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What is Plant Fertilizer?

Fertilizer is food for plants. It can come from natural or synthetic origins. This food provides elements and micronutrients for plant growth. Fertilizer can stimulate plant growth, improve and increase the quantity and quality of blooms, and help enrich root growth. It can make plants healthier and grow faster. If over-applied it can cause something called fertilizer burn which makes plants sick and weak. Plant fertilizer is applied to the soil or foliage of plants. 

How Much Fertilizer Per Plant?

For our Slow Release Fertilizer, use 2 teaspoons per gallon pot size or 1 teaspoon for each foot of height. Our 8 ounce bag of plant food can feed eleven 1 gallon plants, four 3 gallon plants, or three 5 gallon plants. For any other plant fertilizer read the instructions on the bag or container before applying it to your plants.

How to Use Plant Fertilizer

Our Slow Release Fertilizer can be mixed into the top 1 to 3 inches of soil or simply spread over the top of the soil and watered in well. It slowly releases food for your plants over time. Apply every 6 months for best results, especially if you have nutrient deficient soil. If your soil is healthy and nutrient rich, you can apply once yearly in spring.

How Does Fertilizer Affect Plant Growth?

Nitrogen promotes plant growth, development, reproduction. It is the main component of chlorophyll. Potassium helps with growth and the reproduction of plants. Potassium regulates carbon dioxide uptake by opening and closing the stomata. It also activates many growth related enzymes and increases root growth and improves drought resistance. Phosphorus stimulates root development and improves flowers and seed production as well as stem sturdiness. It improves plant quality and increases resistance to disease.


Fertilizer can negatively affect beneficial microorganisms and the plants themselves when applied excessively. Excess fertilizer leads to excess salt in the soil which causes fertilizer burn. It also lowers the pH creating an overly acidic environment. This reduces the availability of nutrients to plants. 

What Plant Fertilizer Works Best?

We believe strongly in our specially formulated slow release fertilizer. We blended macronutrients, nitrogen, potassium, and phosphorus with important micronutrients, calcium, magnesium, manganese, iron, molybdenum, zinc, and copper in a continual release formula for total plant health. Plantingtree Slow Release fertilizer works for up to six months on shrubs, trees, plants, vegetables, fruit trees, herbs, and more. The polymer coated pearls won’t burn plants.  

What are the Main Components of Plant Fertilizer?

The main components (macronutrients) of fertilizer are nitrogen, phosphorus, and potassium. Micronutrients like iron, magnesium, zinc, copper, boron, calcium, molybdenum, chlorine, cobalt, and manganese are often added as well.

Where to Buy Plant Fertilizer

Find plant fertilizer for sale online at PlantingTree. We are a family owned and operated online plant nursery that takes pride in our plants, trees, and products for sale. Buy plant fertilizer online and have it shipped to your home! Scroll up to browse our plant fertilizer for sale.

Featured Plant Fertilizer

Continuously feed your plants for up to 6 months with PlantingTree Slow Release Fertilizer. Our specially formulated plant fertilizer will keep you plants healthy and happy with a blend of nutrients that provides just what they need.


Our Very Berry Fertilizer is for use on blueberries, raspberries, blackberries, and strawberries. You will have healthy plants and an abundant fruit harvest. This slow release formula feeds plants for 6 to 8 weeks.


Espoma Holly-Tone is an organic fertilizer with natural ingredients including enhanced BioTone microbes for ideal growth. Use this slow release formula on evergreens, hollies, azaleas, camellias, dogwoods, blueberries, and any acid loving plants.


Fertilome Rose and Flower Food with Systemic Insecticide feeds rose bushes and treats pests in one step. Keep you roses healthy and pest free with this two in one rose product. Treats aphids, whiteflies, mealybugs, scale, Japanese beetles, and more.


Add beneficial microorganisms and healthy organic material to your soil with Daddy Pete’s Barnyard Fertilizer. Improve your soil and feed your plants. For use on your lawn and garden plants.

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Use Daddy Pete’s Organic Fertilizer on trees, shrubs, roses, lawns, vegetables, fruits, herbs, and more. This multi-purpose fertilizer will keep all your plants healthy with its natural blend of nutrients. 


Improve your soil with Roots Tree Saver. This product encourages healthy root systems and faster establishment. Terra-sorb improves water retention and absorption while mycorrhizal fungi, beneficial bacteria, and humic acids create the perfect soil environment for new plants and trees.


Check out our Plant Care Products and Specialty Soils for more plant care options.

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