How to Force Rhubarb: A Guide to Growing Sweeter Stalks

If you're a fan of sweet, tender rhubarb stalks, you might be interested in learning how to force rhubarb. This technique involves manipulating the plant to grow earlier than it normally would, resulting in more tender and less tart stalks. In this guide, we'll take you through the steps needed to force rhubarb for a delicious spring harvest.

What is Forced Rhubarb?

Forced rhubarb refers to the process of growing rhubarb plants in a dark environment to stimulate early growth. The technique involves covering the crown of the rhubarb plant with a large pot or bucket to block out light. This forces the plant to produce longer, more tender stalks that are sweeter than those grown under normal conditions.

When Should You Force Rhubarb?

The ideal time to start forcing rhubarb is in late winter or early spring, around January or February. This allows enough time for the rhubarb to grow before being harvested in early to mid-spring. However, if you're gardening in a warmer climate or a greenhouse, you can force rhubarb at any time of the year.

How to Force Rhubarb

Step 1: Preparing the Rhubarb Plant

Before you start forcing rhubarb, make sure the plant is healthy and strong. Remove any dead or damaged leaves and cut back any old stems to the base of the plant. If the plant is too tall to fit under your chosen covering, trim the remaining stems down to a manageable size.

Step 2: Covering the Rhubarb Crown

Choose a large pot or bucket that can fit snugly over the entire crown of the rhubarb plant. Place the container over the crown so that no light can reach it. If there are any gaps between the container and the soil, fill them in with straw or compost to insulate the plant.

Step 3: Waiting for Growth

Once the plant is covered, move it to a cool, dark place such as a shed or garage. The temperature should be around 50°F (10°C) to encourage growth. Check on the plant every few days to make sure it is not getting too dry, and water it lightly if necessary.

Step 4: Harvesting Forced Rhubarb

After about six to eight weeks, the rhubarb stalks should be ready for harvesting. Lift the container off the crown and carefully remove the stalks by pulling them downwards. Be sure to leave some stalks behind so that the plant can continue to grow and produce more stalks throughout the season.

Tips for Successful Forced Rhubarb

Here are some tips to help you successfully force rhubarb:

• Choose a hardy variety of rhubarb, such as 'Timperley Early' or 'Victoria', which are known for their good yields and strong growth.
• Make sure the container you use to cover the plant is large enough to accommodate the growing stalks.
• Check on the plant regularly to ensure it is not drying out, but be careful not to overwater it.
• Leave some stalks behind when harvesting to allow the plant to continue growing and producing.

A healthy rhubarb plant ready for forcing

Forcing rhubarb is a great way to produce sweet, tender stalks earlier in the year. By following these simple steps, you can enjoy a delicious spring harvest of this classic garden favorite. Just remember to choose a hardy variety, cover the plant properly, and monitor it carefully for successful results.

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