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The 5 Best Fertilizers for Boxwood

Not all fertilizers are created equal. The difference between the best fertilizers out there and average fertilizers is drastic. With the right fertilizer, your boxwood will grow strong and healthy.

Our top recommendation is…

Greenpinky’s top pick:
  • Perfect nutrient balance
  • Quality ingredients
  • Great price
Check Amazon for Best Price

The best fertilizers for boxwood deliver just the right amount of nutrients with appropriate proportions of each nutrient and also use high quality ingredients. Unfortunately, nowadays, the market is flooded with different brands and types of fertilizers that it can be challenging to buy the best one. I’ve taken the time to review fertilizers and narrowed down the list to boxwood fertilizers. I’ve also included a secret weapon/product that you will see below to help ensure healthy growth and survival of your boxwood.

Here are the best boxwood fertilizers that we recommend.

Comparing Our Top 3 Recommendations for Boxwood Fertilizers

Scotts Continuous Release Evergreen Flowering Tree and Shrub Fertilizer, 3-Pound (Not Sold in Pinellas County, FL) (2 Pack)
GreenPinky's Top Pick
Miracle-Gro Shake 'N Feed Flowering Trees and Shrubs Plant Food, 8 lbs
Miracle-Gro Tree & Shrub Plant Food Spikes, 12 Spikes/Pack
Scotts Continuous Release Evergreen Flowering Tree and Shrub Fertilizer, 3-Pound (Not Sold in Pinellas County, FL) (2 Pack)
Miracle-Gro Shake 'N Feed Flowering Trees and Shrubs Plant Food, 8 lbs
Miracle-Gro Tree & Shrub Plant Food Spikes, 12 Spikes/Pack
N-P-K: 11-7-7
N-P-K: 18-6-12
N-P-K: 15-5-10
-
55 Reviews
11,064 Reviews
-
$19.99
$17.40
$17.34
Scotts Continuous Release Evergreen Flowering Tree and Shrub Fertilizer, 3-Pound (Not Sold in Pinellas County, FL) (2 Pack)
Scotts Continuous Release Evergreen Flowering Tree and Shrub Fertilizer, 3-Pound (Not Sold in Pinellas County, FL) (2 Pack)
N-P-K: 11-7-7
55 Reviews
$19.99
GreenPinky's Top Pick
Miracle-Gro Shake 'N Feed Flowering Trees and Shrubs Plant Food, 8 lbs
Miracle-Gro Shake 'N Feed Flowering Trees and Shrubs Plant Food, 8 lbs
N-P-K: 18-6-12
11,064 Reviews
$17.40
Miracle-Gro Tree & Shrub Plant Food Spikes, 12 Spikes/Pack
Miracle-Gro Tree & Shrub Plant Food Spikes, 12 Spikes/Pack
N-P-K: 15-5-10
-
-
$17.34
Boxwood
Healthy boxwood

The Best Boxwood Fertilizers

These are the best fertilizers for boxwood. They use quality ingredients and are much better than the other fertilizers on the market. Please keep reading below to learn more about each one. 

Fertilizers for Boxwood

Best Fertilizers for Boxwood

For healthy plants with deep, lush foliage, Miracle-Gro’s Shake ‘N Feed for Flowering Trees and Shrubs is an excellent option. This fertilizer is perfect for established plants but also gentle enough to help newly repotted or young plants develop new growth. The formula is crafted to not only deliver natural nutrients to the plant but also to encourage microbe growth within the soil. This helps plants develop resistance to diseases and drought and also creates stronger root systems for plants that are hardier overall.

Scotts Continuous Release Evergreen fertilizer is the perfect choice for shrubs such as boxwoods. The formula is crafted so as to deliver specific nutrients while raising the acid level in the soil, which is perfect for plants such as boxwoods that prefer a low soil pH. The formula is also designed to be gentle so that it won’t burn plants’ delicate leaves. Gardeners will find that, after using this fertilizer, their boxwoods have healthier root systems, are stronger overall, and produce richly colored, full foliage.

Jobe’s Evergreen Fertilizer Spikes are made with a pre-measured dose of nutrients specifically designed to help evergreens such as boxwoods grow stronger and healthier. These spikes are much less mess than other fertilizers. In addition, the nutrients won’t runoff and away from the plant during watering or rain. Jobe’s Evergreen Fertilizer Spikes feature a slow-release formula, so plants are fed for an entire season. The formula also contains a special microorganism that helps to break down organic material, ensuring that the fertilizer is released directly into the soil near the plant’s roots.

