The 5 Best Fertilizers for Geranium

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

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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 geranium, quality ingredients and the proper N-P-K ratio is needed. Only the best fertilizers 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 you the best results. Below, I’ve organized them in an easy to read table with their respective N-P-K ratios. Keep reading below to learn more.

Comparing Our Top 3 Recommendations for Geranium Fertilizers

Healthy and fragrant purple geranium

The Best Geranium Fertilizers

These are the best fertilizers for geranium. Each of them have the proper N-P-K ratios and utilize top notch ingredients. Be sure to read further below to find more tips on how to maximize the growth of your geranium.

Best Fertilizers for Geranium

N-P-K Ratio: 4-6-8
This liquid fertilizer 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. The fertilizer also contains 12 different minerals, such as sulfur, iron, magnesium, and calcium, all of which deliver essential nutrients to the plant. Geraniums treated with this fertilizer are often healthier overall and display larger, brighter blooms. The fertilizer 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.

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

JR Peter’s fertilizer 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. The fertilizer also contains micronutrients, so gardeners can be sure that their geraniums 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.

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 this fertilizer 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.

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

Dyna-Gro Plant Food is an excellent choice when it comes to a balanced fertilizer 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.

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

Liquinox’s fertilizer is specifically designed to create larger, more richly colored blooms in flowers such as geraniums. This fertilizer 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. The fertilizer 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 fertilizer if you are have significant trouble with enough flowering of your geranium. This fertilizer 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.

Maximize Your Geranium Growth

Geraniums were plants that were introduced in Europe by Dutch traders. Because of their beauty and fragrant smells they quickly became a popular plant around the world.

Proper Fertilization of Geranium

Geranium do best with either balanced fertilizers (N-P-K ratio of roughly 1-1-1) or fertilizers 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.

Soil for Geranium

The best soil for geranium 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.

Water Geranium 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 of your geranium.

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 fertilizer with less nitrogen content. The last fertilizer, Liquinox Bloom Fertilizer, on our list is one such that would be great for this purpose.

Bottom Line

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

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About the author: Carley Miller is a horticultural expert at TheGreenPinky. She previously owned a landscaping business for 25 years and worked at a local garden center for 10 years.

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