Thuja turns brown » Fertilize with Epsom salt? (tree of Life)

If the thuja turns brown, this often, but not always, indicates a deficiency. Therefore, many gardeners believe that they are doing the tree of life good by additionally fertilizing the hedge with Epsom salt. However, excessive fertilizing with mineral fertilizers can really harm the thuja. Epsom salt is not useful on brown needles.

Epsom salt is only useful if there is a magnesium deficiency.

When does it make sense to fertilize Thuja with Epsom salt?

Epsom salt compensates for magnesium deficiency. Only when this is present can it make sense to supply Epsom salts to the tree of life.

Only when you are absolutely sure that there really is a magnesium deficiency should you use this mineral fertilizer. Therefore, it is advisable to take a soil sample and send it to a laboratory for analysis.

Yellow needles indicate magnesium deficiency.

If the thuja needles turn yellow, the hedge is most likely suffering from a magnesium deficiency. This can happen even if you have been fertilizing regularly. Magnesium is soluble in water and is washed away by rainwater.

When is Epsom salt given?

  • fertilization in april
  • cloudy day
  • Water the soil before and after
  • Administer Epsom salts as directed

If it is absolutely certain that there is a magnesium deficiency, fertilization with Epsom salt is the order of the day. It is best to do it when the thuja sprouts in April. Sometimes an additional fertilization is necessary in the summer before the second flush.

On the day of the Epsom salt fertilization, the sky should be cloudy. The soil is pre-watered or fertilized after a rain. If heavy rains are expected, you should postpone fertilization. The Epsom salts will then wash off and possibly collect on other plants, causing them to over-fertilize.

How do you fertilize yours with Epsom salt?

Epsom salt can be dissolved in water and sprinkled or placed directly on the ground.

The solution is sprayed on the underside of the leaves, but not too close to the trunk.

When given in solid form, Epsom salts are sprinkled around the tree of life. It should not get too close to the trunk and much less directly to the roots.

Follow the manufacturer’s instructions for dosage. In heavy soils, the concentration is higher than in light soils.

If the needles are brown, do not add Epsom salt.

Brown needles and tips are not a sign of magnesium deficiency, but indicate a pest or fungus infestation. Sunburn damage, frost damage, or overly dry soil are even more common.

If yours turns brown, it could also be due to excess nutrients or over-fertilization. This attacks the roots, they burn and can no longer absorb water.

Therefore, it is important that you do not over-fertilize a thuja, but instead give it too little fertilizer than too much.


If you fertilize your hedge with organic materials such as mature compost, manure or horn shavings (€32.93), you run no risk. An oversupply is impossible because the nutrients are only released slowly.

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