Knowing exactly when do you pick rhubarb is the key to a successful harvest of crisp, flavorful stalks. Rhubarb stalks are typically ready for harvest when they are firm and have reached a length of 10 to 15 inches. Picking at the right time ensures the best flavor and helps your plant stay healthy for years to come.
This guide will walk you through all the signs of readiness, from stalk color to seasonal timing. You will learn the correct technique for harvesting and get answers to common questions about this unique perennial plant.
When Do You Pick Rhubarb
The primary harvest season for rhubarb is spring, but the exact timing depends on several factors. These include your climate, the age of the plant, and the specific variety you are growing. The goal is to harvest when the plant’s energy has produced robust stalks but before it begins to focus on flowering and seed production.
For most gardeners, the window for picking rhubarb opens in mid to late spring. A good rule is to begin checking your plants regularly once daytime temperatures are consistently in the 50s and 60s Fahrenheit. The plant needs this period of cool weather to initiate strong growth.
Seasonal Timing For Rhubarb Harvest
Rhubarb is a cool-season crop, and its harvest period is relatively short compared to summer vegetables. Understanding the seasonal rhythm is crucial for planning your harvest.
The main harvest period lasts for 8 to 10 weeks, usually from April through June in most temperate regions. You should stop harvesting by mid-summer to allow the plant to recover and store energy for the next year. Never harvest all the stalks at once; always leave at least one-third of the plant intact.
Early Spring Indicators
As winter recedes, rhubarb crowns will send up new shoots. These initial stalks may be thinner and more red in color. While tempting, it’s best to let these early sprouts grow and strengthen the plant. The first major harvest usually begins when several stalks on the plant meet the size and firmness criteria.
Peak Harvest Period
The peak harvest time is when daytime temperatures are mild and the plant is growing vigorously. This is when you will get the highest yield of thick, juicy stalks. Consistent picking during this period can actually encourage more production, as long as you follow the proper method.
When To Stop Picking Rhubarb
It is vital to stop harvesting rhubarb by early to mid-July. The plant needs its leaves to photosynthesize and rebuild its root system for the following spring. Continued harvesting late into summer can severely weaken or even kill the plant. Some gardeners also believe stalks become tougher and more acidic later in the season.
Visual And Tactile Signs Of Readiness
Beyond the calendar, your rhubarb plant will give you clear physical signals that it’s time to pick. Use your eyes and hands to assess each stalk individually before harvesting.
Stalk Length And Thickness
The most reliable sign is stalk size. Ready stalks will be 10 to 15 inches long. Thickness is also important; look for stalks that are at least 3/4 of an inch wide at the base. Thin, spindly stalks need more time to mature and develop flavor.
Color And Firmness
Color varies by variety, from deep crimson to green with pink speckles. Regardless of hue, the color should be vibrant, not dull or faded. Give the stalk a gentle squeeze; it should feel firm and crisp, not soft or limp. A firm stalk indicates good water content and texture.
Leaf Development
A fully developed, large leaf is a good sign the stalk is mature. The leaf itself is toxic and should never be eaten, but its size shows the stalk has had time to gather nutrients. Avoid picking stalks with small, just-unfurled leaves.
How To Properly Harvest Rhubarb Stalks
Harvesting rhubarb incorrectly can damage the crown and leave it vulnerable to rot. Pulling or cutting the stalk at the wrong place can harm the plant’s future growth.
Follow these steps for a clean, healthy harvest:
- Identify a mature stalk that meets the size and firmness criteria.
- Grip the stalk firmly at its base, down near the soil line.
- With a gentle twisting and pulling motion, tug the stalk sideways and away from the crown. It should release cleanly from the base. If it resists, use a sharp knife to cut it as close to the crown as possible.
- Immediately trim off the large, poisonous leaf and discard it in your compost or yard waste.
- Place the harvested stalk in a shaded container.
Never harvest more than one-third to one-half of the plant’s stalks at any one time. Always leave plenty of foliage to sustain the plant. After harvesting, you can give the plant a light feeding with compost to support regrowth if you are still within the harvest season.
Factors That Influence Harvest Time
Several key factors can shift your rhubarb harvest earlier or later in the season. Understanding these helps you adjust your expectations based on your specific garden conditions.
Plant Age And Establishment
This is a critical factor. Newly planted rhubarb needs time to establish its root system.
- First Year: Do not harvest any stalks. Allow all energy to go into root and crown development.
- Second Year: You may harvest lightly for 2-4 weeks, taking only the largest, thickest stalks.
