Rhubarb has many uses. The most common is medicinal. Rhubarb has been used in medicines and folk healing for centuries.
http://www.rhubarbinfo.com/rhubarb-uses.html
Use Rhubarb to clean your pots and pans (no joke!) If your pots and pans are burnt, fear not! An application of rhubarb over the afflicted area will bring back the shine in next to no time. Environmentally friendly too! 8

Rheum palmatum
This is a fairly strong dye that can create a more golden hair color for persons whose hair is blond or light brown. Simmer 3 tbsp. of rhubarb root in 2 cups of water for 15 minutes, set aside overnight, and strain. Test on a few strands to determine the effect, then pour through the hair for a rinse. 26, 39
Rhubarb leaves can be used to make an effective organic insecticide for any of the leaf eating insects (cabbage caterpillars, aphids, peach and cherry slug etc). 6,15
- Basically you boil up a few pounds of rhubarb leaves in a few pints of water for about 15 or 20 minutes,
- allow to cool,
- then strain the liquid into a suitable container.
- Dissolve some soap flakes in this liquid and use it to spray against aphids.
So, next time you pick some rhubarb stems to eat, you can put the leaves to good use rather than just composting them (which isn’t in itself such a bad use, I guess).
- Shred 1.5 kg (3 lbs.) rhubarb leaves
- and boil in 3.5 liters (1 gallon) of water for 30 minutes.
- Allow to cool and then strain. (use old utensils if you can – the rhubarb will stain most things and poison the rest.
- In a small saucepan heat to boiling point 2.5 litters (2.5 quarts) of water and mix in 125 g (4 oz) of softened soap ends (any bits of soap left in the shower).
- Allow to cool (stirring regularly to make sure all the soap is dissolved).
- Add to the strained leaf mixture, stir vigorously, and the spray directly onto infested leaves.
The unused spray can be kept for a day or two, but keep your kids away its still quite harmful.
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Rhubarb leaves poisoning
http://www.nlm.nih.gov/medlineplus/ency/article/002876.htm
Rhubarb leaves poisoning occurs when someone eats pieces of leaves from the rhubarb plant.
This is for information only and not for use in the treatment or management of an actual poison exposure. If you have an exposure, you should call your local emergency number (such as 911) or the National Poison Control Center at 1-800-222-1222.