How to Fertilize Pelargoniums: A Practical Guide for Healthy, Blooming Geraniums

After choosing the right pot and the most suitable soil, there is another fundamental aspect to obtaining vigorous and generously flowering pelargoniums: fertilization.
Plants, just like us, need nourishment to grow, develop new leaves, and produce flowers. Understanding how and when to fertilize allows for better results, avoiding errors that could compromise the plants' health.

 

Pelargoniums in the ground and in pots: what are the differences?

Nutritional needs change depending on where the plant is grown.

Plants in the ground

Pelargoniums grown in the garden generally require less fertilization than those grown in pots. The roots can explore the soil and independently find some of the necessary nutrients.
If well-rotted compost was incorporated into the planting hole at the time of planting, further fertilization is often superfluous.
For those who wish to promote more vigorous growth, it is still possible to apply a balanced slow-release fertilizer for flowering plants once or twice a year.
In any case, it is important to always follow the instructions on the packaging. When unsure about the correct dosage, it is preferable to use smaller quantities rather than exceeding, thus avoiding the risk of damaging the plant.

Potted plants

When pelargoniums are grown in pots, fertilization becomes essential.
The roots have a limited volume of soil, and nutrient reserves are progressively depleted. To keep plants healthy, compact, and full of flowers, regular intervention is therefore necessary.

 

Solid and liquid fertilizers: which one to choose?

There are different types of fertilizers, each with specific characteristics.

Solid fertilizers

Solid fertilizers can be:

• traditional granular;
• slow-release granular;
• powdered to dissolve in water.

Slow-release fertilizers represent a practical solution because they gradually release nutrients over several weeks.

Liquid fertilizers

Liquid fertilizers are diluted in irrigation water following the instructions on the label.
Their main advantage is their rapid action: the effects are often visible in a shorter time compared to solid fertilizers.

Organic or synthetic fertilizers?

Another important distinction concerns the origin of the fertilizer.

Synthetic fertilizers