When and How to Harvest Rhubarb

Growing rhubarb, Rheum rhabarbarum, is not for those who lack patience.

Compared to something like a carrot, which you can enjoy just 60 to 75 days after planting, pie plant takes months. Often one year. Sometimes two or three.

But oh, when you finally bite into that heavenly slice of rhubarb pie, crisp, or crumble, the wait will have been beyond worthwhile.

This means that if you haven’t ever grown rhubarb before, you should start now. Check out our complete guide to growing rhubarb to get started.

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While you eagerly wait for your stalks, or petioles, to grow large enough for picking, let’s learn all about when and how to harvest rhubarb.

Here’s what I’ll cover:

When to Harvest Rhubarb

There are many ways to plant: from seed, crown, bare root, or division. And you if you don’t have space in your garden, you can always grow rhubarb in containers.

We cover this in more detail in our guide to rhubarb varieties. But each planting method has different harvest specifications, so let’s find out what that’s all about.

From Divisions: The Quickest Way to Home-Grown Stalks

Divisions are taken from rhubarb plants that are either about to go dormant for the winter, or about to leave the days of dormancy behind.

If you’re lucky enough to score a division from a friend, you’ll get to enjoy your own tart stalks come springtime.

This is because divisions are already mature plants that will produce stalks easily. The yield depends on how large the root section is.

(Hint: the larger it is, the more pie plant stalks you’ll get to harvest!)

So don’t be shy. Ask your rhubarb-laden gardening friends if you can take a nice chunk home to your own garden.

You’ll know stalks are mature when they’re at least 12 inches long. Don’t worry about the color: a green stalk does not mean the plant isn’t ready.

It simply means you chose a green-stalked variety, like ‘Victoria’ often is, or ‘Riverside Giant.’

Bare Root: The Second-Fastest Way

A bare root is basically a dormant division purchased from a nursery and it’s usually a lot smaller than a division you’d get from a friend.

For this reason, it’s best to leave bare roots alone during their first season after you plant them. They’ll produce stalks, but the plants are small and often a lot younger than the massive spread in your friend’s garden.

From a Crown: Also the Second-Fastest Way

A crown is a small plant that’s at least a year old. You’ll often find these in your local nursery, chilling out in the planters where they were born, ready for transplant into your garden.

While you can technically tug one or two slim, short stalks from your plant the day you bring it home, it’s best to leave it alone for a full year after planting.

This gives it the time to get established.

Sowing Seeds: The Slowest Way

It may be two to three years before you get to pick rhubarb planted from seed, but don’t knock this method completely because it is fun.

Here in Alaska, I’m used to seeing huge clumps of rhubarb all over the place come summertime.

But when I start pie plant from seed, I get to watch the transformation from papery seed, like this:

To four-week-old seedling, like this, and beyond:

Isn’t it miraculous that this tiny plant grows up to four feet tall and wide, depending on the variety? That the humble stalks become the dazzling star of so many sweet dishes?

Call me strange, but I feel a bond with these little plants. I’ve known them for so long, and once they’re planted against my red barn, I’ll smile and remember when I held them in my palm in seed form.

Think of planting from seed like planting from a crown but with an extra year or so tacked on. You’ll need to wait until the seedlings become crowns, and then another year until the crowns produce big enough stems for very light picking (1/4 or less of the plant).

What Time of Year to Harvest

No matter which planting method you choose, the actual months of harvest season remain the same.

It all depends on your USDA Hardiness Zone.

In the Pacific Northwest, Alaska, and the Midwest –ƒ Zones 2-6 – you can typically pick rhubarb all the way from April to early July.

Take the first harvest when stalks mature in April, leaving 1/2 to 3/4 of the petioles intact.

After another month or two, new petioles should have grown to replace the ones you harvested. Again, take 1/2 to 1/4 of the petioles, leaving the rest.

For the rest of the summer, allow the plant to grow untouched. This will help it store up nutrients for winter sustenance, ensuring that you get a healthy crop the following spring.

