蜜桃恋人

How to Grow Rhubarb Plants: The Complete Guide

Botanical Name
Rheum rhabarbarum
Plant Type
Vegetable
Sun Exposure
Full Sun
Part Sun
Soil pH
Neutral to Slightly Alkaline
Slightly Acidic to Neutral
Hardiness Zone
3
4
5
6
7
8

Also receive the 蜜桃恋人 Daily newsletter including gardening tips, weather, astronomical events, and more.

No content available.

Planting, Growing, and Harvesting Rhubarb

Catherine Boeckmann

What grows for ten years or more, suffers from almost no pests, and is refreshingly easy to care for? It’s rhubarb! This perennial vegetable has tart-flavored ruby or green stems used to make pies, crumbles, cakes, jams, and sauces. Learn how to plant, grow, and pick rhubarb correctly.

About Rhubarb

Rhubarb originally came from Asia. It was brought to Europe in the 1600s and to America shortly thereafter. It thrives in areas with a cooler climate, making it popular in northern gardens. Rhubarb is easy to grow but needs a dormancy period to thrive and produce an abundance of huge stalks. Rhubarb does best where the average temperature falls below 40潞F (4掳C) in the winter and below 75潞F (24掳C) in the summer.

The stalks are the only edible part of the rhubarb plant. These have a rich, tart flavor when cooked. The leaves of the rhubarb plant are toxic. They contain an irritant called oxalic acid, so be sure that they are not ingested.

What’s lovely about rhubarb is that it’s a perennial: A healthy plant will remain productive for 10 years or more. For that reason, rhubarb should be planted in its own space in any corner of the garden where it can grow undisturbed. Rhubarb grows well in soil amended with plenty of well-rotted manure or compost; this has inspired some gardeners to plant it near their compost piles!

With its ruby or green stems and umbrella-like leaves, rhubarb also adds height and structure to your garden, along with a splash of gorgeous color that will return year in and year out. 

Read Next

Planting

Rhubarb grows best in full sun but will tolerate partial shade.

Choose a site with soil that is well-draining and fertile. Good drainage is essential, as rhubarb will rot if kept too wet. Mix compost, rotted manure, or anything high in organic matter into the soil. Rhubarb plants are heavy feeders and need this organic matter. Learn more about soil amendments and preparing soil for planting.

Rhubarb gets big! It can grow to 2 to 3 feet tall and wide. Make sure you choose a site where it won鈥檛 be crowded. 

When to Plant Rhubarb

  • Rhubarb can be planted in late fall or early spring.
    • Plant rhubarb crowns after dormancy have set in in the fall, and you鈥檒l have rhubarb cropping in the spring!
    • In spring, plant crowns when the soil is workable, when the roots are still dormant, and before growth begins (or as plants are just beginning to leaf out). If you have a temperature gauge, soil temperature should be 50掳F minimum.

How to Plant Rhubarb

  • Plant 1-year-old rhubarb crowns, which you can find at a garden center, or nursery, or order online. Plants will be sold as bare-rooted specimens or young plants already growing in pots, ready for transplanting. (Rhubarb can be grown from seed, but this is not recommended.)
  • Before planting, eliminate all perennial weeds in the planting site.
  • Dig large, bushel-basket-size holes.
  • Space rhubarb plants about 2 to 4 feet apart and 3 to 4 feet between rows.
  • Plant crowns so the eyes are about 2 inches below the soil surface with buds facing up.
  • Water well at the time of planting.

Check out this video to learn more about how to plant rhubarb:

Growing

Overcrowding is a common problem with rhubarb and can lead to subpar growth. Dig and split rhubarb roots every 3 to 4 years. Divide when plants are dormant in early spring (or late fall). Divisions should have at least one large bud on them. 

  • Mulch generously with a heavy layer of straw to retain moisture and discourage weeds.
  • Water your plant well and consistently. Rhubarb needs sufficient moisture, especially during the hot, dry summer days. 
  • Remove seed stalks as soon as they appear, as they will only drain energy from the plant that could be used to produce stalks or roots.
  • Each spring, apply a light sprinkling of a fertilizer (10-10-10) when the ground is thawing or has just thawed. See your local frost dates.
  • In the fall, remove all plant debris. Once your ground freezes, it鈥檚 best to cover rhubarb with 2 to 4 inches of organic mulch, preferably well-rotted compost. By adding nitrogen to the soil, you鈥檙e preparing the rhubarb plants for a good spring season.

