To grow rhubarb with really long stems, put a bucket round the crown. Cut the bottom out of the bucket first of course.
As the leaves reach for the sunlight at the top of the bucket, so it forces longer stems, giving you a bigger harvest without using more garden space.
It also reduces evaporation of moisture from sun and wind, which is good as rhubarb likes a lot of water and food. Feed with well rotted manure, sheep pellets or vegetable fertilizer. As it’s the leaf stem that you eat, it is actually a vegetable, not a fruit.
Although the leaves are poisonous, they can be put in the compost. They can also be used to make an organic pesticide, but I don’t know any recipes.