In Zones 7 and 8, winters are milder. You’ll be able to get your plants in the ground sooner, and they’ll mature more quickly.

Pick from March through May in these Zones, leaving the plants alone in their hopefully semi-shaded area to weather out the rest of the summer and store energy for the winter.

Picking time is even earlier if you’re growing rhubarb as an annual in Zones 9 or above.

You’ll have sown seeds indoors in August and planted them (or potted crowns) outside by October. In this case, you can pick them from about February to April.

Take just 1/4 of the stalks earlier in the season, leaving the rest behind to get stronger and bigger. But in April, go ahead and harvest every single stalk.

After April, your plants will probably perish in the summer heat. And you’ll start the process all over again in August.

Best Time of Day to Harvest

I have visions of heading out to my cool, early-summer garden in the morning and plucking stalks for my breakfast crumble.

Or weaving my hand through the plant to find the juiciest petioles in the evening for a spur-of-the-moment pie.

But the truth is, you can pick rhubarb at any time of the day.

It may prefer being plucked away from its mother plant in the cooler hours of the morning or evening, but stalks won’t lose their crispness if you pick them in the heat of the day – as long as you bring them indoors right away.

Knowing When Stalks Are Ready

Still worried about how to know when stalks are ripe and ready?

All you need to remember is that they should be at least 12 inches long. It’s also nice for your plant if you wait until there are about 10 stalks on a plant, so that when you harvest about 1/4 to 1/2, at least 5 to 7 stalks remain.

Here’s the rule to follow: if your plant has fewer than 10 petioles but they are all ripe, harvest no more than two to four.

It helps if you have several plants from which to take one or two stalks apiece, leaving the rest to grow for a while longer before you collect again later in the season.

How to Harvest

The only tools you need are your own two hands. While you can technically use a garden knife, stalks are often so close together that you might accidentally slice into a petiole you didn’t mean to nick.

If you do choose to use a knife, find the bottom of the petiole with your hand, pull it away from the other stalks, and gently cut downward.

Or, take the easier and safer route of simply gripping the middle of the stalk with both hands and then twisting and pulling at the same time.

The end of the stalk will have a tapered, papery portion.

Go ahead and cut that off.

While you’re at it, snip the leaves off, too, and take them to your compost pile – or the garbage.

Just make sure they stay out of reach of children and animals, as the leaves are toxic.

Preserving Stalks

By the time three or four years have passed since you first planted rhubarb, you’ll have so much that you probably won’t be able to use it all at once.

Freshly picked rhubarb will stay fresh in the refrigerator for about a week as long as it’s kept in a zip top bag or other airtight container. If you just stick it in the fridge as is, it’ll dry out.

To keep rhubarb around even longer, freeze it!

All you have to do is slice the stalks into one-inch pieces, set them on parchment paper, and place them in the freezer until they’re firm.

Then move them to date-marked freezer bags, where they’ll keep in your freezer for up to a year.

What To Do If Rhubarb Bolts

You can usually catch seed heads before they turn into full-on flowers. They’ll usually emerge from the base of the plant, green and bulbous.

The stalks that seed heads grow on are usually tougher than edible stems, so you’ll need to take a sharp knife and cut them as close to the base of the plant as possible.

This is the case whether you catch the seed head in its early stages or you end up needing to remove a tall stalk with several seed heads.

If you let your plant go to flower, the edible stems will taste the same and your plant will still live for many more years.

But since all the energy is poured into creating seeds, you won’t get to pick nearly as many stalks.

Now Go Make Some Rhubarbalicious Treats!

Now that you know how to pick pie plant, it’s time to plan those pies. And wines. And crumbles, cakes, jams, and ice creams.

And if you need further inspiration, our sister site, Foodal, has plenty of ideas for what to do with your fresh harvest.

We’d love to know: what’s your favorite rhubarb treat? Mine, of course, is pie. But when my seedlings turn into big strong plants and I get to harvest homegrown stalks, you bet I’ll be trying every recipe I can find.