Rheum are hardy perennials that are often used in cookery.
They are large plants, that can reach from 90 cm to 2.5 m (3 to 8 feet) in size.
Rheum plants have large toothed leaves. They carry small white flowers atop edible stalks.
Some common names for Rheum are Rhubarb and Sorrel Rhubarb.
Rheum (Rhubarb) by OliBac.
If you are planning to grow Rhubarb for use in cooking, then it is best to grow from rootstock as these will provide better flavour than seed grown rhubarb.
The Rhubarb stalks can be harvested from the second year of growth onwards. They should not be harvested later than July.
Rheum palmatum (Ornamental Rhubarb / Chinese Rhubarb), photograph by Leonora (Ellie) Enking; CC.
Rheum officinale (Indian Rhubarb), picture by Laurent Neyssensas; CC.
It is best to grow Rhubarb from root stock if you plan to use them for culinary puproses. These these should be planted at about 3 to 5 cm (1 to 1 1/2 inches) deep.
If growing Rhubarb and other Rheum members as decorative plants, then they can be grown from seed.
Plant the seeds about 6 mm (1/4 inch) deep. Do so about a month before the last frost of spring is expected.
Rheum can be very big plants, so space them from 40 cm (16 inches; small varieties) to 1.5 m (5 feet; larger Rheum members) apart.
Rhubarb can grow in either sunny or partially shaded parts of the garden. They prefer a rich and moist soil. It is important that the soil that Rheum plant species grow in is very deep.
If starting Rhubarb off indoors, then do so about 2 months in advance. Plan to transplant out in late autumn, or before the last frost of spring.
It should take from three to six weeks for Rheum to germinate, at 15 to 18 degrees Celsius (59 to 64°F).
To grow Rhubarb and other Rheum species successfully takes a little effort.
They should be fertilized every two weeks with a weak fertilizer solution.
Apply a mulch to protect them from heat, and water frequently to keep the soil moist.
If you require more Rhubarb plants, then they can be propagated by division in the spring.
I hope that you enjoyed this guide on how to grow Rheum plants. You may also enjoy the following Gardener's HQ growing guides: How to grow Prickly Rhubarb, Chinese cabbage, Lima Beans, and Polygonum plants.