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Puerto Verde magnesium sulphate is a mineral powder fertiliser that provides magnesium, an essential nutrient for photosynthesis and plant development. It is used to correct magnesium deficiencies in orchards, gardens, greenhouses and farms, improving leaf colour, flowering and crop yields. It is 100% mineral, with no additives and dissolves easily in irrigation water.
What is magnesium sulphate and what is it used for in agriculture?
Magnesium is the central atom in chlorophyll, the molecule that enables plants to photosynthesise. When the soil or growing medium does not provide enough magnesium, plants cannot produce chlorophyll normally, and visible deficiency symptoms appear, especially on older leaves. Magnesium sulphate quickly corrects this deficiency because it is highly soluble in water and easily absorbed by the plant roots.
How to tell if your crop needs magnesium
- Yellowing leaves between the veins, while the veins themselves remain green (interveinal chlorosis), usually starting on the older leaves
- Slow or weakened growth despite regular watering and fertilising
- Less flowering or fruiting than expected for the season
- Premature leaf drop in plants with severe deficiency
- Crops that are particularly demanding of magnesium, such as tomatoes, peppers, grapevines, citrus trees, olive trees and rose bushes
- Sandy soils or soils heavily leached by abundant irrigation, where magnesium is easily lost
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Crops that benefit most from magnesium sulphate
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Tomatoes and peppers
Highly sensitive to magnesium deficiency, especially in intensive cultivation
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Grapevines
Deficiency affects the colour and ripening of the bunches
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Citrus trees
One of the crops where magnesium chlorosis is most visually noticeable
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Olive trees
Deficiency reduces olive production and quality
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Gardens and rose bushes
Improves foliage colour and flower abundance
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Urban gardens and potted plants
Easy to dose in small quantities for potted plants
How to apply magnesium sulphate step by step
- Identify the deficiency: confirm that the symptoms (yellow leaves between green veins) are due to a magnesium deficiency and not another cause, such as overwatering or underwatering.
- Dissolve the product: add the dose recommended on the label to a container of water and stir until completely dissolved. It is highly soluble and therefore dissolves easily.
- Apply to the roots: water the solution directly at the base of the plant, allowing the water to penetrate well into the growing medium or soil.
- Optional, foliar application: on some crops, it can also be applied as a spray to the leaves, diluted in water, for faster absorption in cases of visible deficiency.
- Repeat as needed: monitor the development of new leaves over the following weeks and repeat the treatment if the label or the crop's development recommends it.
Why choose Puerto Verde magnesium sulphate?
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100% mineral
No additives or fillers, just as it is extracted from mineral sources
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Highly soluble
Dissolves easily in water for irrigation and fertigation
♻️
Biodegradable
Leaves no toxic residues in the soil
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Made in Spain
A project committed to local employment and the environment
Learn more about naturally caring for your crops on our blog in the agriculture and gardening section.
⚠ Before applying: Always follow the dose recommended on the label for your crop and area. Avoid applying during the sunniest hours to reduce the risk of leaf burn if using it as a foliar spray, and keep the product out of reach of children and pets.
Frequently asked questions about magnesium sulphate
How often should magnesium sulphate be applied?
It depends on the crop and the severity of the deficiency. In general, it is applied when the first symptoms appear and repeated every 2–4 weeks until improvement is seen in the new leaves, always following the instructions on the label.
What is the difference between magnesium sulphate and an NPK fertiliser?
An NPK fertiliser provides nitrogen, phosphorus and potassium, the three main macronutrients. Magnesium sulphate specifically provides magnesium, a secondary but equally essential nutrient that is not always included in sufficient quantities in general-purpose NPK fertilisers. That is why it is used as a supplement, not as a substitute for regular fertilising.
Is it compatible with drip irrigation?
Yes, because it is highly soluble in water, it is suitable for drip irrigation systems and fertigation, provided that the recommended dose and dissolution instructions are followed to prevent dripper blockages.
Can it be used on potted plants and in urban gardens?
Yes, it is just as useful for houseplants, patio plants or potted plants in urban gardens as it is for crops grown in the ground, with the dose adjusted to the amount of growing medium according to the label.
Can I combine it with Agro pH reducer?
Yes, in fact they complement each other well: Agro pH reducer adjusts the irrigation water so that nutrients are available, and magnesium sulphate provides the magnesium that the crop needs. It is recommended not to mix them directly in concentrated form.
Where can I buy magnesium sulphate online in Spain?
You can buy Puerto Verde magnesium sulphate directly from this collection, with shipping throughout mainland Spain. You can also find it in our official Puerto Verde store on Amazon.
Learn how to care for your crops naturally
Discover guides and tips on agriculture and gardening on our blog.
