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Old 06-26-2018, 07:14 PM
 
Location: Redwood Shores, CA
14 posts, read 3,077 times
Reputation: 20

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Looks like will same reaction as poison oak, but supposedly much more severe and can cause blindness.

Help ID this poisonous plant-img_20180627_090909.png
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Old 06-26-2018, 07:19 PM
 
Location: Redwood Shores, CA
14 posts, read 3,077 times
Reputation: 20
Help ID this poisonous plant-img_20180627_091054.png

Help ID this poisonous plant-img_20180627_091117.png
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Old 06-26-2018, 07:20 PM
 
620 posts, read 158,815 times
Reputation: 792
Hogweed. It is seriously enormous and dangerous. Can look a little like Queen Anne's lace from a tiny picture but it's got really gigantic flower and leaves.
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Old 06-26-2018, 07:52 PM
 
Location: Redwood Shores, CA
14 posts, read 3,077 times
Reputation: 20
On my yard I see some dry plant stalks with a crown-like top structure. Is it possible to tell if it's hogweed?

Help ID this poisonous plant-img_20180627_094543.jpg

Help ID this poisonous plant-img_20180627_094016.jpg

Help ID this poisonous plant-img_20180627_093819.jpg

Help ID this poisonous plant-img_20180627_093704.jpg
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Old 06-26-2018, 08:47 PM
 
620 posts, read 158,815 times
Reputation: 792
You know what, go to google and ask for dead hog weed. Click 'images' if they don't come up right away. I have to say one of my mottoes is better safe than sorry and err on the side of caution in things like this. They look alike. HOWever, that said, I can't enlarge your photos so can't compare well enough.

If you've had these a long time and touched them and had no problems, that's a big clue. If not...remember any part of them flying around and don't touch your eyes or skin after inspecting a branch.

If you look at the images and they look like what you have....do you have an extension agent in your area that can take a look. Seems like something like this is one of the priorities nowadays.

Let us know how it's going.
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Old 06-26-2018, 09:05 PM
 
Location: Redwood Shores, CA
14 posts, read 3,077 times
Reputation: 20
Looks like bad news... I found this pic in my random shots of my yard... The leaves look very much like the plant pics I see when I searched hogweed....

Help ID this poisonous plant-dsc05827-large-.jpg
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Old 06-26-2018, 09:07 PM
 
Location: Silicon Valley
15,754 posts, read 19,226,742 times
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Agree that a good free resource is the county Extension office. Call them and they'll perhaps be able to look at your photos, or they may ask you to bring a sample in. They'd give you direction on what to do.
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Old 06-27-2018, 01:51 AM
 
Location: S.W. British Columbia
5,442 posts, read 5,435,855 times
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The dead plants and live plants look too small for hogweed, but it's hard to tell what size they are from your pictures. I think from the leaves in the last picture you have cow parsnip which is also very toxic in the same way and causes similar reactions as hogweed does. But giant hogweed just starting to grow as baby plants can start out small and then become gigantic, and both species of plants can grow together in the same location, so you really need expert ID and advice from LOCAL authorities.

Is that your hand in that picture of the blistered hand? If so then you need to see a physician for the correct treatment as soon as possible, you will probably need a course of antibiotics too. That is very nasty blistering, and it's typical of the early damage done by either hogweed or cow parsnip. It can get worse and spread and can cause blood poisoning too, amongst other problems, so please get medical attention for it right away.

You are required by law now across all of North America (Canada and USA) to report any suspected hogweed to authorities in your location and they will be eager to help you with advice and identification and procedures for getting rid of it. There are very special precautions and procedures that must be taken to eliminate it from your property and it MUST be done, so you will need their advice and their physical help if they offer it. There are also special procedures you need to take with the clothing and equipment you wear when you're handling it and getting rid of it so familiarize yourself with all of the available information and procedures before you try to tackle that stuff.

The following characteristics and pictures of both hogweed and cow parsnip is intended to help with identification but it really should be identified by a LOCAL expert.



Giant Hogweed Characteristics:


15 to 20 feet tall
stem is 1 to 3 inches in diameter
stem has many purple spots and stiff bristles
leaf can be up to 5 feet wide
umbel-shaped (rounded white flower clusters in which the individual flower stalks arise from about the same point) up to 2.5 feet across
compound, lobed leaves (single leaves with lobes that look like a hand and fingers), which are deeply incised






Cow Parsnip Characteristics:


5 to 8 feet tall
stem is 1 to 2 inches in diameter
stem has a few purple areas and deep ridges, with fuzzy hairs
leaf is 2 to 2.5 feet wide
umbel-shaped (rounded white flower clusters in which the individual flower stalks arise from about the same point) up to 1 foot across
palmate-shaped, compound leaves (looks similar to a maple leaf, or an open palm with fingers outstretched), divided into 3 segments




More information and pictures for how to identify the plants:


http://www.dec.ny.gov/animals/72766.html


https://www.bing.com/search?q=differ...06421FB0C0D6FD


I wish you good luck, it is nasty, nasty stuff to have to contend with, very dangerous.


.

Last edited by Zoisite; 06-27-2018 at 02:16 AM..
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Old 06-27-2018, 02:55 AM
Status: "Support the Mining Law of 1872" (set 14 days ago)
 
Location: Cody, WY
8,859 posts, read 9,687,768 times
Reputation: 17357
California doesn't have Hogweed.

https://plants.usda.gov/core/profile?symbol=HEMA17
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Old 06-27-2018, 04:50 AM
B87
 
Location: Norwich, UK
10,793 posts, read 6,625,809 times
Reputation: 2506
That is Giant Hogweed (H mantegazzianum).

It is a different plant to hogweed (H sphondylium)
which isn't poisonous.
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