Best Fertilizer For Rhubarb & Growing Guide

Who doesn’t love Rhubarb right? As long as you don’t confuse Rhubarb as a weed, this tangy flavored treat is excellent for making jams and pies and is loved by people all over the world. Rhubarb loves to grow in zones where the ground freezes over the winter months. For a harvest of Rhubarb stems, they need a period of time when the temperature gets below 40 degrees. So anything Zone 7 and above will be good for growing Rhubarb.

But when we examine our Rhubarbs, we start with the stem. We begin by determining how long it is or how red it is, correct? Therefore, provide your Rhubarbs with the proper fertilizer and you will achieve the desired result.

And now, you may be asking what kind of fertilizer you should use for your Rhubarb. These Rhubarb fertilizer recommendations have become a hot topic in recent years. So, as a result of this post, you will learn how to select the best rhubarb fertilizers and how to utilize them. 

How Should You Fertilize Rhubarb?

How To Fertilize Rhubarb

Fertilize your rhubarb plants early in the spring the year after they are planted, before they begin to sprout noticeably. A decent all-purpose fertilizer to use is 10-10-10. As a fertilizer, compost or well-rotted manure can be used. Make sure to follow the manufacturer’s recommendations if you use granular fertilizer. 1 1/2 pounds per 100 square feet is the typical rate of application. 

Do not allow any of the granules to come into direct touch with the plant when scattering them in a circle around it. As a result, the plant can be damaged in some way. It is important to water thoroughly after applying the granular fertilizer. If you decide to use a water-soluble fertilizer, you can use a hose-end sprayer, a watering can, or a bucket. You can now begin harvesting your rhubarb plants now that they are flourishing.


Regardless of the fertilizer you use, avoid getting it in contact with the stems of this vegetable. Keep a few centimeters away; this will prevent the plant from being burned. Additionally, keep in mind that when it comes to fertilizing more in less time, it is preferable to fall short of the dose than to exceed it.

Finally, when using rhubarb fertilizers, carefully read the directions on the fertilizer package. Each quality fertilizer comes with easy-to-follow directions for use. If you’re combining it with organic fertilizer, you can use lesser quantities than those indicated in the guidelines.

When Should I Fertilize Rhubarb?

When To Fertilize Rhubarb

In the first year of planting, you should feed new rhubarb plants in March or April to jump-start their growth. This is the best time of year to add organic matter to the soil. Fertilizer will be absorbed into the soil as you water your rhubarb. The rhubarb roots and crowns will benefit from this, and the outcome will be a bumper crop of rhubarb stalks.

Your rhubarb will benefit from an extra dose of fertilizer in the fall, in addition to what you used in the spring. As soon as your rhubarb crowns have ceased generating new stalks, in September or October, you should cut them back. 4 weeks before the first normal autumn frost, apply fertilizer to your plants. This permits the plant to absorb the nutrients from the fertilizer and strengthen itself before the winter. The second year’s crop will be stronger as a result. These Rhubarb plants need to be fertilized three to four times per year.

3 of The Best Fertilizers For Rhubarb 

Rhubarb is a perennial vegetable, which means that once it is established, you can harvest the crimson stalks for up to 5 years after they are planted. And it is for this reason that a decent fertilizer is required to ensure that it continues to develop strongly. 

However, We recommend using a fertilizer with an NPK ratio of 12-12-12 for your rhubarb plants in garden centers or home gardens. Calcium and magnesium can also be good for your plant’s health in a fertilizer mix. Accordingly, below are some excellent fertilizers that will meet your expectations. 

Miracle-Gro Water Soluble All Purpose Plant Food Review for Rhubarb

[amazon box=”B000OWF7YI” template=”horizontal”]

Water Soluble Miracle-Gro All Purpose Plant Food, when compared to new plants that have not been fed, provides immediate nutrition to help them grow larger and more beautiful. It is manageable for use on a wide range of plants including flowers, vegetables, trees, shrubs and even indoor houseplants.


  • Reusable, waterproof, and with a measuring scoop included, it makes it easy to store and measure your plant food.
  • The NPK ratio is 24-8-16 in this product.
  • The Miracle-Gro Garden Feeder or any other watering device can be used while watering your plants to feed an area up to 2,000 square feet.

Iron and manganese are mixed with an organic compound called chelate in the fertilizer, which is interesting. Additionally, chelate maintains the availability of these minerals for absorption.

Directions: For potted Rhubarbs, mix half a teaspoon of fertilizer with 4 liters of water & soak the soil. It will last productive for 2 weeks. 

So don’t miss out on this amazing plant food!