Made to ensure healthy growth in shrubs, Miracle-Gro Tree & Shrub Plant Food Spikescontain natural, essential ingredients plants need in order to thrive. The premeasured spikes are simple to insert, and gardeners won’t need to worry about feeding their plants the correct amount. In addition, the spikes help to deliver nutrients directly to plant roots. Gardeners who use these plant food spikes will find that their boxwoods are full, rich in color, and have strong root systems.

Note, this is NOT a fertilizer. Rather it is an anti-dessicant or anti-transpirant. Protecting plants during harsh weather is often just as crucial as fertilizing them during the growing season, and Bonide Wilt Stop Plant Protector is designed to do just that.

When it is sprayed on a boxwood, the anti-transpirant coats the leaves in a flexible film. This film helps to prevent the dehydration that many plants face due to fluctuating cold temperatures and winter winds. This particular anti-transpirant lasts all season and can protect plants not only from harsh winter weather but also salt burns, sun, and shock. Please read more about anti-transpirants in the short guide below. I highly recommend buying and applying it.

Nutrients for boxwood

Boxwood Growing Guide

Boxwoods are beautiful evergreens that help provide a color to an otherwise barren lawn or garden during the winter and provide structure in the spring and summer. They vary in size, shape, and growth rates, so it is important to raise a boxwood that will fit your ideas for your garden and also for the grow conditions in which you are raising it.

Best Fertilizer N-P-K Ratio

The best fertilizers for boxwood have an N-P-K ratio of roughly 10-6-4 and preferably have slow-release nitrogen to allow for continuous delivery of nutrients over time. The high nitrogen content help boxwoods maintain their green leaves. Magnesium supplementation or having magnesium in the fertilizer that you choose is also helpful as it is important to raising a healthy boxwood. If your fertilizer lacks magnesium, you can buy sitz bath salts (MgSO4) and mix with water as a simple and cheap way to deliver magnesium to your boxwood. Generally you’ll want to apply the fertilizer that you buy to the area around your boxwood a few feet out from the evergreen because the roots tend to reach out this far. Make sure you follow the product instructions in regards to when and how to apply the nutrients. Generally, you’ll want to fertilize your boxwood in late fall.

Do Not Over Fertilize

Make sure that you do not over fertilize your boxwood as this can lead to more damage than not giving your bush any fertilizer at all. If you see the edges of your boxwood’s foliage turning brown this likely means that the leaves are developing leaf burn, which is a symbol of over fertilization.

Best Fertilizers for Boxwood

Winter Care

Evergreens will usually survive winters without any major issues. However, in harsh winters, they may discolor, but its color should return in the spring. In very extreme temperature, you can consider throwing burlap over it; this will protect it from harsh wind, but will still allow some airflow. Make to water in late fall or early November, as the soil can get quite dry during this time. I also highly recommend getting an anti-transpirant such as Bonide Wilt Stop Plant Protector that is displayed above to help ensure that your boxwood survives the winter. An anti-transpirant prevents water loss from the leaves, which helps the plant survive in the winter when it cannot take up enough water to replace that lost in the leaves. Make sure to apply the anti-transpirant in late-Fall or early-Winter when temperatures begin to drop. If you apply it too early, higher level of water will be retained in the foliage, which can result in cellular damage. 

Prune Dead Branches

Dead leaves and stem often accumulate in the center of boxwood. Make sure to prune back any dead branches and also try to remove any dead branches from the center of the plant as leaving them there can lead to diseases. Thinning out not only the dead branches, but also some of the outside growth, also help more airflow and light to reach the center which will help your boxwood continue to growth healthily.  

Bottom Line

Again, I recommend buying the Miracle-Gro Shake N’ Feed Fertilizer. Don’t make the mistake of buy any average fertilizer at your local gardening store. Many of them will simply not produce the same results. You cannot go wrong with any of the fertilizers above. 

The Green Pinky

About the author: Carley Miller is a horticultural expert at TheGreenPinky. She previously owned a landscaping business for 25 years and worked at a local garden center for 10 years. Read More