7 Best Fertilizer for Lilacs

If you are shopping for the best fertilizers for lilac flowers, it is best to consider their dimensions, lifespan, and application, among other factors. Below, I have handpicked my favorite products based on these features. Continue reading on to learn more about why they matter to you.

When I think about summer plants, one of the first flowers on my mind is the lilac. This aromatic and vivid shrub does not require constant maintenance. It is easily cultivated, making it popular among gardeners during the season of sunshine. 

With that said, most plants still need fertilizer to ensure faster growth and produce more flowering trees. This article lists down the best fertilizer for lilacs. Each product includes a detailed review and a list of pros and cons, so you can easily compare them with one another.

I will also walk you through the factors to consider before finalizing your purchasing decision.

And to sum things up, I will answer several frequently asked questions about fertilizers in general.

Let us get on with the article!

A Quick Comparison of Our Favorites in 2022

IMAGEPRODUCT
  • Dimensions: 4.3 x 4.3 x 7.5 inches
  • Weight: 3 lb
  • Fertilizer Analysis: 24-8-16
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  • Dimensions: 4.2 x 7 x 13.5 inches
  • Weight: 8 lb
  • Fertilizer Analysis: 15-9-12
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  • Dimensions: 1 x 1 x 1 inches
  • Weight: 1.5 lb
  • Fertilizer Analysis: 20-20-20
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  • Dimensions: 13 x 8 x 6 inches
  • Weight: 0.5 lb
  • Fertilizer Analysis: 10-15-10
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  • Dimensions: 4 x 10.25 x 12.5 inches
  • Weight: 3 lb
  • Fertilizer Analysis: 6-8-20
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  • Dimensions: 6.5 x 9.5 x 2.5 inches
  • Weight: 0.87 lb
  • Fertilizer Analysis: 15-3-3
View On Amazon →Read Our Review
  • Dimensions: 3.5 x 8 x 10.8 inches
  • Weight: 5 lb
  • Fertilizer Analysis: 4-12-20
View On Amazon →Read Our Review

7 Best Fertilizer for Lilacs

Here are my top picks for the best fertilizer for lilacs. Each one can promote the flowers to grow bigger and faster.

1. Miracle-Gro Water Soluble All Purpose Plant Food – Editor’s Pick

Miracle-Gro Water Soluble All Purpose Plant Food

The first product on this list of the best fertilizer for lilacs is the Miracle-Gro Water Soluble All Purpose Plant Food.

It features all the essential nutrients, namely potassium, phosphorus, and nitrogen, to feed your flowering trees. This fertilizer can promote the growth of bigger and more beautiful shrubs.

To achieve the best results, feed your lilac bushes every one or two weeks when it is still actively growing. You can expect improvement overnight, but you need to apply the fertilizer regularly. 

Furthermore, this all-purpose plant food is safe to use and fertilize lilac bushes all plants. Miracle-Gro ensures that it will not burn your greenery as long as you use the product as directed.

Plus, it is available in different sizes. Feel free to choose from 8 oz, 1.5 lb, 3 lb, 5 lb, or 10 lb packages. The 1.5 lb can feed around 600 square feet of space. 

Despite these benefits, there are still a few downsides to consider before buying this best fertilizer for the lilac bush. First, some users were expecting a larger packaging due to the advertised pictures. Second, a few customers were disappointed about the leakage of the fertilizer when it arrived at their doorstep.

With that said, Miracle-Gro offers reliable customer service. So if you ever encountered any issue in the delivery, the company might be able to cover it.

Overall, the Miracle-Gro Water Soluble All Purpose Plant Food is my top choice for the best fertilizer for lilacs.

Pros:

  • This fertilizer offers essential nutrients, like potassium, phosphorus, and nitrogen, to promote blooming
  • It is safe to use for all plants, including deadhead lilacs and prune lilacs
  • Feed every one or two weeks for optimal results
  • The 1.5 lb feed can cover approximately 600 square feet of space

Cons:

  • Several users expected that the packaging was larger in person
  • A few customers complained about product leakage when it arrived

2. Osmocote Smart-Release Plant Food Plus Outdoor & Indoor – Runner-Up

Osmocote Smart-Release Plant Food Plus

If you are looking for a long-lasting fertilizer for your plant, consider getting the Osmocote Smart-Release Plant Food Plus Outdoor & Indoor.

Oscomote claims that this fertilizer boasts their best formula yet. It contains 11 essential nutrients that can feed all plant varieties, regardless of their current growing conditions. So whether you are taking care of outdoor shrubs or indoor plants, this product promotes their fast growth.

Additionally, this best fertilizer for lilac flowers can last up to six full months. Hence, you can apply this product with confidence to potted plants, shrubs, and even trees.