JR Peters Jack’s Classic All Purpose Fertilizer Review for Rhubarb

[amazon box=”B00BIO560G” template=”horizontal”]

It’s a high-quality fertilizer that’s prepared using the best ingredients. It dissolves more quickly and forms fewer cakes than other leading brands. A blue tracer is included. To sum it up, the NPK ratio is 20-20-20. 

This all-purpose fertilizer aids in the maintenance of plants, as well as rapid greening and growth. Root and shoot growth are the primary objectives of this product. Your Rhubarb may be fed immediately, thanks to its water-soluble nature. Do you suppose a hungry Rhubarb would want anything else? I’m not convinced. 

Additionally, the fertilizer contains chelated copper, iron, manganese, and zinc to provide adequate availability and avoid adverse reactions. 

Directions: Spray or soak the soil with a solution made up of 1/4 teaspoon of this fertilizer per gallon of water. That is all. 

Hope you’ll take a look at this incredible product!

Dr Earth Organic Tomato, Vegetable & Herb Fertilizer Review for Rhubarb

[amazon box=”B000VZRV4C” template=”horizontal”]

The 4 pound DR Earth 704P Tomato Vegetable Garden Fertilizer provides more prolific harvests with more nutritious and tastier vegetables. It comprises eight different strains of Ecto- and Endo-mycorrhizae that help with drought tolerance, nutrient availability, and plant performance. 

The nutrients are released promptly and continue to feed for several months, ensuring that the quality of the food is maintained at a high level. Human and feed-grade components are used in the making of this product. An abundance of multi-minerals, proteins, carbs, and trace elements promotes healthy soils capable of producing the healthiest rhubarb for you and your loved ones. 

The product contains 4% nitrogen, 6% phosphorus, 3% potassium, and 7.5% calcium. This fertilizer slowly releases all of its nitrogen. Without a doubt, it is ideal for established Rhubarb but is also suitable for seedlings.

Directions: It’s a type of fertilizer that comes in granular form. Therefore, evenly sprinkle half a cup of fertilizer over the topsoil of a 12-inch diameter container. Before thorough watering, lightly rake the soil using a hand rake.

Ensure that you explore this fertilizer!

Does Rhubarb Need A Lot Of Fertilizer?

Does Rhubarb Need A Lot Of Fertilizer?

Yes! A perennial plant, Rhubarb can be counted on to live in your garden for many years to come when given its essential nutrients. In the spring and fall or early winter, rhubarb needs fertilizer with good drainage because it is long-lived.

Annual vegetables, on the other hand, often only require fertilization in the springtime. The amount of fertilizer needed for a rhubarb patch is, therefore, two times greater than that required for an annual vegetable patch. In the summer and late summer, you should not need to fertilize Rhubarb.

Additionally, the amount of fertilizer required by your plants will vary according to their size and variety. If you’re using a slow-release pellet, it’s recommended to use approximately two pounds per 100 square feet. We approve one gallon of liquid fertilizer per 200 square foot planting space in early spring when new shoots emerge from the earth.


After it has established itself, you can reap the reddish stalks of rhubarb for up to five years.  

To get the finest fertilizer for your Rhubarb, look for vegetable and herb fertilizers, all-purpose fertilizers, or balanced fertilizers. You can also add compost, manure, or green manure to the soil to increase its organic content.

So with this in mind, I’m crossing my fingers that you’ll find the best Rhubarb fertilizer and take good care of your plant. The best of luck to you, my friend!


Do Rhubarb leaves and plants require full sun?

For new plantings and new growth, Rhubarb will require full sun that covers the soil surface would be a good idea. Young plants and mature plants will also require mostly full sun and will tolerate light shade.

Is horse manure good for Rhubarb?

Absolutely! It can be utilized year-round and does not require additional treatment. Simply spread it across your garden space and incorporate it into the soil. That is all! Horse dung can be an excellent technique to enhance the growth of your plants.

Is Miracle Grow good for Rhubarb?

The fertilizer Miracle-Gro is not balanced. The nutrients nitrogen, phosphorus, and potassium are all in the same proportion in 10-10-10 fertilizer. In contrast, the nitrogen and potassium content in Miracle-Gro is higher, while the phosphorus content is lower. Miracle-Gro, on the other hand, is not a balanced fertilizer. Equal parts nitrogen, phosphorous, and potassium are contained in 10-10-10 fertilizer. On the other hand, Miracle-Gro is high in nitrogen and potassium but low in phosphorus. While this is ideal for some flowers, it is not appropriate for a perennial veggie like rhubarb. Therefore, apply a rhubarb-specific vegetable fertilizer.

How Long of a Harvest will Rhubarb Produce?

Typically you can harvest Rhubarb for up to 8 years if planted once the ground thaws and in a sunny area that isn’t disturbed.