It is also known as the pie-plant.

This is a hardy perennial plant belonging to the smartweed, Polygonaceae is a family of Polygonaceae that is native to Asia.

Rhubarb flowers are primarily grown for their large edible leavestalks or petioles.

Rhubarb can be grown in cooler areas of the temperate zone, which is ideal for its climatic conditions.

The stalk of the plant is fleshy and tart-like.

These stalks can be used as the main ingredient for pies, compotes, preserves, or as the base for a wine or aperitif.

However, the leaves can be toxic and cause serious health problems if ingested.

Rhubarb flowers are usually greenish-white and can be used as ornaments, along with their beautiful, vivid red stalks.

The Rhubarb flower is a subject of some concern.

Scientific Name
Rheum Rhabarbarum
Common Names
Pie Plant
USDA 6 and Higher
Indoor or Outdoor Plant?
Sun Exposure
Part shade to full sun
Regular watering
2- 4 feet
Soil Type
Well-drained, but still moist
Soil pH
6.0 to 6.8
green, red
Growing Difficulty

Characteristics and appearance

Rhubarb plants produce large clumps with enormous leaves that measure up to 60cm or 2ft in diameter.

These leaves are borne on large petioles .

These petioles are formed from an underground stem and measure up to 25 mm in diameter.

It is a perennial herbaceous plant that grows between 2 and 4 feet in height.

The plant grows from large, fleshy reddish brown rhizomes with yellowish interiors.

The hollow stalks of the Rhubarb plant are made from the crown and emerge in the summer.

A few tiny sessile leaves may be found along the length of your stem.

You will find small, greenish-white flowers clustered together in the individual branched Inflorescence.

Each tepal contains six to nine stamens, usually with yellowish or pinkish-green, elliptical and three styles.

It also has angular winged fruit that usually contain one seed.

When ripe, they do not split.

You should not trim the flowers unless you have an immediate need.

The main reason for this is Rhubarb’s flowering, which affects stem production. This is the main source of Rhubarb consumption.

The flower stalks are a waste of time and should be thrown out immediately. They can reduce plant vigor as well as next year’s production.

Dryness, infertile soil and extreme heat are the most common causes of flower-stalk formation.

To discourage flowering, you can water the plant regularly in the summer. Good fertility is also important. You can also mulch around the base to keep it cool and moist.

Only the Rhubarb stalks are edible out of all the parts.

Consuming the leaves can cause severe damage to your mouth and digestive system.

This is why it is important to immediately remove the leaves from the stalks following harvest.

Benefits of Growing Rhubarb Flowers

The large Rhubarb leaves are a standout when it comes to aesthetic purposes, as well as the flowers.

You can also subtly include this edible plant in a garden if it is part of a sunny Rheum-filled flower bed.

It can also be used in desserts and pies, as well as as a complement to savory dishes. T

Because Rhubarb has a tart flavor, it must always be paired with sugar to balance its sweetness.

Rhubarb is a great substitute for lemon juice or vinegar if you enjoy dishes that have a sour flavor.

The stem does contain some of the flower head, and therefore some oxalic acids. However, you should never use excessive amounts of flower heads.

Growing guide

Rhubarb is a fast-growing plant that requires a lot of attention.

You must ensure that you keep the plant clean and the soil moist to prevent overflowing flowers and reducing harvest.


Rhubarb requires regular watering, especially during dry summer months.

Insufficient water can cause slow growth.

This is common in both hot and dry climates.

To avoid waterlogging during the growing season, you should place the plant in containers with good drainage. They dry out more quickly.

Mulch can be applied to retain moisture in the soil.

This will increase the growth in the spring and summer.


Open, sunny areas with plenty of sunlight and light are the ideal conditions for Rhubarb plants to thrive.

You need to be extra careful if you live in extremely cold regions. Frost can cause damage to your plants.

Make sure you choose a location with good sun exposure, such as the west.

Although the Rhubarb plant thrives in full sunlight, it can also be grown in partial shade.


Rich organic soil is essential for Rhubarb plants. In spring, mulch well-rotted garden compost to ensure a healthy environment.

It is better if it is at least 7cm thick or 2 1/2 inches in depth.

This should be done around the plant, but not in the crown.

Mulch retains moisture in the soil.

Three fertilizations per year are recommended to get the best Rhubarb stem yields.

Temperature and humidity

Cool temperatures below 75 degrees F are ideal for Rhubarb plants, especially in springtime.

Rhubarb plants can be found in April or May depending on where they are located. Sometimes, even through the summer.

It can be grown indoors or in a heated greenhouse.

After allowing the leaves to fall naturally in autumn, remove the old leaves and expose them to the cold of winter.

The poisonous oxalic acid found in the leaves will be broken down as they decay during decomposition.

It needs to experience temperatures below 3degC (37degF) for 7-9 weeks.

Potting and repotting

The Rhubarb root should be planted at least 3 feet apart.

The buds should be kept at least 2 inches below the soil surface.

The stalks should be harvested in the second or third years, so that the roots can grow.

After spring arrives, and the growth has begun, fertilize the plants. Then, repeat the process in the summer following harvest.

To keep your leaves strong, remove the flower stalks as soon they appear.

Mulch can also be used in winter to prevent heaving.

You must give each plant enough time to grow food so it can produce strong stems.

The second year is the best time to harvest older leaf stalks. Grab them near the main part of your plant at the lower end.

Pull down on one side to allow the stalk to snap off.

To prevent the plant from starving, keep some leaves on the plant.

Propagating and Pruning

Rhubarb can produce a lot of seeds if it is allowed to flower.

Although it can be propagated by seeds, it is most commonly done through divisions made in spring about 4 to 6 weeks prior to the average date for the last frost.

Use a spade, or shovel to cut the crown into pieces. Leave at least one strong flower for each piece. Rhubarb plants from seeds are slower than those grown from crowns and offer more variables.

You can sow seeds indoors or outdoors in March or April. Rake the area to be sown. Sow the seeds 1 inch deep. Thin the seedlings to 6 inches apart.

Water your plants well and water them regularly. Do not trim all of the leaves when they are ready to be harvested as this could deplete their energy.

Common Problems, Diseases, And Pests

Some common issues faced by this plant are crown-rot, snail or slug infestation.

Many soil- and water-borne bacteria and fungi can make plants sick. This can affect their growth and cause them to rot at their crowns.

Remove the affected tissue and replace it with healthy tissue.

Beer traps, eggshell or sawdust barriers, copper tape and biocontrols can be used to control the slugs.


These are some frequently asked questions about Rhubarb:

Is Rhubarb safe to use after it flowers?

Yes, but only after the flowers have been removed.

What is Rhubarb flowering?

Rhubarb flowers when it is not receiving enough fertility or is under stress

Which part of Rhubarb can be considered poisonous?

The leaves are poisonous because they contain oxalic acid.