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 I force my rhubarb? ›

By shutting out light, and enclosing to increase the ambient temperature, the stems grow tall in search of light. The lack of light also reduces the oxalic acid in the stems. Oxalic acid gives rhubarb it's sour taste so forced rhubarb is sweeter than when left to it's own devices.

What is the forced rhubarb method? ›

Under normal growing conditions, a rhubarb crown will start to sprout and grow new stalks in spring, but by keeping it warm and dark under a pot, you can make the plant put more energy into seeking out the light, meaning that it grows extra quickly and is ready months sooner - as early as February.

What is the best rhubarb variety for forcing? ›

Earlier harvests of sweeter, tender, pale stalks can be produced by covering rhubarb plants with a forcing jar, tall bucket or dustbin in mid-winter, so the stems form in the dark. Choose an early variety, such as 'Timperley Early', and only use a strong, healthy plant.

How do you increase rhubarb yield? ›

The rhubarb plant is a "heavy feeder." The plant must take in large amounts of nutrients from the soil to produce its large stalks and leaves. Make it an annual practice to supplement the soil with either a balanced commercial fertilizer or rich compost, or both.

Do coffee grounds help rhubarb? ›

Incorporating coffee grounds into the soil around rhubarb plants can improve soil structure, promote microbial activity, and enhance overall plant health. Also, coffee grounds can help deter certain pests, such as slugs and snails, which may damage rhubarb foliage.

Is Epsom salt good for rhubarb plants? ›

Verdict: Unless you have a magnesium deficiency in your garden, there is no need to add Epsom salts. Doing so could even be harmful to soil, plants and water. Find out more about healthy soil and getting a soil test.

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.

Does forced rhubarb need sugar? ›

For the gardener these stretched stems have far less of the bitterness associated with traditional, non-forced rhubarb. The pale stems need less sugar to balance their tartness, while the taste is all together more delicate.

Does forced rhubarb taste different? ›

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.

When should you not pick rhubarb? ›

The best time to harvest rhubarb is during the months of May, June and early July. After this, it's best to let the plant be, so it can regrow and recharge to survive the winter. You can cut the flower stalk away before it blooms to help extend the harvesting season.

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 is the best natural fertilizer for rhubarb? ›

When it comes to fertilising rhubarb, you can either apply organic matter, such as homemade garden compost or well-rotted manure, or an organic concentrated fertiliser in granular form to the soil. Garden compost and well-rotted manure generally contain low levels of nitrogen, phosphates and potash (NPK).

How do you fatten up rhubarb? ›

Water weekly in the growing season. An application of Tui Sheep pellets or Tui Chicken and Sheep pellets will also benefit the plant and hopefully help grow large stalks in the season to come.

How do you encourage rhubarb? ›

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.

How do you revive limp rhubarb? ›

Limp rhubarb can be perked up by standing the stems upright in chilled water for about an hour. A word of warning: rhubarb leaves are poisonous due to their relatively high oxalic acid content and must be discarded. The shredded leaves, mixed with water, were once used as an insecticide to spray over plants and bushes.

How does forced rhubarb grow without light? ›

When we force rhubarb indoors over the winter, we're tricking a dormant rhubarb root into thinking it's spring. We trick it by putting it somewhere warm. That warmth stimulates growth. If you've ever grown plants in conditions where there's not enough light, you'll know that they get lanky, with long stems.

Does cutting rhubarb encourage growth? ›

Like most vegetables and herbs, rhubarb plants can become weak and stop growing if they're over-harvested. To avoid this problem, always leave at least one-third to half of the plant's stems intact and wait for the plant to produce more stalks before harvesting again.

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