When To Plant Rhubarb

Rhubarb crowns thrive when planted in early spring while the ground is still cool. Knowing exactly when to plant rhubarb is the first step to a bumper crop of tangy stalks. This guide covers everything from soil temperature to regional timing, so you get it right the first time.

Rhubarb is a hardy perennial that rewards patience. Plant it once, and you can harvest for a decade or more. But timing matters more than most people think. Get the planting window wrong, and your crowns may rot or fail to establish.

Let’s break down the best times, methods, and common mistakes. You’ll have a clear plan by the end of this article.

The ideal window for planting rhubarb is early spring, as soon as the soil is workable. In most climates, this means March or April. The ground should be cool but not frozen, and temperatures should stay above 40°F (4°C) at night.

Why early spring? Rhubarb needs a period of cold dormancy to produce strong stalks. Planting in cool soil encourages root growth before the heat of summer. If you wait too long, the plant struggles to establish before hot weather arrives.

For fall planting, aim for 4–6 weeks before the first hard frost. This gives roots time to settle in. Fall planting works best in mild winter regions where the ground doesn’t freeze solid.

Soil Temperature Guidelines

Check your soil temperature with a simple thermometer. Rhubarb roots grow best when the soil is between 40°F and 50°F (4°C to 10°C). If the soil is warmer than 60°F (15°C), delay planting until it cools down.

Ideal soil temperature: 40–50°F
Too cold: Below 35°F (frost heave risk)
Too warm: Above 60°F (poor root development)

You can warm the soil by covering it with black plastic for a week before planting. This is handy if you’re eager to start in early March.

Regional Planting Times

Your location changes the calendar. Here’s a quick guide:

Northern zones (3–5): Plant in early to mid-April, as soon as soil thaws.
Central zones (6–7): Plant in late March or early April.
Southern zones (8–9): Plant in February or early March, or in October for fall.
Coastal areas: Plant in early spring after the last frost.

If you’re unsure, check your local frost dates. Plant rhubarb 2–4 weeks before the last expected frost. This gives it a head start.

Choosing The Right Rhubarb Variety

Not all rhubarb is the same. Some varieties are better for early harvests, while others resist disease. Pick a variety that matches your climate and taste.

Popular Varieties

Victoria: Classic green-stalked variety, reliable and productive. Good for beginners.
Canada Red: Deep red stalks, sweet flavor. Ideal for pies and jams.
Timperley Early: Very early harvest, tender stalks. Perfect for northern gardens.
Glaskin’s Perpetual: Produces over a long season, less likely to bolt.

Choose a variety that suits your planting window. Early-season types like Timperley Early should be planted as soon as the ground is workable. Late-season types can wait a few weeks.

Preparing The Planting Site

Rhubarb is a heavy feeder. It needs rich, well-draining soil with plenty of organic matter. Prepare the bed at least two weeks before planting.

Soil Preparation Steps

Choose a sunny spot with at least 6 hours of direct sunlight daily.
Remove all weeds, especially perennial roots like dandelions.
Dig the soil to a depth of 12–15 inches.
Mix in 2–4 inches of well-rotted compost or aged manure.
Add a balanced fertilizer (10-10-10) at a rate of 1 cup per 10 square feet.
Rake the bed smooth and water it deeply.

If your soil is heavy clay, consider building a raised bed. Rhubarb hates waterlogged roots. Good drainage is non-negotiable.

Planting Rhubarb Crowns

You can plant rhubarb from crowns (dormant roots) or seeds. Crowns are faster and more reliable. Seeds take two years to produce harvestable stalks.

Step-By-Step Planting Guide

Dig a hole about 12 inches wide and 6 inches deep.
Place the crown in the hole with the buds facing upward.
Cover the crown with 1–2 inches of soil. Do not bury it deeply.
Space crowns 3–4 feet apart to allow for mature growth.
Water thoroughly after planting.
Add a 2-inch layer of mulch to retain moisture and suppress weeds.

If you’re planting multiple rows, space rows 4–5 feet apart. This gives you room to walk and harvest.

Planting Rhubarb From Seed

Seeds take longer but are cheaper. Start seeds indoors 8–10 weeks before your last frost. Transplant seedlings outdoors when they have 3–4 true leaves.

Sow seeds 1/2 inch deep in seed-starting mix.
Keep soil moist and warm (70°F).
Harden off seedlings for a week before transplanting.
Space seedlings 2 feet apart, then thin to 3 feet later.

