How to Force Rhubarb (Plus Bonus Recipe) - Julia Dimakos (2024)

I have recently made the most amazing discovery and I’m so excited to share it with you!

Rhubarb has been growing in my garden for over 5 years. I have added several plants since then and have about 7 plants in total. Every year, I’ve had to wait until well into May, in order to harvest it.

However, I’ve found an easy way to speed up its growth. This method produces rhubarb that is a delight to the senses and it’s flavour is sweeter and more tasty than traditionally grown rhubarb.

How would you like to get a head start on your rhubarb plants?

Here’s what I’ve done in order to speed up my rhubarb’s growth. The result is a sweet and tender harvest, unlike any sold in stores or farmers markets. By following this approach, you too will be able to harvest a surprising and delightful rhubarb, that will make you the envy of all your gardening friends and neighbours.

The concept of forcing rhubarb has been practiced by gardeners in Britain since the late 1800’s. At that time, rhubarb was forced to produce fresh fruit at a time of year when fresh fruit was hard to come by. Dark sheds were built, which restricted all outside light, in order to grow rhubarb. The warm and blackened-out conditions of the sheds, allowed rhubarb’s rhizomes to quickly produce long, tender stalks.

The practice of forcing rhubarb increased during the first and second world wars, as more rhubarb sheds were erected and the demand for rhubarb increased. During that time, shipping became very difficult, since many ships were sunk. As a result, fresh fruit was unable to reach the country from abroad.

Today, the practice of rhubarb forcing continues in Britain and other parts of Europe. The best part is you don’t need to have a blackened-out shed in order to force your own rhubarb. All you need is a large woven basket, large clay pot, rhubarb forcer or any other dark vessel that can be placed over top of the rhubarb. If your pot has a drainage hole on top, cover it with a large stone or dark material, to block out any and all light.

When light is excluded from the rhubarb, it accelerates its growth as it reaches in search for light. As a result, photosynthesis does not take place, causing the stalks to be a bright crimson colour and a delicate sweet flavour, which doesn’t contain any of the bitterness that photosynthesis creates, and which is prevalent with normally grown rhubarb.

How to Force Rhubarb (Plus Bonus Recipe) - Julia Dimakos (2)

Rhubarb before covering

How to Force Rhubarb (Plus Bonus Recipe) - Julia Dimakos (3)

About to cover the Rhubarb

Here’s What You Need to Force Your Own Rhubarb:

Tools:

  • Wicker basket, large black plastic pot (for flowers), large clay pot, decorative rhubarb forcer or any large container that can be placed over the rhubarb crown, which will completely prevent any light from reaching the rhubarb.
  • Large stone, brick or any other material to cover the drainage hole, which will be at the top of the container (or in this case, the underside flipped upside-down)
  • How to Force Rhubarb (Plus Bonus Recipe) - Julia Dimakos (5)

    Rhubarb Forcing After 5 Days

  • Small hand spade

Directions:

  1. Using your spade, pull back any leaves, weeds, or excess dirt, which has accumulated around the rhubarb crown.
  2. Cover the rhubarb crown with a large pot, wicker basket, clay pot or any other large container.
  3. Cover any drainage holes with a large stone, brick or even black plastic sheet, in order to exclude all light from the rhubarb.
  4. Begin checking your rhubarb in 2 weeks and start harvesting its stems when they have reached your desired length.
  5. Be sure to pull each stem out from the crown when harvesting. It takes a bit of a tug, but they will come out with a pop. Do not cut them, or you may encourage disease to enter through the cut portion.
  6. Replace the container and allow the rhubarb to continue to grow.
  7. Be sure to leave a few stems on the plant, rather than harvest all of them. The remaining stems will feed the rhubarb’s roots and replenish its energy. At this point, remove the container and let the rest of the plant grow. Do not continue harvesting for the year.

Note: Do not force your rhubarb plant, for a second year in a row. Forcing weakens the plant’s roots. They would need at least a year’s rest to recover.

Ideally, it is best to have several rhubarb plants, which would allow you rotate them through a yearly cycle.

One other word of caution!

  • Be sure to remove all rhubarb leaves before consuming. They are poisonous and unsafe for human consumption. The stem part of the rhubarb is the only edible portion of the rhubarb and it is actually quite good for your health. Simply cut off the leaves when harvesting and throw them into your compost bin.

I hope you give rhubarb forcing a try! I’m sure you will the experience the same thrill as I did, when I discovered gorgeous crimson rhubarb stalks, growing mysteriously under a dark container.

How to Force Rhubarb (Plus Bonus Recipe) - Julia Dimakos (6)

Rhubarb 4 Days Later

How to Force Rhubarb (Plus Bonus Recipe) - Julia Dimakos (7)

Rhubarb has outgrown the smaller cover and is now under a larger one.

Do you force your rhubarb? What’s your favourite way to eat it?

I’d love to hear about your experience in the comments section below. Alternatively, please send me an email.

Happy Gardening!

