Rhubarb, a tart and tangy vegetable often mistakenly referred to as a fruit, has been a staple in many gardens and kitchens for centuries. While it’s commonly used in pies, tarts, and jams, the process of forcing rhubarb remains a mystery to many. But what does forcing rhubarb mean, exactly? In this article, we’ll delve into the world of rhubarb cultivation, exploring the history, benefits, and techniques of forced rhubarb, so you can unlock the secret to sweet, tender, and deliciously tart rhubarb stalks.
A Brief History of Rhubarb and Forcing
Rhubarb has its roots in ancient China, where it was used for medicinal purposes and as a food ingredient. The plant was introduced to Europe in the 14th century, where it became a staple in many gardens. In the 18th century, forced rhubarb became a popular trend in England, particularly among the wealthy. The process involved placing rhubarb crowns in a warm, dark environment to stimulate early growth, allowing for a faster harvest. This technique enabled growers to enjoy rhubarb long before the regular season, making it a sought-after delicacy.
What is Forcing Rhubarb?
Forcing rhubarb is a technique used to coax the plant into producing tender, sweet stalks earlier than usual. By providing a controlled environment, growers can encourage the rhubarb to grow in the dead of winter, when the plant would naturally be dormant. This process involves several key steps:
Step 1: Preparation
To force rhubarb, you’ll need to prepare the crowns by digging them up and potting them in a container filled with a mixture of compost, peat, and perlite. Make sure the container has drainage holes to prevent waterlogging.
Step 2: Dark and Cool Conditions
Place the potted rhubarb crowns in a dark, cool location with a consistent temperature between 32°F (0°C) and 40°F (4°C). This can be a basement, garage, or even a cold frame. The lack of light will stimulate the plant to produce long, thin stalks.
Step 3: Moisture and Temperature Control
Maintain consistent moisture levels by watering the crowns regularly. As the plant grows, gradually increase the temperature to around 50°F (10°C) to encourage further growth.
Benefits of Forcing Rhubarb
Forcing rhubarb offers several advantages over traditional, outdoor cultivation:
Earliest Harvest
The most significant benefit of forcing rhubarb is the ability to harvest the stalks weeks before the regular season. This allows you to enjoy the sweet, tart flavor of rhubarb in the dead of winter, when fresh produce is scarce.
Increased Yield
Forcing rhubarb can increase the overall yield of the plant, as the controlled environment encourages the stalks to grow longer and thicker.
Better Flavor
Forced rhubarb is often sweeter and milder than outdoor-grown rhubarb, thanks to the controlled environment. This makes it ideal for using in jams, preserves, and desserts.
Challenges and Considerations
While forcing rhubarb can be a rewarding experience, there are some challenges and considerations to keep in mind:
Pests and Diseases
The controlled environment can make the rhubarb more susceptible to pests and diseases, such as aphids, slugs, and fungal infections. Regularly inspect the plants and take action quickly to prevent infestations.
Moisture Control
Maintaining consistent moisture levels is crucial to successful forced rhubarb cultivation. Overwatering can lead to root rot, while underwatering can cause the stalks to become woody and tough.
Light and Temperature Fluctuations
Avoid exposing the rhubarb to direct sunlight or sudden temperature fluctuations, as this can cause the stalks to become stressed and brittle.
Tips and Varieties for Successful Forcing
To increase your chances of success, consider the following tips and variety selection:
Choose the Right Variety
Opt for rhubarb varieties specifically bred for forcing, such as ‘Victoria’ or ‘Timperley Early’. These varieties tend to produce longer, sweeter stalks and are more tolerant of the controlled environment.
Monitor Temperature and Moisture
Regularly check the temperature and moisture levels in the growing environment to ensure optimal conditions.
Avoid Over-Handling
Handle the rhubarb stalks gently when harvesting to avoid damaging the delicate tissue.
Conclusion
Forcing rhubarb is an art that requires patience, attention to detail, and a willingness to experiment. By understanding the process and its benefits, you can unlock the secret to sweet, tender rhubarb stalks, even in the dead of winter. Whether you’re a seasoned gardener or a curious cook, forced rhubarb is a game-changer that will elevate your culinary creations and add a touch of elegance to your table. So, go ahead, give forced rhubarb a try, and discover the magic of this ancient, tart, and tangy vegetable.
