Food & Drink, Vegetable Garden

Rhubarb…. growing, caring for and eating

April 16, 2024

How to Grow Rhubarb

How to Grow Rhubarb

Love it or hate it, rhubarb been around for centuries and was originally grown for its medicinal properties. There are many varieties with stem colours ranging from green to pink to red, and a green stalk doesn’t necessarily mean a sour stalk.

Breaking dormancy

Rhubarb is a perennial crop (all being well it will keep growing back year after year) and prefers a cooler climate, needing temperatures of below 5°C to break its dormancy and no more than 24°C to produce lots of growth, making it an ideal vegetable to grow in Ireland. Once planted it can stay productive for up to 15 years.

Soil conditions

Along with many plants, rhubarb prefers fertile, well-drained soil with lots of organic matter dug in, preferably in a sunny spot. A sprinkling of a seaweed fertiliser full of micro and macro nutrients around the stems in the spring (taking care to keep it clear of the crown) will improve the yields. Likewise a shovel full of well-rotted manure or composted leaves applied in the autumn (taking care not to cover the crown which may encourage it to rot) will benefit the plant greatly. Rhubarb also prefers to grow in slightly acidic soil with a pH of around 6 – 6.8.

How to Plant Rhubarb

Rhubarb in springRoots should ideally be planted in the early spring, and if you want more than one plant, space them around 60-120cm (1 – 2′) apart.  Dig a large hole and mix in lots of well rotted organic matter.

Plant the roots with the crown bud 5cm (2″) below the surface of the soil, firming the soil around the roots but keeping it loose over the buds, watering in the crowns after planting.

Don’t forget about it once it’s in, although it’s a tough, hardy plant it still needs some care and attention… water your rhubarb in dry spells and remove the flower stalks as soon as you see them, usually in the spring (they look quite different from the stems), and keep weeding around it.

When to Pick Rhubarb

During the first year of growth, don’t pick the stalks as the leaves on the plant will nourish the roots for the following year’s growth. During the second year, and only if the plant is growing well, you can pick a few stalks. After that the whole plant can be harvested.

To harvest rhubarb just cut the stalks at the soil line or pull them out one at a time, either taking them all out or just as you need them, usually between April and late June.

Is rhubarb poisonous?

Once the stalks have been cut, remove the leaves which contain oxalic acid and can cause kidney problems if raw or cooked leaves are eaten. Like many vegetables, the stems also contain oxalic acid, but to a much lesser degree and they are considered perfectly safe for consumption. If the plant is hit by frost and the stems seem soft and mushy, don’t eat them, send them to the compost heap instead.

Although the leaves can be dangerous if they’re eaten, it’s okay to compost them… they’ll decompose and breakdown in the heap without causing any problems.

Some people like to force rhubarb, giving an earlier crop, but personally I’ve always left it to develop naturally.

Rhubarb Recipes

There are many recipes using these delicious stalks, rhubarb crumble wins hands down in our household every year, although I did taste a delicious rhubarb cake last year as well as a divine roasted rhubarb cheesecake.

The inspiration for this blog post though goes to Sarah with her excellent blog Cake in the Country, packed full of great recipes. Her latest post was for Rhubarb Lemonade, a drink I’ll be recreating in the next few days (and maybe even try it with a wee drop of alcohol).

Rhubarb Lemonade Recipe:

4 sticks of rhubarb chopped roughly
About a 3/4 cup of sugar
Juice of 1.5 lemons
Zest from 3/4 of one lemon
about a cup or so of water. Just enough to cover the rhubarb in a large saucepan which will make a rhubarb lemony syrup.)

Place everything in a pan and add the water as above. Bring to the boil and simmer for about 8-10 mins until all the rhubarb has broken down. Taste it. If you like lemonade zingy and tart, you might want to add some more sugar and give it another minute or two to dissolve.

Strain through some muslin (or a clean nylon stocking) and sieve into a container (or for keeping in a sterilised jar) Sarah wrote a blog on sterilising here.

“The rhubarby mush is perfect for stirring into yoghurt or your porridge in the morning!” Let it cool. This is a concentrated syrup. Sarah used about 1/3 of a glass of this syrup poured over lots and lots of ice and top it up with water or sparkling water for some fizz.  Taste to test and add more syrup or water as you need!”

How do you like your rhubarb?


  • Reply Bridget May 9, 2011 at 4:28 pm

    Hmmm, nice idea, will try it.

  • Reply greensideupveg June 17, 2013 at 9:07 pm

    It’s yum!

  • Reply 5 reasons why we should eat 'in season' (& eat rhubarb cake too!) September 12, 2014 at 11:23 pm

    […] Mona Wise published in her newspaper column last year for rhubarb cheesecake and another from Sarah of Cake in the Country for rhubarb lemonade that’s very refreshing at this time of year. There are instructions on the latter post too for […]

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