Moreover, Oscomote can guarantee that their fertilizer will not burn your greenery when you use it as directed.

However, before buying this fertilizer for lilacs, it is best to consider its downsides. First, this product leaves an empty plastic shell that remains after releasing the nutrients. Hence, it is not environmental-friendly. Second, some users noticed an overpowering smell when applying the fertilizer. You might want to wear gloves and a mask to protect yourself.

Nevertheless, the Osmocote Smart-Release Plant Food Plus is still among the best fertilizers on the market today.

Pros:

  • This plant food is fortified with 11 essential nutrients to promote blooming
  • It can feed lilac plants up to six full months
  • It works with almost all lilac bush plant varieties in various growing conditions
  • Oscomote pledges no burn to plants when used as directed

Cons:

  • The beads are plastic, which does not make the fertilizer environmental-friendly
  • Some users noticed an overpowering smell, so you might want to wear gloves and a mask when applying this fertilizer

3. J R Peters 52024 Jacks Classic No.1.5 20-20-20 All Purpose Fertilizer

J R Peters 52024 Jacks Classic No.1.5 20-20-20 All Purpose Fertilizer

Those looking for a raw fertilizer might like the J R Peters 52024 Jacks Classic No.1.5 20-20-20 All Purpose Fertilizer

It has a 20-20-20 fertilizer analysis. That simply means this product contains equal amounts of nitrogen, phosphorus, and potassium. Hence, it can promote the fast growth of lilac bushes and other plants.

Additionally, this fertilizer for lilac blooms uses the finest raw materials. They can quickly dissolve and cake less than other top brands. They do not leave any residue, making the product environmental-friendly.

Furthermore, it feeds flowering plants both through the roots and leaves. It is especially effective on indoor plants like foliage because it can keep their leaves green.

Finally, this professional fertilizer for lilac blooms is easy to use. Simply mix a specific amount of dry fertilizer with each gallon of water to produce a concentrated solution.

However, there are still a few cons to think about before buying this fertilizer. First, some users noted that the smell of the product was overwhelming. Second, a few customers received the product in a plastic bag instead of the advertised tub.

Despite these downsides, I still think the J R Peters 52024 Jacks Classic No.1.5 20-20-20 All Purpose Fertilizer is worth considering. It is one of the best plant food for gardeners. 

Pros:

  • A balanced formula can ensure the fast growth of plants
  • The raw material composition can quickly dissolve to ensure it is safe for the environment
  • It is formulated for root and shoot growth
  • Easy to mix and apply

Cons:

  • The smell of the fertilizer for lilacs is overwhelming when applying it
  • Some users received the product in a plastic bag instead of a tub

4. Schultz All Purpose 10-15-10 Plant Food Plus

Schultz All Purpose 10-15-10 Plant Food Plus

The Schultz All Purpose 10-15-10 Plant Food Plus is another effective fertilizer to consider for your lilac plants.

It offers the famous seven drops formula. This substance simply requires you to drop seven drops of fertilizer per quart of water to feed your plants.

Additionally, this plant food can work on both indoor and outdoor plants. It brings food to the shrubs the way nature does by delivering nutrients straight to the roots. It ultimately encourages new growth.

Moreover, this product has a 10-15-10 fertilizer analysis. It is ideal for transplanting, repotting, and rooting different types of plants.

Finally, the Schultz All-Purpose Fertilizer includes a dropper in the package. This item makes it easier to measure the product for creating a concentrated solution.

However, it is best to check the downsides of this fertilizer for lilac plants before buying it. First, some customers saw mold in their plants after using this plant food. Second, a few users also received damaged packaging, which led to leakage.

The pros outweigh the cons, though.

For this reason, I still included the Schultz All Purpose 10-15-10 Plant Food Plus in this list of the best fertilizer for lilacs. 

Pros:

  • It boasts of the famous seven drops formula
  • This fertilizer encourages new growth of plants
  • It is ideal for transplanting, repotting, and rooting both indoor and outdoor plants
  • The package includes an easy to measure dropper

Cons:

  • Some customers noticed mold in their plants after using this fertilizer
  • A few users were disappointed with the damaged packaging, which led to leakage

5. Burpee Bone Meal Fertilizer

Burpee Bone Meal Fertilizer

Are you looking for an organic fertilizer? Then, the Burpee Bone Meal Fertilizer might be the right product for your needs.

It uses readily available organic nitrogen, phosphorus, and calcium. These ingredients promote strong plant roots, more vibrant flowers, and more delicious food.

This fertilizer is also organic-certified. It ensures the healthy growth of root and bulb crops as well as other indoor plants.

