Select three large stalks, wait for the leaves to open and pull between May and August. This is UK information, times vary for other countries
That is the best time if it is ready to be harvested
Do not eat the leaves, the stalks are edible but best when cooked
Best not to and avoid any problems, it can cause diarrhea and dehydration
Rhubarb is ripe when the stalk is a dark red. If its still mostly green, it's not ready to be picked yet, unless you want it really sour! Actually, there are two types of rhubarb and several varieties of each type. Red rhubarb emerges with a red stalk that is completely red. It's ready to pick whenever you're ready to pick it, and a rhubarb that is constantly harvested will continue to send out new stalks until it gets too cool at night. Green rhubarb emerges green and will never turn completely red, no matter how long you wait. Some varieties will have a reddish base when the stalks get very thick. Both varieties do not get 'sweeter' as the stalks get bigger.
Rhubarb actually comes in several color varieties; from green to speckled pink to ruby red. It is safe to eat the stalks of green rhubarb, but never eat them if they have been frostbitten, and never ever eat the leaves of the rhubarb plant, as they are poisonous.
rhubarb is a plant that you can eat when it is cooked
Animals should not be encouraged to eat rhubarb
Rhubarb is the whole plant. You eat the stalks of the plant.
Any animal should not be encouraged to eat rhubarb
True possums (those found in Australia and nearby islands) do not eat rhubarb leaves.
tannins
No! Rhubarb contains oxalates, which can affect the digestive, nervous, and urinary systems.