You still leave the possibility open that a different toxin might be a danger and I won’t be eating rhubarb leaves soon. A crazy mountain man type told me years ago that “twice boiling” rhubarb leaves made them quite edible. 1) Do you have any published information that rhubarb leaves are harmful? Rhubarb pesticide is also a myth – see my nest post. My Rhubarb starts out great in the spring, no dead leaves around and then, after a month or two, the leaves and stalks wilt back and die. I’ve also heard and ignored the advise not to compost rhubarb leaves because of toxicity. So interesting! How do I secretly bury the ashes of my dead wife at an Arboretum with a marked grave without being discovered by staff? Gardening with plant companions in mind, is a great gardening concept. Rhubarb makes anthraquinone glycosides which have been proposed as the likely candidate for deaths. In plants that have high amounts, such as some of the aroids like dieffenbachia, if a person or pet chews on the plant, crystals become lodged in the throat causing it to swell, and resulting in possible suffocation. Oxalic acid is not the only toxic chemical found in rhubarb leaves, and the dose isn’t directly comparable to other plants. I was derided at a BSA meeting where I pointed this out and have never been back. I don’t like rhubarb at all, and never eat any part of it, but I eat lots of carrots and the other things listed here, so am glad that they are not poison either. The actual leaves of rhubarb are toxic... so yeah, probably. ;). When this happens I use 1 cup of milk in a gallon of water and spray both sides of the leaves and stem. Here are the values for some common vegetables (ref 2). 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Before Calling Emergency Determine the following information: The National Poison Control Center (1-800-222-1222) can be called from anywhere in the United States. How much oxalic acid is found in the stalks? -_-, The leaves contain poison, and will give you a rash on your skin, but I think you would have to eat quite alot of them before you actually died from them. I use a lot of drip irrigation, never water overhead and am in the midst of a drough and sill get powdery mildew on plants. Rhubarb contains oxalate, which have been reported to cause poisoning when large quantities of raw or cooked leaves are ingested. The PM should be gone after you spray every other day 2 or 3 times. Lets dig into the truth. Breathing difficulty How toxic are they? It needs its own nutrient fact sheet people, I’d use it like silver beet if l could find a little more info. Ideas will be appreciated whether its seeds, edibles, or flowers. Is Tea a Good Fertilizer for Houseplants? Poisonous Ingredient : Soluble oxalate and another, unknown poison. In the 1950’s, what was considered to be an old wives tale today would have been considered close to gospel back then. Copyright © 2020 Garden Myths | Will Methanol Foliar Spray Grow Bigger Plants? How do you think about the answers? Is there any magical fertilizer available in the market that can boost the plant growth by 10x? The bottom line is that the leaves may be poisonous, if you eat enough – so don’t do that! Carolyn Langdon says: June 20, 2017 at 1:37 pm. I always thought the same and like most people in the UK after the war, rhubarb was widely grown and eaten. I never realized that the poison in the leaves was oxalic acid. This national hotline number will let you talk to experts in poisoning. I love the way you challenge gardening myths and if not debunk them at least give us some research as the basis for your views. Burning in the mouth . Are Marigolds Good for Companion Planting? As I understand it, oxalic acid forms small sharp crystals. You still leave the possibility open that a different toxin might be a danger and I won’t be eating rhubarb leaves soon. Try posting that question on our Facebook Group: https://www.facebook.com/groups/GardenFundamentals/. The leaves of rhubarb can grow quite large which makes it easy to just lay them down as mulch between plants. It comes back the following year if I keep it minimally moist. If you have a kidney condition and eat a lot of foods and drinks containing oxalic acid then you have to balance it with bio available calcium. Grew up in the country in the U.K. Rhubarb pies were the weekly thing while in season. And you’ve written this as if death is the only outcome that matters. Nuncle H. Very eye opening! Serious harm or serious discomfort can happen at a non fatal dose… As a young daughter of a friend of mine accidentally learned today. Your article is absolutely fascinating and a tribute to your inquiring mind.- and I won’t be stopping eating my parsley and egg sandwiches. We grew up eating it and we knew about the poisonous leaves! Thank you for the info; it gives me things to think about. I’ve also heard and ignored the advise not to compost rhubarb leaves because of toxicity. Only ideas please? Soluble oxalate and another, unknown poison. Not sure about the leaves but my doc did tell me to cut down on eating raw Rhubarb as it is too acidic for the stomach. I found lots of references that said they contain much less oxalic acid, but only one reference gave a value of  0.4 to 0.5 g/100 g which is only a bit less than the leaves.

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