- Third Year and Beyond: The plant is fully established. You can harvest normally for the full 8-10 week season.
Geographic Location And Climate
Your local climate dictates the start of the rhubarb season. Gardeners in warmer climates (USDA zones 7 and above) may see an earlier start but a shorter spring harvest window. In cooler climates (zones 3-5), the season may start later but last longer into early summer. Microclimates in your own yard, like a sunny south-facing slope, can also advance harvest by a week or two.
Rhubarb Variety Differences
Different cultivars have slightly different maturation times and characteristics.
- ‘Canada Red’ and ‘Crimson Red’: Known for deep red color and sweet flavor, often ready slightly earlier.
- ‘Victoria’: A common green and pink variety that is very vigorous and productive, with a standard harvest time.
- ‘German Wine’: A green-stalked variety prized for its tartness, maturing at a typical pace.
Check the information for your specific variety when you purchase the crown, as it may note if it’s an early or late-season producer.
Common Mistakes To Avoid When Picking Rhubarb
Even experienced gardeners can make errors in rhubarb harvest. Avoiding these mistakes protects your plant and ensures a better yield.
One major mistake is harvesting too early in the plant’s life. As mentioned, first-year plants must not be picked. Another error is using a knife incorrectly. If you cut the stalk, cut it flush with the crown; leaving a stump can rot and invite disease. The twisting-pull method is often prefered because it removes the entire stalk base.
Do not wait for stalks to become overly large and thick. Stalks over 20 inches long can become pithy, fibrous, and excessively tart. Regular harvesting of stalks at their prime encourages tender new growth. Finally, never harvest after mid-summer. The plant needs to recover, and the oxalic acid content in the leaves migrates into the stalks in higher concentrations later in the year, making them less desirable.
Post-Harvest Handling And Storage
Once picked, proper handling keeps your rhubarb fresh and flavorful. Fresh rhubarb stalks can be stored in the refrigerator for about a week.
To store, wrap the unwashed stalks loosely in a damp paper towel and place them in a perforated plastic bag in the crisper drawer. Do not wash the stalks until you are ready to use them, as moisture can accelerate spoilage. For longer-term storage, rhubarb freezes exceptionally well. Simply wash, trim, cut into 1-inch pieces, and spread on a baking sheet to freeze individually before transferring to freezer bags. This method prevents the pieces from clumping together.
What To Do With Rhubarb Flower Stalks
During the harvest season, your rhubarb plant may send up a thick, central flower stalk. This is a normal process, but it diverts energy from leaf and stalk production.
For the best harvest, you should remove these flower stalks as soon as you see them. Use a sharp knife to cut the flower stalk off as close to the base of the plant as possible. Removing the flower stalk encourages the plant to put its energy back into producing the edible leaf stalks you want to harvest. Letting the plant go to seed can result in a smaller yield of thinner stalks.
Frequently Asked Questions
Here are answers to some of the most common questions about picking and growing rhubarb.
Can You Pick Rhubarb In The First Year?
No, you should not pick rhubarb in its first year of growth. The plant needs that entire first season to establish a strong root system and crown. Harvesting first-year rhubarb severely weakens the plant and can compromise its health and productivity for future years.
How Do You Know When Rhubarb Is Ready To Pick?
You know rhubarb is ready to pick when the stalks are 10-15 inches long, firm to the touch, and have a vibrant color. The leaf at the end of the stalk will be fully opened and large. Gently pull and twist the stalk from the base; if it comes away easily, it is ready.
What Time Of Year Is Best For Harvesting Rhubarb?
The best time of year for harvesting rhubarb is spring, from mid-April through June for most regions. The exact timing depends on your local climate. The harvest season typically lasts 8 to 10 weeks, and you should always stop picking by mid-July to allow the plant to recover.
Is It Safe To Eat Rhubarb After The Plant Flowers?
Yes, it is generally safe to eat the stalks from a rhubarb plant that has flowered, provided you are still within the harvest season (before mid-July). However, you should immediately remove the flower stalk to direct the plant’s energy back to producing edible stalks. The stalks themselves do not become poisonous after flowering, but they may be smaller and less tender if the plant has put energy into seed production.
Can You Pick Rhubarb In The Fall?
It is not recommended to pick rhubarb in the fall. The plant needs its leaves in late summer and fall to gather energy and store it in the crown for next spring’s growth. Fall harvesting depletes these essential reserves and can lead to a weak plant the following year, or even winterkill. For a healthy perennial crop, stick to the spring harvest schedule.