Furthermore, this plant food is easy to use. Simply add to the soil or potting mix during seed starting or at any time prior to harvest. Once you apply it, you can expect the bone meal fertilizer to break down slowly, which releases nitrogen for successful plant growth. 

Finally, Burpee guarantees that their product contributes to the success of gardeners.

However, there are a few downsides to consider. First, some customers noticed crawling insects near the plant after applying this fertilizer. Second, a few users also saw mold in the soil. 

But considering its quality at a lower price, the Burpee Bone Meal Fertilizer is still worth considering. 

Pros:

  • An organic-certified fertilizer is ideal for new bedding plants and fall bulb plants
  • It promotes strong plant roots and more vibrant blooms
  • The bone meal fertilizer breaks down slowly for robust plant growth
  • The fine granular consistency ensures easy spreading

Cons:

  • Some users said the fertilizer attracted crawling insects such as cockroaches and gnats
  • A few users noticed mold in the soil after applying this fertilizer

6. Jobe’s 01660 Fertilizer Tree & Shrubs

Jobe's 01660 Fertilizer Tree & Shrubs

The Jobe’s 01660 Fertilizer Tree & Shrubs is another effective fertilizer worth considering. 

It offers pre-measured spikes that nourish plants at the roots. They can result in beautiful and healthy shrubs that can enhance the appearance of your yard.

Additionally, these fertilizer spikes are easy to use. Simply apply them during the early spring and late fall when the roots are still actively growing. You can also insert each tree spike around the drip line of the tree. Make sure to water well before the application. Then, you can expect the slow-release formula to feed the lilacs.

Moreover, the package includes a driving cap. This item makes it easy to insert the spike into the ground or around the drip line of the tree.

Finally, this best fertilizer does not have any wasteful runoff, mess, hazards, or even foul odors. Hence, they are safe to use inside your home when tending to indoor plants.

Despite these benefits, there are still a few downsides to consider. First, some users wished that the product instructions were clearer. Second, a few customers said that their package was missing the driving cap. Hence, they faced some difficulty trying to hammer the tree spike into the ground.

Overall, though, the Jobe’s 01660 Fertilizer Tree & Shrubs is still among the best fertilizer for lilacs on the market today.

Pros:

  • Pre-measured fertilizer spikes can nourish plants at the roots
  • The tree spikes are easy to insert around the drip line of each tree
  • It does not have any wasteful runoff, hazards, or bad smells
  • A driving cap can help you insert the spike into the ground

Cons:

  • Some users wished that the product instructions were clearer
  • The driving cap was not included in the package, which makes it difficult to hammer the spike into the ground

7. Down to Earth Organic Fish Bone Meal Fertilizer Mix 4-12-0

Down to Earth Organic Fish Bone Meal Fertilizer Mix

The last product on this list of the best fertilizers for lilacs is the Down to Earth Organic Fish Bone Meal Fertilizer Mix.

It contains five pounds of all-natural fertilizer. It is a great marine-based alternative to traditional steamed bone meals.

Additionally, it offers a 4-12-0 formula, making it a great source of organic phosphorus and calcium. Phosphorous can play a big role in both root and bloom development. It can help the plant absorb more water and nutrients from the soil. Hence, this ingredient can help produce high-quality fruit and flowers. 

Furthermore, this best fertilizer for lilacs contains a small amount of nitrogen. Hence, it can also promote the growth of new garden beds, perennials, and bulbs.

Lastly, Down to Earth includes fish bone meal application instructions. These can help you know the proper mixture of soil, water, and fertilizer required for a specific plant.

But before buying this fertilizer, it is essential to consider its cons. First, some users noticed ants all over the product, despite it being sealed. Second, a few customers were disappointed with the packaging because they were smaller than expected. 

Nevertheless, the Down to Earth Organic Fish Bone Meal is one of the best fertilizer mixes for lilac flowers.

Pros:

  • This all-natural fertilizer is a great alternative to traditional steamed bone meals
  • A 4-12-0 formula offers organic phosphorus and calcium for fast root and bloom development
  • It contains organic nitrogen to promote the growth of new garden beds
  • Easy to follow instructions

Cons:

  • Some users noticed ants all over the product
  • A few customers said that the packaging was smaller than they expected

How to Choose the Best Fertilizer for Lilacs

Now that you have gone through the best fertilizers for lilacs, you might have an idea which one to buy. But if you still have not decided, do not worry.

Below, I will discuss the factors you need to consider before choosing the best fertilizer for lilacs. 

Dimensions

First, consider the dimensions or how large your lilac plant is. Most lilac shrubs can grow between 8 feet and 20 feet. There is also dwarf lilac that can only stand up to 4 feet. Finally, lilac trees tower other lilac shrubs at 30 feet tall.

