The 13-13-13 fertilizer will help you maintain a beautiful lawn and garden, even though different causes, such as prolonged drought and unfavorable growing circumstances, can cause disaster.

feeding lawn with granular fertilizer for perfect green grassYou could be unsure of the fertilizer you’re using or if you really need to apply it. The various fertilizer types and which one is ideal for applying on lawns, shrubs, trees, flowers, and gardens, and the function of 13-13-13 fertilizer and when and how to apply it will be covered in this article.

What Is 13-13-13 Fertilizer?

Triple 13 fertilizer makes for fantastic plant food and lawn fertilizer since it is a balanced formula containing equal amounts of all three nutritional components. These values show the percentages of nitrogen, phosphorus, and potassium. The three main nutrients plants and lawns require to grow are macronutrients.

– Impacts of the Triple 13 Fertilizer

For instance, nitrogen encourages growth and is what gives your lawn and plant foliage their beautiful green color. But an excess of nitrogen can cause the grass to burn and even damage its roots. If you own a dog or have ever let nitrogen-rich fertilizer sit on your lawn during sweltering summer days, you may have seen this.

During the early spring, triple 13 fertilizer is typically used to jump-start the growth of grass, gardens, flowers, and shrubs. New lawns and other types of landscaping can be established more easily with a balanced formula.

You know that nitrogen encourages the visible grass blades’ growth and color. However, phosphorus is what aids in feeding and growing roots. Furthermore, as for potassium, it is in charge of ensuring that your landscaping receives the ideal ratio of nutrients and water.

Keep in mind that a balanced formula guarantees an equal distribution of the nutrients and compounds that plants and grass require to maintain growth. It encourages early growth in gardens and boosts plants in the middle of the growing season. 

Nonetheless, as previously mentioned, a stable fertilizer is optimal for freshly established plants, bushes, trees, and lawns. In particular, plants require assistance establishing their roots and visible portions in clay or rocky soils.


All fertilizer packages or bags contain a set of three numbers that, in that order, indicate the percentages of nitrogen, phosphorus, and potassium.

– Ratio N-P-K

Trees and grass require nutrients from the soil to continue growing. But soils may lose nutrients or lose their balance. You may determine your soil’s pH and the appropriate N-P-K ratio by performing a quick soil test.

The appropriate N-P-K ratio will also depend on the growing season, the surrounding environment, and the state of the plant itself.

– Nitrogen

Nitrogen is the perfect lawn food you could ask for. According to Rutgers University, if the fertilizer includes 20 percent nitrogen, a lawn needs one pound of nitrogen for every 1,000 square feet.

A 1,000 square foot of grass requires 7.7 pounds of fertilizer with a 13 percent nitrogen content. Fertilizers rich in nitrogen encourage observable growth and vibrant color.

However, the soil’s pH can become more acidic as a result of nitrogen. While nitrate-based fertilizers do not cause soil acidification, ammonium-based nitrogen has a higher risk of doing so.

You could require a fertilizer with a higher nitrogen and phosphorus concentration if the pH of your soil is too alkaline. In addition to nitrogen and phosphorus, soil that is already too acidic may require further amendments.

– Phosphorous

Some governments limit how much phosphorus fertilizer can contain because if it’s permitted to enter wastewater, it can have negative environmental effects. When you try to order products online, certain types of fertilizers will appear unavailable in your location.

Nitrogen has a greater influence on pH balance than phosphorus; however, phosphorus can still cause an increase in acidity. Typically, potassium has little effect on the pH of soil.

However, some soils may inherently lack phosphorus or may start to lose it over time. Nutrient depletion can also result from excessive irrigation or dry weather. For the development and maintenance of robust root systems, plants and grasses require phosphorus.

You generally don’t need so much phosphorus in your fertilizer if it is later in the growing season or if your sod and trees are already established. However, you need a healthy dosage of phosphorus if you’ve recently planted a new tree, expanded your garden, or installed new sod.

– Potassium

This nutrient promotes overall growth in your landscape and sustains growth throughout the growing season. However, potassium is also essential for the health of your grass and trees when they are dormant.

It is essential to have sufficient potassium reserves to build resistance to disease, cold, and drought.


Plants To Use 13-13-13 Fertilizer

The timing and frequency of nutrients are essential for success, whether using a 20-20-20 fertilizer or any other balanced multi-purpose fertilizer. The feeding schedule plays a significant role in the healthy growth of plants. Here is a more thorough explanation of how to apply balanced formulas to various kinds of plants.

– Shrubs And Trees

1. Shrubs And TreesApplying half a pound of stable fertilizer per half an inch of the perimeter of trees and bushes is advisable. Applying this at the start of the growing season is a smart idea. In the early or late fall, submit another application. Shrubs follow the same rules, in the spring, shrubs and hedges can utilize 13-13-13 fertilizer at the same rate as flowers.

In addition to shrubs and trees, you may also used this fertilizer on fruit trees. During the growing season, fruit trees can get the same dosage of stable fertilizer twice.

– Flowers

2. FlowersEvery 12 weeks, flowers should be fertilized with a balanced formula. Additionally, it can topdress a garden and give it a nutrient boost in the middle of the growing season. The suggested flower application rate is one pound per 100 square feet every 12 weeks. 

