The 5 Best Fertilizers for Geranium

Using the appropriate fertilizer is important for success when growing geraniums. Are you using the right ones?

You’ll need the best fertilizers for geranium to maximize growth. Not all fertilizers are created equal. Gardeners quickly realize that the average products you find in your local gardening store just do not produce the same results as quality products.

Geraniums are a longtime favorite of gardeners. They are relatively easy to grow, beautiful, and release a fragrant smell.

However, to maximize growth and ensure a healthy plant, quality ingredients and the proper N-P-K ratio is needed. Only the highest quality products deliver both of these. Many products on the market these days use marketing techniques to generate marketing hype.

The picks on this website were handpicked to give your plants robust growth. Below, I’ve organized them in an easy to read table with their respective N-P-K ratios. Keep reading below to learn more.

Pink flowers in the bloom when given ideal nutrients

Closer Look at Our Favorites

ALGOplus Geranium and Patio Plants Fod

N-P-K Ratio: 4-6-8

ALGOplus is the perfect plant food for both indoor and outdoor plants. The organic formula contains a balanced blend of nitrogen, potassium, and phosphorus, all of which help to nourish the soil, which in turn nourishes the plant’s roots. It also contains 12 different minerals, such as sulfur, iron, magnesium, and calcium, all of which deliver essential nutrients to the plant. Geraniums treated with ALGOplus are often healthier overall and display larger, brighter blooms. It is also very easy to use. It can be diluted with water and either sprayed directly onto the plant’s leaves or watered into the soil twice a week.

JR Peter’s Professional Fertilizer

N-P-K Ratio: 15-15-15

JR Peter’s product is specifically designed to enhance the appearance and health of geraniums and other plants that thrive in soil that has a neutral pH level. The blend contains high levels of nitrogen, which helps to nourish plants, and phosphorus, which ensures that the roots of the plant are strong and grow quickly. It also contains micronutrients, so gardeners can be sure that their plants are receiving the proper vitamins and minerals they need in order to thrive. The fertilizer is water-soluble and can be easily applied while watering the plants.

Fertilome Plant Food

N-P-K Ratio: 20-20-20

This plant food from Fertilome is designed to work well on both young plants and plants that are already established. The 20-20-20 blend of nitrogen, phosphorus, and potassium helps to nourish the soil and, in turn, produces plants that are stronger and healthier overall. Gardeners will often find that plants treated with it have sturdier root systems and produce larger, more colorful flowers. Geraniums treated with this product also tend to bloom more often and produce more flowers during each bloom. The blooming season might also be extended by using this plant food.

Dyna-Gro Bloom Plant Food

N-P-K Ratio: 3-12-6

Dyna-Gro Plant Food is an excellent choice when it comes to a balanced nutrients that can be used on a variety of plants, including geraniums, in order to promote plant health and encourage blooms. The plant food contains a carefully crafted balance of nitrogen, phosphate, and potash to encourage even growth and to nourish the soil. The mix also contains a number of essential minerals in order to ensure that plants are receiving the vitamins and nutrients they need to grow. In addition, this plant food is low in salts, which helps to reduce the risk of dehydration in plants. This also means that the plant food is unlikely to burn delicate roots or leaves.

Liquinox Bloom Fertilizer

N-P-K Ratio: 0-10-10

Liquinox’s product is specifically designed to create larger, more richly colored blooms in flowers such as geraniums. It has a balanced blend of phosphate and potash that helps to create a high acid level in the soil, enhancing the soil’s state and nourishing the plant’s roots. The fertilizer is very concentrated, but it’s easy to mix into a solution, which can then be applied during watering every three or four weeks. Liquinox can also be applied while plants are dormant or budded in order to encourage better overall health and larger, more frequent flowers.

This is the best choice if you are have significant trouble with flowering. It has no nitrogen content so that your plant will not direct energy into expanding foliage; instead it will direct more energy into the development of more blooms.

purple geraniums receiving enough sunlight.

Maximize Your Growth

To maximize your plants growth, you will need to set up successful circumstances to allow it to grow.

Proper Fertilization

Geranium grow most robustly with either balanced nutrients (N-P-K ratio of roughly 1-1-1) or products with less nitrogen content and more phosphorous and potassium content. The latter will encourage more blooms rather than having the plant divert energy into expanding foliage.

During the active months of growth (warmer weather), you will want to fertilize you plants roughly every 2 weeks. In the winter, you can fertilize less frequently or not at all. The goal in the winter months  is to let the plant go into its natural dormant stage.


The ideal soil is one that is loose and has plenty of organic matter. This will allow for proper drainage and good oxygenation.

Geranium do not do well with they are constantly sitting in soggy soil. When such an environment is present, it can result in an increased risk of root rot and root disease.

Pink geranium flowers with hints of maroon in the center.

Water Deeply

Geraniums do well when they are watered deeply and allowed to dry in between watering. Water as early in the morning as possible so that the sun can help to dry out the plant itself to prevent any risk of pests or disease. When you are watering, you want to minimize any splashing of watering onto the plant itself. The easiest way to do this is to use a soaker hose so that water can be directed at the roots.

Encourage Blooming with Proper Care

If you are having trouble with blooms we recommend removing spent flowers so that the plant can spend more energy in fresh blooms.

Again, another thing you may want to do is use nutrients with less nitrogen content. The last product on our list, Liquinox Bloom Fertilizer, is one such that would be great for this purpose.

Bottom Line

To wrap it up, I recommend buying the ALGOplus Liquid Fertilizer and if you are having significant difficulty with achieving blooms, then I recommend the Liquinox Fertilizer. These products will maximize the chances of healthy geranium and increase blooms. Don’t make the mistake of buy any average product at your local gardening store – not all products are created equal.  You cannot go wrong with any of the choices above. 

Jeffrey Douglas
Jeffrey Douglas own a landscaping company and has been in the business for over 20 years. He loves all things related to lawns or gardens and believes that proper maintenance is the key to preventing problems in the first place.
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