Does Epsom Salt Help When Thuja Turns Brown?

Does Epsom Salt Help When Thuja Turns Brown?

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

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

also read

  • When do you need to fertilize thuja with Epsom salt?
  • Thuja turns yellow - the tree of life gets yellow tips
  • Thuja turns brown! What to do?

Only when you are absolutely sure that there is actually a deficiency in magnesium should you use this mineral fertilizer. It is therefore advisable to take a soil sample and submit it to a laboratory for analysis.

Yellow needles indicate a magnesium deficiency

If the thuja's needles turn yellow, it is quite likely that the hedge is magnesium deficient. This can happen even if you have fertilized regularly. Magnesium is soluble in water and is washed away with rainwater.

When is Epsom salt given?

  • Fertilize in April
  • cloudy day
  • Water the soil before and after
  • Administer Epsom salts according to instructions

If it is absolutely certain that there is a magnesium deficiency, fertilization with Epsom salt is recommended. It is best done when the thuja sprouts in April. It is sometimes necessary to top up in summer before the second shoot.

On the day of Epsom salt fertilization, the sky should be overcast. The earth is watered beforehand or you fertilize after a rainfall. If heavy rainfall is expected, you should postpone fertilization. The Epsom salt is then washed away and possibly accumulates on other plants, which are over-fertilized as a result.

How is thuja fertilized with Epsom salt?

Epsom salts can be dissolved in water and splashed or poured directly onto the ground.

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

When administered in solid form, the Epsom salt is scattered around the tree of life. It must not get too close to the trunk and certainly not directly to the roots.

The dosage is based on the manufacturer's instructions. The concentration is higher in heavy soils than in light soils.

Do not use Epsom salt if the needles are brown

Brown needles and tips are not a sign of a magnesium deficiency, but rather they indicate a pest or fungal attack. More often it is burn damage from the sun, frost damage or too dry soil.

If the thuja turns brown, it can also be due to an oversupply of nutrients, an over-fertilization. This attacks the roots, they burn and they can no longer absorb water.

It is therefore important that you do not overfeed a thuja under any circumstances, but rather give it too little rather than too much fertilizer.


If you fertilize your thuja hedge with organic means such as ripe compost, deposited manure or horn shavings (€ 6.39 on Amazon *), you are not taking any risks. An oversupply is impossible because the nutrients are only released slowly.