Best Fertilizer for Asparagus

Best Fertilizer for Asparagus – 5 Amazing Products and Reviews

When you think about how great asparagus actually is it’s only natural to look for the best possible fertilizers for it. If that is the case you have come to the right place.

As you may already know asparagus is rich in vitamins A, C, and K and is also known for the ability to improve your digestion and weight loss. Not only that but it can also lower your blood pressure and help you to maintain a healthy pregnancy.

Let’s not stall any longer let’s jump straight to the point so you can nurture your asparagus in the best way possible.

Here on our list, we have selected 5 products that have proved through our testing to be the best when it comes to growing your asparagus plants. So that all of your asparagus growers and lovers can grow your plants knowing that you choose the best possible solution.

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Miracle-Gro Water Soluble
  • 4.5 x 9.5 x 12.5 inches
  • Item Weight: 10 pounds
Down to Earth Seabird Guano Mix
  • 3.5 x 8 x 10.8 inches
  • Item Weight 5 pounds
Southern Ag Granular Fertilizer
  • 10.51 x 8.39 x 2.36 inches
  • Item Weight: 5.06 pounds

1. Miracle-Gro Water Soluble Plant Food

For the first product on our list, we have a well-known gardening company Miracle-Gro. This company is if I can say the leading supplier with gardening materials and substances. Therefore, I suppose there is no need to say anything more than this.


  • Product Dimensions: 4.5 x 9.5 x 12.5 inches
  • Item Weight: 10 pounds

Key Features

The good thing about Miracle-gro is that it’s probably the cheapest fertilizer out there, you can get it locally, and of course at Amazon where you can buy bigger boxes that are more affordable than the smaller ones when you do the math.

The next cool thing about this product is that if either you choose to grow asparagus plants indoors or outdoor there is a guide on the box on how much fertilizer you should use for your soil.

For the best outcome, the suggested time for fertilizing asparagus is every few weeks, or in other words somewhere between every 7-14 days.

My personal suggestion is to use this product with the Miracle-Gro garden feeder. With this, if I can call it device you can apply fertilizer to your asparagus like never before.

You can also use other varieties like the spoon they give you with the product itself.

As you can already assume this product is rich in essential nutrients so that your growing asparagus can grow even bigger and more beautiful. So, when the time for harvest comes in early spring you can enjoy all the health benefits asparagus brings.

Also one more important thing is that the company guarantees that if you use this product the way as directed your plants won’t burn.

One more tip, a lot of people ask me are slow-release granules better than Water soluble. My personal opinion is that Water-soluble are better for giving your asparagus a fast boost.

But when you don’t have time you can use the release slow granules so that your asparagus can be fed continuously over a period of time and produce new spears.

To avoid root rot pay attention to the soil quality every time before applying the fertilizer. And also choose the amount you fertilize wisely sometimes less is better than the suggested amount.

  • Budget-friendly
  • Rich with essential nutrients
  • Easy to use
  • May attract flyes
  • Too much usage can lead to root rot

2. Down to Earth Seabird Guano Mix

This product right here is one of the best fertilizers that I personally came across. As the name says Down to Earth all Natural, thus, I’m going to recommend this product to all of your that like to go all-natural.

If you want to achieve massive growth in your plants and doing it the natural way this is the thing for you.


  • Product Dimensions: 3.5 x 8 x 10.8 inches
  • Item Weight 5 pounds

Key Features

The first thing you need to look after when you want to enrich your soil with a good fertilizer is water. As I said, good water is essential for your asparagus growth (so avoid unboiled tap water, depending on where you live).

Asparagus growing time before the first harvest is ruffly 4 years, therefore, in the following years you need to supply it with good nutrients. So, when the fourth year comes you can enjoy your already established asparagus.

This particular product is one of my favorites, one of the reasons is the all-natural components. This all-natural fertilizer with the 0-11-0 formula is listed by the OMRI (the Organic Materials Review Institute) for use in organic production.

A thing that you don’t necessarily need to do, but I must suggest, that is with this fertilizer you can also add to the mix Fish Bone Meal (product from the same company). With these two in the mix, your asparagus plant is destined to succeed.

Rich with phosphorous this product will enhance root development as well as flower development with female asparagus plants.