Expect to wait two years before your first harvest from seeds. Crowns give you stalks in the first year (if planted early enough).

Caring For Newly Planted Rhubarb

After planting, rhubarb needs consistent care for the first year. This sets the stage for future harvests.

Watering

Keep the soil evenly moist but not soggy. Water deeply once a week if there’s no rain. In hot weather, water twice a week. Mulch helps retain moisture.

Fertilizing

Feed rhubarb in early spring with a balanced fertilizer. Apply 1/2 cup of 10-10-10 per plant, scattered around the base. Water it in well. Avoid high-nitrogen fertilizers, which produce leafy growth at the expense of stalks.

Weeding

Keep the bed weed-free. Weeds compete for nutrients and water. Hand-pull weeds carefully to avoid disturbing the shallow roots.

First Year Harvest Rules

Do not harvest any stalks in the first year. Let the plant build energy for strong roots. In the second year, you can harvest lightly—take only 1–3 stalks per plant. By the third year, you can harvest fully.

Common Planting Mistakes

Even experienced gardeners make errors. Here are the most common ones:

Planting too deep: Crowns buried more than 2 inches rot easily.
Planting too late: Summer heat stresses young plants.
Overcrowding: Rhubarb needs space; crowding reduces yield.
Poor drainage: Wet roots cause crown rot.
Harvesting too soon: First-year harvest weakens the plant.

Avoid these pitfalls, and your rhubarb will thrive for years.

Extending The Planting Season

If you missed the spring window, don’t worry. You can still plant rhubarb in early fall. The key is timing it right.

Fall Planting Tips

Plant 4–6 weeks before the first hard frost.
Water regularly until the ground freezes.
Mulch heavily with straw or leaves after the first frost.
Remove mulch in early spring to allow new growth.

Fall-planted rhubarb may produce a small harvest the following year. Be patient and let it establish.

Growing Rhubarb In Containers

Short on space? You can grow rhubarb in large containers. Use a pot at least 18 inches deep and 24 inches wide. Fill it with rich potting soil mixed with compost.

Plant one crown per container. Water frequently, as pots dry out faster. Move the container to a sheltered spot in winter to protect the roots.

Container-grown rhubarb needs more fertilizer. Feed every 4–6 weeks during the growing season with a balanced liquid fertilizer.

Harvesting Rhubarb

Once your plants are established, harvesting is straightforward. Wait until stalks are at least 12 inches long and thick. Grasp the stalk near the base and pull it gently while twisting. Do not cut the stalks; pulling encourages new growth.

Harvest only 1/3 of the stalks at a time.
Stop harvesting by mid-summer to let the plant recharge.
Remove flower stalks as soon as they appear to direct energy to the roots.

Never eat rhubarb leaves—they are toxic due to oxalic acid. Only the stalks are edible.

Winter Care For Rhubarb

Rhubarb goes dormant in winter. In cold climates, protect the crown with a thick layer of mulch. Use straw, leaves, or wood chips. In mild climates, a light mulch is enough.

Remove mulch in early spring when new shoots appear. This allows the soil to warm up quickly.

Frequently Asked Questions

Can I Plant Rhubarb In Summer?

Summer planting is risky because heat stresses young plants. If you must plant in summer, choose a cloudy day and water daily. Expect slower establishment.

How Long Does Rhubarb Take To Grow From Seed?

From seed, rhubarb takes about 2 years to produce harvestable stalks. Crowns give you stalks in the first year if planted early.

What Happens If I Plant Rhubarb Too Deep?

Planting too deep causes the crown to rot. Always cover the crown with no more than 2 inches of soil. The buds should be just below the surface.

Can I Transplant Rhubarb In Spring?

Yes, early spring is the best time to transplant rhubarb. Dig up the crown carefully, divide it if needed, and replant immediately. Water well.

Does Rhubarb Need Full Sun?

Rhubarb grows best in full sun (6+ hours daily). It tolerates partial shade but produces thinner stalks. For best yields, choose a sunny spot.

Final Tips For Success

Planting rhubarb at the right time is half the battle. The other half is patience. Let the plant establish in its first year, and you’ll be rewarded with years of harvests.

Keep the soil rich, water consistently, and mulch well. Remove flower stalks promptly. With these steps, your rhubarb patch will thrive.

Remember the golden rule: plant early, plant shallow, and plant with space. Your rhubarb will do the rest.

Now you know exactly when to plant rhubarb. Get your crowns, prep the soil, and start your patch today. You’ll be enjoying homegrown rhubarb pie before you know it.