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Dormancy, Bolting, and Flowering: What to Do When Rhubarb Changes!

If your rhubarb suddenly “disappears” in winter, shoots up flower spikes, or goes through strange growth cycles, don’t panic—these changes are all part of its natural rhythm. Understanding dormancy, bolting, and flowering in rhubarb means healthier crops, thicker stalks, and a patch that lasts for years. Here’s what to expect and what to do at every stage.

Dormancy: The Disappearing Act

What it looks like:

• Leaves and stalks begin to yellow and flop (usually by late summer/early autumn).
• Within weeks, the plant “vanishes,” with only buds (eyes) at ground level.

Why it happens:

• Rhubarb is a true perennial that survives harsh winters by hiding underground.

What to do:

• Remove yellowed/dead foliage in late autumn; compost or bin diseased leaves.
• Mulch with compost, straw, or leaf mold after die-back (leave the crown exposed).
• Don’t water, fertilize, or disturb during dormancy.
• Plan dividing or moving crowns for late dormancy or very early spring.

Bolting and Flowering: Why and What to Do

What is bolting?

• “Bolting” is when rhubarb sends up tall, fat flower stalks—sometimes with bizarre, frothy buds.
• Common in older crowns (5+ years), after stress (drought, heat, or overcrowding), and in certain varieties (some bolt more than others).

Why does it matter?

• Flowering takes energy away from leaf and stalk production—can mean weaker crops and a drained crown.

What to do:

1. Cut off flower stalks as soon as you spot them.
2. Remove as low as possible, repeating if the plant tries again.
3. After bolting, mulch and water as usual; give the crop a “rest” if lots of stalks were taken.
4. If bolting is frequent: divide the crown next autumn, improve watering/mulch, or switch to a less bolt-prone variety.

Can You Let Rhubarb Flower?

• Leaving one or two flower stalks can add drama to ornamental beds or feed bees (rhubarb flowers are pollinator magnets!).
• Allowing continual bolting year after year may weaken the crowns.
• Never let every plant flower if you rely on regular stalk harvests.

What Else Causes Bolting or Dormancy Changes?

• Overcrowding (divide crowns every 5–7 years)
• Drought or heat stress
• Poor soil or low fertility
• Recent replanting or root disturbance

General Care Tips

• Water deeply in summer dry spells but let plants go dormant as autumn cools.
• Remove all flowering stalks once you’ve enjoyed a few in an ornamental patch.
• Always mulch after autumn clean-up—promotes healthy rest and brilliant spring growth.
• After dividing or moving, let crowns rest a full year before harvest.

Wrapping Up

Dormancy, bolting, and flowering are rhubarb’s natural ways of taking a break, reproducing, or coping with stress. With a little TLC and the right response, your patch will keep supplying crunchy, tangy stalks for generations.