– Vegetable Gardens

3. Vegetable GardensBefore starting any seeds or seedlings, you should treat the soil with a balanced vegetable garden fertilizer. Early April should be the time for this.

Then, add more as a topping to boost your plants in the middle of the growing season.

Keep in mind that various vegetable kinds require various types and amounts of fertilizer depending on the growth stage. For instance, tomatoes require high nitrogen levels at first and then phosphorus once it is evident that blossoms and fruit might enhance productivity and growth.

– Houseplants

4. HouseplantsYour indoor plants will benefit from a balanced formula like triple 13 if you utilize nutrient-rich soil. Houseplants should only ever be fertilized sparingly, ideally using a liquid or diluted feed that may be let to run off. Feeding and watering should be spaced out so that any accumulation of fertilizer residue can be washed out. Results should be visible between two to five days of application.

– Lawns

LawnsFertilizer with the nutrient balance of 13-13-13 is beneficial for lawns since it promotes the growth of green, healthy grass and a strong root system. For established grass, nevertheless, it is not the ideal option because older growth requires high nitrogen and a low phosphate and potash mix.

When your lawn is first seeded, you should use 13-13-13 fertilizer since grass first needs all three nutrients (N, P, and K) to grow and flourish.

However, because older grass requires less phosphorus, it is not the ideal option every time you feed your lawn.

Type Of Fertilizer

Organic and synthetic fertilizers both exist in a variety of types. There are benefits and disadvantages to each of these forms. The primary forms are shown below.

– Drinkable Concentrate

Following the directions on the label, liquid concentrate fertilizer must be diluted with water.

It must be applied with a watering can, sprayer, or hose, and the quantity applied will vary based on the method.

– Water Soluble Powder

Soluble fertilizer choices can either be dusted directly into the ground near the roots of plants, trees, and shrubs or diluted with the right amount of water. Water-soluble fertilizers are an economical way to feed plants. Still, because they operate quickly, root burn and leaching are possible.

– Granules With A Slow Release

If you’ve fertilized your lawns in the past, you’re probably most familiar with this kind of fertilizer. According to the directions on the container, slow-release granules must be administered using a spreader.

Before watering the fertilizer, certain slow-release granule varieties must sit on the lawn for up to 48 hours. Other kinds, typically those without weed killer, require watering after application.

Nutrients are distributed to your grass and plants by slow-release granules over time rather than all at once. When the weather is warm throughout the growing season, if you want to prevent scorched grass, or if you want to maintain growth over a few months, this is advantageous.

Fertilizer Spikes Around the dripline of a tree, bush, or shrub, fertilizer spikes are driven into the soil. They can also be positioned on your lawn, inside a potted plant, or in a garden bed.

Over time, these spikes finally disintegrate and release nutrients into the soil. The nutrients are exposed to your plant’s roots, which then take them in.

If properly buried in the soil, spikes are a convenient, mess-free way to fertilize that is safe to use around both humans and pets.

The drawback is that you need to use more than one for taller, more established trees and shrubs, which are often more expensive than other fertilizer varieties.

Frequently Asked Questions

– How Much Is 13-13-13 Fertilizer Used On An Acre?

Use the fertilizer 13-13-13. This all-purpose, quick-release solution provides a balanced amount of potassium, phosphorus, and nitrogen. We advise 300 pounds per acre as a minimum.

Keep an eye on it. Don’t push the fertilizer too deeply into the soil if you spread it before planting.

– Is Triple 13 A Beneficial Fertilizer For Pastures?

No, for grass pastures, you wouldn’t want to use 13-13-13 or 10-10-10, but rather a mixture of 16-4-8 or 20-5-10. In general, grasses require 4-1-2 N-P-K fertilizer. The soil test-based fertilizer recommendations from the University of Florida offer three degrees of nitrogen fertilization.

– Do Tomatoes Respond Well To Triple 13?

No, even though fertilizers like 8-8-8, 12-12-12, 13-13-13, and similar numbers are far better than none, they may cause the first and/or second cluster of blooms to break off before bearing fruit. 

– What Other Components Makeup Triple 13 Fertilizer?

On fertilizer bags, these components are frequently coded in percentages and are always listed in the same order:

Nitrogen, phosphorus, potassium, and sulfur are the first four elements.

For illustration, a complete fertilizer like Rogue Triple 13 specifies the following as its ingredients: 12 percent sulfur, 13 percent nitrogen, 13 percent phosphorus, and 13 percent potassium make up the mixture.

fertilizing plant


As you leave this post, here are some key takeaways we’d like for you to always have in the back of your mind:

  • Most 13-13-13 fertilizer makers will promote it as appropriate for shrubbery, flower gardens, trees, lawns, hedges, and more.
  • However, depending on the application, different fertilizers will need to be used differently in terms of how much, when, and how.
  • This is why you must read the suggested applications and timings on the bag of fertilizer that you buy.
  • Most of the time, fertilizer requirements for gardening applications will be higher than those for established lawns.

That being said, when applied correctly and according to instructions, 13-13-13 fertilizer will be a terrific choice as it will provide an immediate Greenup. It will help your plants, lawns, and trees build healthy and strong roots for a garden that merely thrives for years to come.

5/5 - (18 votes)