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What Fertiliser Should You Use for Geraniums? (Australian Guide)

Like all flowering plants that you grow in the garden, geraniums will benefit from a fertiliser that has adequate amounts of nitrogen, phosphorus and potassium.

Geraniums are one of the easiest plants to grow in your garden and they require minimal care.

However, if you want your geraniums to really shine and produce an abundance of blooms, a little feeding will get the desired results.

Here is a guide to the best fertiliser to use.

Fertiliser content

Like all flowering plants that you grow in the garden, geraniums will benefit from a fertiliser that has adequate amounts of nitrogen, phosphorus and potassium.

Nitrogen promotes strong and healthy green growth. Phosphorus helps to develop a strong root system and potassium encourages flowering.

So, you want to look for a fertiliser that has a reasonably balanced N:P:K ratio.

Most fertilisers available will usually have more nitrogen than phosphorus or potassium.

Therefore, look for one that has a higher level of potassium than phosphorus as that will indicate that it’s particularly suitable for flowering plants.

Controlled-release organic fertilisers

One of the best ways to keep your geraniums healthy is to use a controlled-release organic fertiliser.

Fertiliser 1 | Plant care

Dynamic Lifter is my all-time favourite but there are others. I particularly like this product because it’s organic and also helps to improve the soil.

Basically, I’ve been using this in all my gardens for years and always get excellent results.

Here’s a basic breakdown of both Dynamic Lifter and other fertilisers I would recommend:

Yates Dynamic Lifter Soil Improver and Plant Fertiliser

Its main ingredient is composted chicken manure and it has added fishmeal, blood and bone,  and seaweed and comes in pelletised form. The N:P:K ratio is 3.6: 1.1: 1.7.

Just a word of caution if you have pets, especially dogs. Make sure that you rake it into the soil and keep your dogs away from the area as it can be toxic if consumed by them.

My standard poodle is definitely attracted to the smell but I make sure that she doesn’t go anywhere near it and always store the bag in the garage covered.

Rooster Booster Organic Fertiliser

Rooster Booster is another organically certified fertiliser that comes in pelletised form.

It’s based on composted chicken manure and has an N:P:K of 3.0: 2.0: 2.0.

Although the potassium is not greater than the phosphorus, this is about as balanced as you can get.

Earthlife Flower Blend

This is another organic fertiliser that I’ve recently discovered. It’s formulated from rock minerals and does not contain any animal products.

Therefore, it’s likely to be safer for use around gardens where your pets like to roam.

Its N:P:K ratio is 1.5: 2.5: 2.7. This is one of the better nutrient ratios for flowering plants that I’ve come across. It can even be used in pot plants.

However, it’s only available in selected garden centres or you can purchase it online

Liquid fertilisers

My favourites of all the liquid fertilisers available are Seasol Powerfeed and Charlie Carp.

Charlie Carp | Plant care

Here’s a quick rundown of these products.

Seasol Powerfeed

This comes in a variety of different formulations but all contain liquid seaweed extract with added nutrients.

My recommendation for geraniums would be Seasol Powerfeed for flowers, fruit and citrus which is in a purple bottle. It has an N:P:K ratio of 10.0: 2.0: 9.0.

Charlie Carp All Purpose

This product is a liquid fish concentrate with an N:P:K ratio of 10.0: 1.0: 6.0.

This is particularly good for flowering plants such as geraniums.

 FAQ:

How do you keep geraniums blooming?

To keep your geraniums blooming, feed in spring with an organic controlled-release fertiliser that is high in potassium. Alternatively, you can use a similar liquid fertiliser and apply this every 3 to 4 weeks.

When should you fertilise geraniums?

Geraniums should be fertilised in spring if you’re using a controlled-release fertiliser. If you prefer to use a liquid fertiliser, apply this every 3 to 4 weeks, especially during the warmer months of the year.

What does Epsom salt do for geraniums?

Epsom salt helps to balance a magnesium deficiency in the soil. If your soil is magnesium-deficient, using Epsom salt can help your geraniums grow and bloom better.

Do geraniums like Seasol?

Geraniums definitely like Seasol. However, original Seasol is not a fertiliser but a soil conditioner. To give your geraniums a better boost, select Seasol Powerfeed which has added nutrients.

Is blood and bone good for geraniums?

Blood and bone can be used on geraniums. However, it does not contain a high level of potassium, so it may not promote abundant flowering.

Photo of author

Annette Hird

Annette Hird is a gardening expert with many years of experience in a range of gardening related positions. She has an Associate Diploma of Applied Science in Horticulture and has worked in a variety of production nurseries, primarily as a propagator. She has also been responsible for a large homestead garden that included lawn care, fruit trees, roses and many other ornamental plants. More recently, Annette has concentrated on improving the garden landscape of the homes that she has lived in and focused a lot of energy on growing edible plants as well. She now enjoys sharing her experience and knowledge with others by writing articles about all facets of gardening and growing plants.

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