The kind of fertilizer you will buy will depend on the size of your plant. If you are taking care of common lilac shrubs, you can go with powder-based formula. Those who have large trees might want to go with tree spikes. 

Lifespan

Lilacs can take three years to bloom completely. If you want to ensure the health of flowers for a long time, it is best to apply fertilizer regularly.

As such, it is essential to consider the lifespan of the plant food before buying one. Check the expiry date. Or even better, ask the manufacturer about how long their product works before you have to apply the second dose. You might want to get fertilizer that can be reapplied after six months, especially if you have a busy schedule.

Application

You also have to think about the application type of fertilizer before buying this product.

When shopping for plant food, you will encounter some products in ready-to-use packs. You can simply measure and pour the solution into the plant. You will find them the easiest to handle.

You can also come across formulas in a very concentrated form. You will need to mix them with water before the application. If you skip this essential step, you increase the risk of killing the roots.

Finally, you can also go with fertilizer that mixes well with the soil and leave no residue. You do not have to clean any tiny shell that may be left behind from other types of fertilizers. You can also ensure that the product is safe for the environment.

Choosing between different application methods will depend on your personal preference and needs.

Fertilizer Background

It is also best to consider the background of fertilizer before finalizing your purchasing decision. The background can be broken into two types—organic and inorganic.

Organic fertilizers come from plant or animal sources, such as bone meal, fishbone, and seaweed. They are safe for the environment. However, they tend to work slower. You will have to be patient before seeing substantial results.

On the other hand, inorganic fertilizers contain minerals or synthetic chemicals. They work instantly to help grow your plants. However, they are subject to leaching, a process that occurs when the rain or irrigation water washes away the fertilizers. Some synthetic fertilizers also leave a residue that might harm the environment.

Composition

The composition of fertilizer is another important factor to consider before finalizing your purchasing decision.

It usually comprises three letters contained in NPK. This abbreviation refers to the ratio of the percentage of three macronutrients—nitrogen (N), phosphorus (P), and potassium (K)—in the mix. So, if a plant food has a 20-20-20 NPK ratio, it has a composition of 20% each of nitrogen, phosphorus, and potassium.

Out of all these three nutrients, nitrogen is perhaps the most important because it provides much-needed protein to the plant for its growth. Meanwhile, phosphorus promotes root development and plays a big role during the formative stage of a plant. Finally, potassium can help shrubs withstand adverse weather and diseases.

The 5-10-10 is the ideal NPK ratio when taking care of most lilacs. However, that does not mean it works on all plants. It is still up to the gardener with enough localized soil knowledge to determine the proper ratio.

Disease

If you are not still aware, lilacs are susceptible to insects, pests, and even blights. These can make holes in the trunk, which ultimately destroys the plant. Some pests, like mice and voles, can also gnaw and damage the shrubs. Powdery mildew can even appear on the surface, especially if you live in a place with humid weather. 

Fortunately, most fertilizers can easily eliminate these problems. But if you want to ensure the healthy growth of your plant, you can choose plant food that removes a specific pest.

Frequently Asked Questions

How to fertilize lilacs?

During the first year of planting, lilacs usually do not need fertilizer to grow. You might want to use plant food when you are in the second year period.

It is best to follow the instructions of the manufacturer to avoid damaging the plant accidentally. Some fertilizers will require you to mix the solution with water, while others allow you to apply them to the plant directly.

How often should I fertilize my lilacs?

Do not fertilize your plant more than once a year. This is especially true if your soil is already rich in nutrients. If you overfertilize your lilac shrubs, you cannot expect them to bloom fully and in time.

It is best to apply fertilizer during early spring when the shrubs begin to grow actively. Doing so can help promote the flowers to bloom more.

What kind of fertilizer should I use?

You can use both organic and inorganic fertilizers for lilac shrubs. However, you must choose a product with a balanced NPK ratio. If not, you can expect the plant to result in heavy blooms and excessive foliage.

You might also want to test your soil type before purchasing fertilizer. Make sure your lilac plant receives the best formulation of nutrients.

Conclusion

There you have it—my top picks for the best fertilizer for lilacs. I highly recommend each one as it can promote the growth of your lilac shrubs.

But if I can only suggest one product, it would be the Miracle-Gro Water Soluble All Purpose Plant Food. It has an NPK ratio of 24-8-16 to ensure that it contains the necessary nutrients to feed your lilac shrub. Additionally, this plant food is easy and safe to use for almost all plants. Furthermore, the manufacturer ensures that it will not burn your greenery. Finally, it is available in different packaging sizes to suit your various needs.

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