Fertilizer is added to the land or soil because it helps increase the soil’s fertility. It provides more necessary ingredients for the development of strong and resilient plants. The goal is to increase yields and promote increased product growth. It acts as a superfood for plants so that they grow larger, stronger, and experience increased flowering. Nitrogen, phosphorus, and potassium help the plants grow normally and develop normally.

What Does 15-15-15 Fertilizer Mean?

Fertilizers are defined according to the ratio of phosphorus, nitrogen, and potassium. This is called their NPK ratio. The 15-15-15 fertilizer denotes a fertilizer that contains equal parts of these elements. These numbers help to describe what the fertilizers will do. For example, it is mixed in with the soil during the early growth of crops that will be cultivated, because it is designed for strong plant growth.

It is considered a complete fertilizer because it contains all three of these key nutrients. These types of fertilizers are used for general purposes because they promote three key factors when it comes to healthy growth. However, there are some times, when you would want to choose a mixture that has a higher concentration of any one nutrient, because of its ability to promote healthier growth. For example, a new lawn would want a fertilizer that contained more phosphorus, because the roots are cut off and phosphorus helps to build strong roots.

What is 15-15-15 Fertilizer Good for?

15-15-15 fertilizer is precisely balanced with the right amounts of nitrogen, potassium, and phosphorus to help in providing an even distribution of these nutrients in growing plants. It is used predominantly for vegetables, turf, ornamentals, trees, and citrus. Additionally, it provides a cure for winterizing lawns and turf, because it works to strengthen and thicken them.

New lawns would need a small amount of nitrogen and large amounts of potassium and phosphorus. Established lawns would want large amounts of nitrogen and small amounts of potassium and phosphorus. A stressed lawn would need more potassium. Therefore, when preparing your lawn for extreme heat or extreme cold weather, you would want to make sure that the fertilizer has a large amount of nitrogen and potassium. Many people choose a triple 15 fertilizer for winterization or drastic weather changes because it contains adequate amounts of these key ingredients. However, a big-small-big orientation is also effective.

Nitrogen (N)

The nitrogen in the fertilizer is good for producing tender and lush green leaves and is essential for foliage and growth. Foliage that is yellow-green in color is usually lacking nitrogen. Additionally, if there is little to no growth, there could be a nitrogen deficiency.

The nitrogen in the fertilizer can help in the plant’s development because it helps to increase the seed’s production capacity while making stronger stems and leaves. It helps to prepare the leaves for the photosynthesis process, which is why it plays such an important role in the development of the plant.

Phosphorus (P)

The phosphorous helps to stimulate growth in the roots and promotes the development of seeds, flowers, and fruits. A phosphorous deficiency can create a purplish discoloration of the leaves and may result in stunted or slow growth. It is known as the energizer because it works to transfer the energy from the sun into a source of energy for growth and other functions.

Potassium (K)

The Potassium in the fertilizer help provides protective features that allow the plants to tolerate changes in the weather. Potassium is also important in resisting disease and strengthens the cell walls in the stem. A lack of potassium in the soil can lead to stems being weak and stunts growth. It is what provides protein to vegetables and fruits.

Best 15-15-15 Fertilizer

That is why triple 15 fertilizer is considered for general purposes and used to winterize lawns. It helps to promote the growth of the foliage, the roots, and helps to protect them against changes in the weather. Therefore, when choosing a fertilizer, it is important to consider what you want the fertilizer to do. Most lawn fertilizers have a high first number because the nitrogen helps grow above the ground.

  1. Triple Pro 15-15-15 Fertilizer

This fertilizer is professionally homogeneous with a uniform amount of phosphate, nitrogen, and potash. It is designed to be an all-around fertilizer. Triple Pro contains ammoniacal nitrogen, sulfur, and urea. It is a perfect economical choice for pre-plant and application for various plants, such as vegetables, trees, citrus, and ornamentals. The fertilizer is in the form of pellets, that contains all of the ingredients, so there is no streaking because of particle segregation.

  1. YaraMila 15-15-15 Fertilizer

The triple 15 combinations of nitrogen, phosphorus, and potassium are designed for yield maximization and increased quality. It is formulated to meet the requirements of the crop and is one of the most highly efficient sources available. The fertilizer comes in pellets that are balanced, so when applied correctly and evenly, there is a prevention of particle segregation and streaking. It can be spread by hand or machine to the field and offer a combination of nutrients perfect to increasing yield. The fertilizer contains ammonium-N and nitrate-N, which is perfect for growing crops and works to ensure that the roots are developing strong. Plus, the phosphorus is plant available, so it can provide a longer-lasting supply of phosphorus for the crops regardless of the soil type.

  1. Peters Excel 15-15-15 Cal-Mag Special

Peters Excel fertilizer is designed to provide the right amount of nutrients for a garden and includes calcium, magnesium, and micronutrients. It is ideal for lilies, foliage, orchids, roses, bedding, and landscape and potted plants. It is designed for seedlings, to help provide them with weekly nutrition that promotes strong root health, lush and dark green foliage, and stronger stems.

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Applying 15-15-15 Fertilizer

Ensuring you use the right amount of fertilizer is important. This guide aims to provide an idea of how much fertilizer to use for different plants to help them grow successfully. It is based on industry standards and results will vary depending on the actual triple 15 fertilizer that is used. Additionally, there may be some local recommendations that can help to increase yields, because not all soils contain the same amounts of nutrients, to begin with. Contact an agronomist in your area for recommendations and use this as a general guide.

Apple Trees

Established orchards should put between a half a pound and a pound of triple 15 fertilizer for each tree. Orchards with a lower density may need about 5 pounds of fertilizer per tree. This should be applied post-harvest and during spring flowering.


Apply 200 to 300 pounds of fertilizer per acre at the beginning of the grove establishment.


Apply between 600 and 1000 pounds of triple fifteen fertilizer per acre with half of it during planting, a quarter of the fertilizer three weeks to a  month later, and the remaining six to seven weeks after planting.

Table Grapes

Apply between 300 and 600 pounds per acre. Half of the fertilizer should be applied prior to the bud break and the rest after the bloom.

Wine Grapes

Apply 200 to 500 pounds per acre with a half prior to bud break and the remainder after bloom.


Apply between 400 pounds and 1000 pounds of triple 15 fertilizer in a split application per acre. Only a quarter of the product should be applied during planting and the remainder be applied in two or three applications later on.


Apply between 100 pounds and 150 pounds per acre of fertilizer.


Apply between 500 pounds and 800 pounds of triple 15 fertilizer per acre in two or three applications.

It is easy to see that the amount of fertilizer is important because every type of plant needs different amounts of these key chemicals. These recommendations also vary by location, because various soils have deficiencies in certain nutrients, which would require higher levels of certain nutrients to yield high returns. However, regardless of how much fertilizer is used for your plants, it is clear to see that the best yields and the yields with the highest quality are not deficient in these nutrients.

Triple 15 fertilizers work to provide plants with the essential nutrients they need to ensure that they have strong roots that work to absorb the nutrients from the soil that are needed for growth and development. They help to strengthen the stem, which can help to support growth and the development of fruits and buds. They help to provide a darker green color, which helps in photosynthesis, which increases the amount of energy the plant has to grow and develop. Ensuring that your plants have these key nutrients is important and can make a huge difference in how fast the plants grow, how big they grow, and how fruitful their yields are. The point is to provide the plant with the nutrients it needs to grow faster, be stronger, resist more, and produce bigger yields.

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