You don't make rhubarb red, that's the way it naturally grows. When it is grown and ready to be picked it is already red...
Sorry but that answer is incorrect, some are red some are green.
Is there a way to change it to make a green plant grow red ??
Sure next year we can pick a reddish crown ?? but what about now whilst it is growing large ??.. Mal
swiss chard and rhubarb
You may be thinking of rhubarb, a green and pinkish red vegetable that looks similar to celery in shape. It is often paired with strawberry to make Strawberry-Rhubarb Pie.
It ranges between pink and red.
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.
Pudding
Rhubarb is a vegetable that looks a lot like celery but is red on its stalk. It has a tangy taste and is often used to make pie on its own or mixed with strawberries. Rhubarb is also an ancient herbal medicine which has found medicinal value as a laxative.
It the pink or red bit as you want to call it.
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.
That may be the colour of the variety that you are growing, other than that it is not yet ripe
Rhubarb Rhubarb was created in 1980.
The duration of Rhubarb Rhubarb is 1680.0 seconds.
I make it 108 but the size of the seeds vary so it could differ slightly from pack to pack.