handling it and keep it from grazing farm animals.
Poison hemlock is often found growing wild in marsh and waterside areas here in northeastern Florida. It's a hazard to anyone looking for wild carrots, parsley and the like because of its toxicity and resemblance to these plants. It was used by the greeks to put people to death (the dried roots were made into a toxic "tea")
Regional...
This plant has been said to grow in the following regions:
Golden, Colorado Bartow, Florida Kansas, Illinois Benton, Kentucky Joplin, Missouri Plainfield, New Jersey Roselle Park, New Jersey South Plainfield, New Jersey Walworth, New York Sapulpa, Oklahoma Corbett, Oregon Millersburg, Pennsylvania