The usage guide says 2.5 – 5 lbs per 100 sq feet and that is the thing to look after. When you run your soil test if it says it’s low in phosphorus add more than 2.5 lbs to 100 sq feet. If that isn’t the case follow the given amount of 2.5 lbs.

Also, when you put the fertilizer in the water you need to wait for 48 hrs for it to resolve, it won’t resolve immediately, so don’t panic if this happens.

Phosphorous is well known in terms of helping plants to accept new soil by boosting their root development. And what comes with strong roots? A good and healthy plant that can absorb more water and proper nutrition through its root system.

Then, when early spring comes and the time to harvest asparagus comes, a healthy crop was all that mattered. Now you can enjoy early summer by eating healthy organic food that you grew in your garden.

  • All natural fertilizer
  • Rich with phosphorus
  • Thin package bags, easy to rupture (careful when you carried them it might spill)
  • Prone to fungus gnats
  • Can cause root rot

3. Southern Ag Granular Fertilizer

Here on our list, we have a couple of veteran compies and this is one of them. Southern Agricultural Insecticides was formed around 1930 by Hans Diem and later incorporated in 1947. For someone to be in the business for such a long time, I must presume that their products have a certain (good) level of quality.


  • Product Dimension: 10.51 x 8.39 x 2.36 inches
  • Item Weight: 5.06 pounds

Key Features

This formula contains 10% nitrogen, 10% phosphorous (p205), 10% potassium levels plus minor elements for preventing asparagus rust and make asparagus plantings easier.

If you are wondering how you can start your own asparagus patch I will give you some guidelines.

My personal suggestion is to plant asparagus seed indoors about 8 weeks before the last frost date in your country. If you want or need to plant it outdoors in the asparagus bed you should do so at least 3 weeks before the last frost date.

If you want to plant seeds directly into the asparagus bed be sure that the ground temperature is 77 degrees or higher or your asparagus patch won’t succeed. The best way to start a patch is to plant crowns or roots.

Asparagus is a heavy feeder, so you will need to maintain a good flow of proper nutrients. Therefore, when harvested you will have healthy and good quality food on your table.

Harvest or planting isn’t the difficult part, for me, the difficult part is waiting 4 years for the first samples. But if you don’t want to waste time, follow the guidelines that we gave you and you will be fine.

In early growth, if you want to avoid any confrontation with the asparagus beetle you can get good organic control of asparagus beetles by spraying plants with NEEM early in the season.

The application of this product is simple, all you need to do is spread evenly over the desired arena.

  • Easy to use
  • Good formula
  • Overpriced

4. Dr. Earth Exotic Blend Palm

For the fourth product on our list, we have a well-established veteran if I may say. Dr.Earth serves the organic community for more than 29 years, they are known for introducing the first probiotic soil way back in 1991.

Their motto is to make the best possible products from the best organic ingredients on earth.


  • Product Dimensions: 14.5 x 13.5 x 11 inches
  • Item Weight: 3.75 pounds

Key Features

Everything that is organic is my thing and with this fertilizer being the only non-GMO project that is approved in the USA this should be your thing also.

When you think about, in this case, asparagus plant or any other plant, you would want your plants’ growth to be stimulated by an organic fertilizer for the best results.

Watching your plants grow should be a good feeling if you are a gardener or even an amateur at least. Now with this awesome fertilizer that is handcrafted from multiple organic ingredients, your thrill should be even bigger (like your asparagus will be).

For better asparagus growth you should take this fertilizer into consideration because this product is enriched with multi-minerals, proteins, carbohydrates, humic acids, and trace elements that will promote healthy soil nutrients in your home garden even without full sun.

The organic part is far real, this product is certified from the OMRI, OIM (organic input materials), CCOF (California certified organic farmers), and as I said a non-GMO project verified the highest level of purity.

It’s very simple to use, before planting your asparagus seed add half the cup to the soil that will be used to fill the planting hole that you dig. When you finish planting add one more half-cup around the plant and work it gently into the soil.

For established asparagus use one cup for every inch of trunk diameter, apply every two months throughout the growing season.

This fertilizer is derived from feather meal, fishbone meal, bone meal, magnesium sulfate, alfalfa meal, potassium sulfate, and kelp flour.