What is forcing rhubarb and how does it work?
Forcing rhubarb is a process of growing rhubarb in a controlled environment to promote earlier and sweeter production. It involves potting up the rhubarb crowns in the fall, and then storing them in a cool, dark place until the winter. This process stimulates the plant to grow earlier than usual, resulting in tender and sweet stalks.
In the absence of light, the rhubarb plant focuses its energy on producing stalks rather than leaves. As a result, the stalks grow longer and more slender, with a sweeter and less tart flavor. Forcing rhubarb also allows for a longer harvest period, as the plant can be harvested multiple times throughout the winter and early spring.
Why is forced rhubarb sweeter than outdoor-grown rhubarb?
Forced rhubarb is sweeter than outdoor-grown rhubarb because it is grown in a controlled environment that promotes sweeter production. When rhubarb is grown outdoors, it is exposed to sunlight, which promotes the production of oxalic acid, a compound that gives rhubarb its tart flavor. In contrast, forced rhubarb is grown in the dark, which reduces the production of oxalic acid and results in sweeter stalks.
Additionally, forced rhubarb is typically harvested at a younger stage, when the stalks are more tender and sweeter. Outdoor-grown rhubarb, on the other hand, is often harvested at a later stage, when the stalks are longer and more robust, but also more tart.
How do I prepare my rhubarb crowns for forcing?
To prepare your rhubarb crowns for forcing, you’ll need to pot them up in the fall, about 8-10 weeks before the first frost. Choose healthy crowns with at least one “eye” or bud, and trim back the leaves to about an inch from the crown. Plant the crowns in a deep pot or container filled with a mix of soil and compost, and water well.
Make sure the soil is moist but not waterlogged, and store the potted crowns in a cool, dark place, such as a basement or garage, at a temperature between 32-40°F (0-4°C). Keep the soil moist throughout the winter, and wait for the rhubarb to grow and mature.
How long does it take to force rhubarb?
The entire process of forcing rhubarb can take around 3-4 months. This includes the 8-10 weeks of preparation in the fall, followed by 2-3 months of growth in the winter. The actual growing period will depend on the temperature and conditions of the storage area, as well as the specific variety of rhubarb being used.
During this time, the rhubarb plant will grow and mature, producing stalks that can be harvested multiple times. With proper care and storage, forced rhubarb can continue to produce new stalks throughout the winter and early spring, providing a continuous supply of sweet and tender rhubarb.
Can I force rhubarb in a greenhouse or cold frame?
Yes, you can force rhubarb in a greenhouse or cold frame, as long as you can provide the necessary cool and dark conditions. A greenhouse or cold frame can be a great option if you don’t have a cool, dark space available indoors. Simply pot up the rhubarb crowns in the fall, and place them in the greenhouse or cold frame, where they can grow and mature in the cool, dark conditions.
Make sure to maintain a consistent temperature between 32-40°F (0-4°C), and keep the soil moist but not waterlogged. You can also cover the plants with a layer of black fabric or cloth to block out any light and promote sweeter production.
How do I harvest forced rhubarb?
To harvest forced rhubarb, simply twist off the stalks at the base, making sure to leave at least one inch of stem and leaf attached to the crown. This will encourage the plant to produce new stalks and promote continued growth. Harvest the stalks when they are around 12-18 inches long and about 1-2 inches in diameter, usually after 7-10 weeks of growth.
Be sure to only harvest the stalks, as the leaves of the rhubarb plant contain high levels of oxalic acid and are toxic. Forced rhubarb can be harvested multiple times, as long as you continue to provide the necessary care and storage conditions.
Can I grow forced rhubarb outdoors?
While forced rhubarb is typically grown indoors, you can also try growing it outdoors in a cold frame or shaded area. However, keep in mind that outdoor-grown forced rhubarb may not be as sweet as indoor-grown rhubard, due to the exposure to sunlight and longer growing period.
To grow forced rhubarb outdoors, pot up the crowns in the fall and place them in a cold frame or shaded area, where they can grow and mature in the cool, dark conditions. Make sure to protect the plants from extreme temperatures and wind, and provide them with consistent moisture and care. With proper care, outdoor-grown forced rhubarb can still produce delicious and tender stalks.