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How to Force Rhubarb (Plus Bonus Recipe) - Julia Dimakos (2024)

FAQs

How do you make rhubarb forcer? ›

How to Force Rhubarb. The easiest way to force rhubarb is to do it in situ, without disturbing the crown, while the plants are still dormant in late winter. The object is to cover promising buds so that light is completely obstructed and, ideally, warmth is introduced. I use a large upturned pot for this.

How long should you force rhubarb for? ›

Pile some manure or compost around the sides of the pot - this will keep your rhubarb warm and help it grow quicker. Leave it for about 7-8 weeks. Your forced rhubarb is ready to pick when the stalks are touching the top of the pot or when they're about 45-50cm long.

What are the tips and tricks for rhubarb? ›

Watering and feeding

Established rhubarb plants – water only during prolonged dry periods in summer or in very light, free-draining soil. Growth will slow down and even stop if conditions are too hot and dry. Rhubarb in containers – water regularly throughout the growing season, as the compost will dry out quickly.

Will rhubarb grow in Zone 7? ›

Rhubarb grows best in zones where the ground freezes in winter. Plants require an extended chilling period with temperatures below 40 degrees to produce a crop of stems. As a result, rhubarb is commonplace in gardens throughout the coldest sections of the country, although it can be grown as far south as zone 7.

Why does forcing rhubarb work? ›

First, the rhubarb stalks grow faster than usual as the plant searches for light to make chlorophyll. Second, the sweet glucose produced in the rhubarb that would normally be used to grow the plant's huge leaves is instead stored in the stalks. This means that the stalks of forced rhubarb are sweeter instead of sour.

What is forced rhubarb called? ›

Yorkshire Forced Rhubarb (Rheum rhaponticum) is an out of season rhubarb that is first grown outside for a period of two years so that the exposure to frost toughens the roots. After initial exposure to the frost, the Rhubarb is lifted from the ground and placed into forcing sheds.

What month do you force rhubarb? ›

Rhubarb forcing can happen anytime between November and March, many gardeners tend to start forcing around January/December time, as there is usually a lull in the gardening calendar at this time of year. Once your rhubarb crown is established in its planting location you will need to cover it with the rhubarb forcer.

What is the difference between forced and unforced rhubarb? ›

Forced rhubarb is sweeter than the ordinary kind as it has less oxalic acid. The forced stems are also pinker because plants can't make the green pigment chlorophyll in the absence of sunlight, which makes for nicer-looking desserts.

Does forced rhubarb taste better? ›

Oxalic acid gives rhubarb it's sour taste so forced rhubarb is sweeter than when left to it's own devices. The result is pale pink, long, tender stems, with small leaves and a sweet, delicate flavour.

Do coffee grounds help rhubarb? ›

Rhubarb prefers a pH below 7.0 (neutral to acidic — adding peat moss, compost, coffee grounds and Espoma Holly-Tone organic fertilizer can help acidify soil).

Can you eat rhubarb raw? ›

Its stalks are deeper red and tinged with green, while its leaves are bright green. It has a more intense flavour and robust texture than the forced variety. Although it can be eaten raw, rhubarb tends to be too tart this way, and it's usually best when cooked with plenty of sugar.

Do you soak rhubarb before cooking? ›

Wash rhubarb with cool tap water, but do not soak.

What should not be planted near rhubarb? ›

Plants to Avoid Near Rhubarb
  • Brassica Family. While members of the Brassica family, like broccoli, cauliflower, and cabbage, are staples in many gardens, they don't typically make good neighbors for rhubarb. ...
  • Potatoes. ...
  • Black Walnut. ...
  • Tomatoes.
Aug 11, 2023

How hot is too hot for rhubarb? ›

Rhubarb needs at least 500 hours of winter temperatures between 28°F and 40°F to properly form new leaf buds. It requires spring temperatures above 40°F to break dormancy and to stimulate growth and summer temperatures averaging less than 75°F for vigorous vegetative growth.

What is the best fertilizer for rhubarb? ›

For the highest yields of rhubarb stems, fertilize your plants three times per year. Apply 2 to 3 inches of composted manure, compost or ½ cup of an all-purpose garden fertilizer, such as 10-10-10, around each plant in early spring (now). Once growth starts to occur, apply fertilizer again.

What is the difference between forced rhubarb and normal rhubarb? ›

Forcing involves preventing light from reaching the crowns of the rhubarb plants. This triggers the production of delicious pale stalks perfect for cooking. Forced rhubarb is softer and sweeter than rhubarb harvested in early summer. It's a real treat to eat fresh when spring is still on its way.

What can I put on my rhubarb to make it grow? ›

Caring for rhubarb

Mulch around the base of plants with home-made compost, well-rotted manure and leaf mould in autumn, to suppress weeds, increase fertility and retain soil moisture. Giving plants a liquid feed in spring will also aid strong growth.

Does a rhubarb forcer need a lid? ›

Once shoots appear the lid is taken off, causing them to grow towards the light. Around 18 inches (46 cm) high and 14 inches (36 cm) wide without the lid, they are traditionally made of terracotta but can be as simple as an upside down plastic bucket.

References

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