The thing they guarantee is the analysis that says 5% total nitrogen, 5% water-insoluble nitrogen, available phosphate 4 %, magnesium, and sulfur 2 and 4.75 % a well-balanced fertilizer for the best ground nourishment.

With this product, your asparagus spears will surely grow big and when spring comes you will produce good quality asparagus that can be harvested later.

If your question is what does asparagus bed need except this fertilizer. Some suggestions are that a trench should be 6 or 8 inches deep one inch of fertilizer and then soil one inch also. Then you should lay the roots flat and add 2 more inches of soil.

Always remember to use the right amount of fertilizers to provide the right nutrient amount for your growing asparagus plant. So that your asparagus plants can strive with the right organic matter provided.

  • Organic material (certified by multiple organizations)
  • Good analysis
  • Overall good quality
  • Bad small may occur
  • Soil surface may catch mold

5. Osmocote Smart-Release

For the fifth and final product on our list, we have the Osmocote plant food. This product is marketed and distributed by the well-known Miracle-Gro company. Made for indoor and outdoor usage gives you plenty of opportunities to explore the world of gardening.


  • Product Dimensions: 4.2 x 7 x 13.5 inches
  • Item Weight: 8.1 pounds

Key Features

This particular product is rich in 11 essential nutrients providing plants with all of the good stuff.

Planting was never easier, before the spears emerge you need to follow few basic steps for fertilizing asparagus the right way.

First, sprinkle 1 scoopful of plant food per 4 square feet (4 square feet or per 2 gallons). Mix the ingredients into the top 1-3 inches apart of soil and water plants regularly. The cool thing about this asparagus fertilizer is that you need to apply it only once every six months.

Osmocote Plant Food consists of a nutrient granule coated with semi-permeable resin. The nutrients are water dissolving, the coating permits water to penetrate the granule and dissolve all the essential nutrients.

One thing to know about this fertilizer is that the bigger the soil temperature is more nutrients will be released. Therefore, better results can be expected during late spring or even spring than during late fall or late winter.

This product showed good results overall, my garden was blooming, my asparagus spears grew big and I can’t complain. Although I’m always good for the organic solution, this product can also do you good.

One heads-up, if you want your garden to flourish control weeds properly by cutting them and preventing the seed to spread. Sometimes fertilizing asparagus won’t be enough, you must maintain your garden at all times.

  • Feeds up to 6 months
  • Easy to use
  • The bigger the temperature better the results
  • 11 essential nutrients
  • It may be less effective during the colder period of time

What to Look for in a Good Fertilizer for Asparagus

1. Formula

An all-purpose fertilizer for asparagus planting should contain a 10-10-10 formula. Application of 1 to 1.5 pounds per 100 square feet. This may not always be the case, other formulas can also have a success rate.

2. Organic substances

My suggestion is to always go with the organic solution. Don’t get me wrong there are a lot of non-organic fertilizers that will do a great job. But if you want your food to grow in the healthiest possible environment, as I said my suggestion is to go with organic products.

3. Spray control or capsules

This choice differs on the time you have to spend gardening and the stage of your asparagus seeds or plant. Spray fertilizer that mixes with water and applies instantly is better for the fast growth (growth boost) of the plant in the early stages. The capsules are better for the late stage as they dissolve slowly and feed the plant continuously without your interference.


What is the best organic fertilizer for asparagus?

Well, the answer to this question isn’t easy. Why? Simply because there are lots of good organic fertilizers out there. Here on our list, you can find a couple of them that we think to have the best ingredients and that is overall really good.

How big should an asparagus bed be?

For the best outcome, your rows need to be at least 24 inches apart. This formation will allow 2 rows to fit in a 4-foot wide bed.

Fill a wheelbarrow up to two-thirds with the excavated soil and fertilizer (that you will later use to plant your asparagus). Do that for every 8 feet of row space.

Do asparagus plants spread?

At the beginning (small asparagus crowns) they will spread and tend to overcrowd your garden. But if you manage them properly as they grow the possibility of spread minors.


Here we have reached the end of our journey, I honestly hope that we were of help in any way. Growing asparagus plants take time and patients, but here with some of our useful tips, we hope to fasten the process so you can enjoy your healthy garden food and be satisfied. Good luck gardeners and goodbye.

Related: How to Propagate Asparagus Fern – An Easy Guide