Rhubarb leaf

Types

These common varieties have attractive red stalks and excellent growers: 

  • 鈥楥补苍补诲补&苍产蝉辫;搁别诲’
  • 鈥楥谤颈尘蝉辞苍&苍产蝉辫;搁别诲’
  • 鈥楳补肠顿辞苍补濒诲’
  • 鈥榁补濒别苍迟颈苍别’

In addition to the previous four, there is a reliable, green-stalked cultivar named:

  • 鈥榁颈肠迟辞谤颈补’

Harvesting

Do NOT harvest any stalks during the first growing season. Harvest sparingly in the second year. This allows your plants to become properly established.

  • After a plant’s third year, the harvest period (rhubarb season!) runs 8 to 10 weeks long, lasting through mid-summer.
  • Harvest stalks when they are 12 to 18 inches long and at least 3/4-inch in diameter. If the stalks become thin, stop harvesting; the plant’s food reserves are low.
  • Grab the base of the stalk and pull it away from the plant with a gentle twist. If this doesn’t work, you can cut the stalk at the base with a sharp knife. To prevent the spread of disease, be sure to sanitize the knife before cutting. Discard the leaves.
  • Always leave at least two stalks per plant to ensure continued production. You may have a bountiful harvest for well over ten years without replacing your rhubarb plants.
  • It was once believed that the entire rhubarb plant became toxic as summer temperatures rose. This isn’t true, although summer-harvested stalks usually have a tougher texture than those picked in the spring. Nevertheless, after mid-summer (July), it’s best to leave stalks on the plant to allow them to gather energy for next year’s growth.

How to Store Rhubarb

Cut the rhubarb stalks and refrigerate in a covered container. Or, tightly wrap stalks in plastic or aluminum foil and refrigerate. Rhubarb can be kept fresh in the refrigerator for a couple of weeks.

Cut rhubarb stalks into pieces, place them in a covered container or zip-type plastic bag, and put them in the freezer. Frozen rhubarb will last about a year.

Gardening Products

Wit and Wisdom

Rhubarb has many other uses, from medicinal to cosmetic. See how to naturally lighten your hair with rhubarb. 

Pests/Diseases

Pests and diseases are rarely an issue with rhubarb, but they may be affected by the following problems.

Rhubarb Pests and Diseases
Pest/DiseaseTypeSymptomsControl/Prevention
Botrytis (gray mold)FungusVaries; yellow/ brown/gray spots with water-soaked margins on leaves/flowers; gray mold; buds remain closed; stem lesions; wilt/rot; scorched appearance (鈥渇ire鈥) in some plantsDestroy infected parts/severely infected plants (do not compost); remove plant debris regularly; disinfect tools; good air circulation/sunlight; avoid overhead watering; prevent plant stress/injury; weed; rotation
Fungal leaf spotFungusVaries; leaf spots on lower leaves enlarge and turn brown/black; fuzzy growth or pustules in lesions; disease progresses upward; leaves dieDestroy infected leaves/ severely infected plants (do not compost); remove plant debris regularly; disinfect tools; resistant varieties; good air circulation; avoid overhead watering
Phytophthora crown and root rotOomyceteLeaves discolor/ wilt; dieback; oozing cankers near base; reddish brown discoloration of inner bark/wood; roots rot; plants slow-growing/stunted/dieDestroy infected plants and surrounding soil (do
not compost); prune out branch cankers; remove plant debris regularly; plant resistant varieties; prevent plant stress/injury; provide good drainage/do not overwater
Rhubarb curculioInsectWeevil-like beetle that bores into stalks/crowns; notches on stalks/leaves; holes in stalks leak sap; plants wilt/decayHandpick adults (appear in mid-May); destroy nearby host plants (sunflowers, thistle, dock) in mid-summer (July)
Slugs/snailsMolluskIrregular holes in leaves; slimy secretion on plants/soil; young stems 鈥渄isappear鈥Handpick; avoid thick bark mulch; use copper plant collars; avoid overhead watering; lay boards on soil in evening, in morning lift and dispose of pests in hot, soapy water; drown in deep container of 1/2 inch of beer or of sugar water and yeast sunk to ground level; apply 1-inch-wide strip of diatomaceous earth

