Growing Rhubarb

Rheum rhabarbarum : Polygonaceae / the dock family

Jan F M A M J J A S O N Dec
      P                

(Best months for growing Rhubarb in USA - Zone 5a regions)

  • P = Plant crowns
  • Easy to grow. Plant pieces of rhizome or roots 8 - 10 cm (3 - 4 in.) deep. Best planted at soil temperatures between 41°F and 68°F. (Show °C/cm)
  • Space plants: 35 inches apart
  • Harvest in approximately 1 years. You will have a stronger plant if you leave it for about a year before using..
  • Compatible with (can grow beside): Brassicas (Cabbage, Broccoli, Cauliflower, etc)
  • Young rhubarb
  • Rhubarb Plant

Rhubarb is easy to grow in cool climates and is a perennial. Rhubarb can be left in the ground and will return a crop for many years, at least 10 to 15 years (We have one that is more than 20 yrs old). Rhubarb is quite a hardy crop but the crown will rot if in heavy wet clay soils. It can cope with dry periods. Plant in good soil and remove as many weeds as possible. Do not disturb rhubarb roots when cultivating round the plant. Better in cooler climates, but can be grown in shady areas of warm climates. You can lift and divide rhubarb to make more plants. It is best to do this when the plant is dormant (or at least less actively growing) in winter or late autumn. It is best to wait until a plant is about 5 years old before dividing the crown but it can be moved at any age. Some of the root structure will be damaged when lifting it, so stalk production will not be so good for a few months. If you have mild winters and your rhubarb is still producing new stalks, you can continue to pick it. Although rhubarb is used in desserts and jams, it is considered a vegetable because the stalks are used not the fruit.

NB: Do not eat the leaves or roots as they contain oxalic acid which is poisonous. They should not be fed to poultry or stock either.

Remove flower stalks as they appear as the plant will stop producing leaf stalks when flowering.

Rhubarb can be 'forced' by covering dormant crowns with clay pots or a cloche in early spring.

Culinary hints - cooking and eating Rhubarb

Pick stems about the thickness of your finger. Large stems will have tough 'strings' down the length of them.
Use in pies, crumbles, fools and jams. Rhubarb goes well with orange.
Will usually need sweetener.

Your comments and tips

02 Nov 23, Maren (South Africa - Summer rainfall climate)
My plants are healthy but the stalks aren’t very red in colour? And red only halfway up the stem?
25 Nov 23, (South Africa - Summer rainfall climate)
That is normal.
19 Feb 23, Tony (South Africa - Dry summer sub-tropical climate)
What is the best way to havest rhubarb
29 Apr 23, Celeste Archer (Canada - Zone 7a Mild Temperate climate)
I find the best way to harvest rhubarb is: hold the stalk (flat hand) close to the ground (about 3/4 of the way down) -- push the stalk sideways and backwards (45 degree angle out away from the plant) -- once you hear the snap, grab the stalk twist and pull simultaneously.
19 Feb 23, Liz (Australia - temperate climate)
Hold the stem close to the ground and twist gently as you pull it up
15 Apr 22, Peter Hilhorst (South Africa - Summer rainfall climate)
Can we grow rhubarb in Zambia? We are in a summer rainfall area with about 800mm annual rainfall. Wet / warm season temp 35-43C. Cool/dry season 15-25C. Hot / dry season can go up to 45C.
21 Sep 22, Bee-Pie (South Africa - Humid sub-tropical climate)
Rhubarb prefers cooler weather and needs a cold dormancy period. It needs full sun, but will tolerate some shade. My advice is not to grow them in your area. It will be a waste of resources and time.
19 Apr 22, M (Australia - sub-tropical climate)
Read up the climate zones for South Africa and see if any are similar to yours. If so use the planting guide for that climate zone.
06 Aug 21, Iain Robertson (South Africa - Dry summer sub-tropical climate)
Where in Western Cape can we buy Rhubarb, plants to grow?
02 Jan 22, Adri (South Africa - Semi-arid climate)
Stodels Bellville had some for sale, not sure if they still have. I bought mine a month ago from them. If they do not have they can get you one or will tell you where to buy it from.
Showing 1 - 10 of 62 comments

My Month by Month Florida Gardening book says you can grow rhubarb year-round in north Florida and August to October in central and south Florida. I’m guessing shade cloth would be in order for the latter two the rest of the year. I never cared much for it growing up in Iowa but I think I’ll give it a try at my little hobby farm near Arcadia, Fl just for the challenge of it.

- Amathonn

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