Recipes

Apple-Rhubarb Crunch
Rhubarb Chutney Recipe
Rhubarb Nut Bread
Strawberry-Rhubarb Pie
Blueberry-Rhubarb Jam
Rhubarb Upside-Down Cake

Cooking Notes

Check out our list of best rhubarb recipes to put your fresh rhubarb to good use! Plus, learn how to make a rhubarb tonic.

Vegetables
About The Author

Catherine Boeckmann

Catherine Boeckmann loves nature, stargazing, and gardening so it鈥檚 not surprising that she and The Old Farmer鈥檚 蜜桃恋人 found each other. She leads digital content for the 蜜桃恋人 website, and is also a certified master gardener in the state of Indiana. Read More from Catherine Boeckmann
 

More Like This

Comments

Jenny (not verified)

6 years 4 months ago

I am in the UK, under going the hottest summer since 1976. Have grown rhubarb for years. Recently ordered new plants from well established plant company expecting them to arrive later in the season.
They arrived yesterday, 24 July, fully leafed and a bit bedragled. They have
revived over night but my conumdrum is should I plant them now or leave them in the pots and plant them in the autumn as your planting calendar suggests? Jenny. Thanks

We would opt for autumn, Jenny, if you can keep the plants in relatively good condition. They may begin their seasonal decline into dormancy鈥攖hat is, appear to fail to thrive鈥攂ut should transplant successfully. (in advance of any problems, you might share your expectations with the company from which you purchased the plants…just in case you need/want a replacement.)

I am also in the UK but in the north and would advise to plant as soon as you get the rhubarb plants. This year I have had a bumper crop
without doing anything at all and am just about to pull the remaining stalks and throw them out. Best to just leave it alone
and let it multiply. I have no more room left in freezer for mine this year it did so well. No need to feed it but requires plenty
of rain which we usually have here.

Lindsay (not verified)

6 years 4 months ago

Hi there! We just moved into a house with a large rhubarb patch. Not sure how old/established it is, but at least a couple of years (probably more). We harvested some good sized stalks earlier this year, but now noticing that there are numerous, spindly stalks. It's been hot, now early July, so I'm not sure if I need to split the plant in the fall, or just let it rest for the month? Any advice is appreciated!
Thanks

Jean Madsen (not verified)

6 years 4 months ago

Remove the tall spindly stalks now. They stuck the nutrients out of your Rhubarb patch. Never allow that to grow in your garden.

Jennifer (not verified)

6 years 5 months ago

Is this common? Our neighbour gave us a nice clump of rhubarb to plant a few years ago. That first year it flowered, but has not flowered since (maybe 3 years?). Does this plant require another nearby?

A rhubarb plant can flower for a few reasons—certain varieties flower more often, and the older the plant is, the more often it may flower. Flowering can also be a sign of stress, such as perhaps was the case when you had first planted it (I’m guessing the transplant was a relatively older plant, not a baby). Warm temperatures may also cause it to flower. Many gardeners prefer to remove the flower stalks as they appear so that the plant can focus on developing leaves and leaf stalks. The fact that your plant hasn’t flowered since planting may indicate that it is happy and healthy! As it gets older, you may see some flowers develop again.

Carol Rinko (not verified)

6 years 5 months ago

I have several plants that I took from my mother's house after she passed. They are in pots now and I have had them a couple years now. When do they go dormant and when is the best time to plant into the ground?

The best time to plant rhubarb is in early spring or in the fall. They go dormant in the fall and through winter. See above for additional guidance.

Tom Robinson (not verified)

6 years 5 months ago

I have been told that you should not harvest and eat, rhubarb after the 4th of July, as the stalks may become poisonous. I was also just told, that you should not harvest and eat, if the plant has flowered / seed stalks. Are either of these true?