Fir fertilizer - Tips for fertilizing firs and spruces

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Fir fertilizer - Tips for fertilizing firs and spruces: fertilizing

Tannin fertilizer is the general term for the fertilizer that is most suitable for coniferous plants. Absolutely clear that it is then not only for firs, but also for spruce, thuja, pine, juniper and other conifers. Particularly conspicuous with conifers is the tan, which prevents the pine fertilizer with magnesium.

A fertilizer for all coniferous plants

Conifers need a fertilizer that is different from other trees. They are often inadequately supplied with a simple NPK fertilizer and can develop deficiency symptoms - including the dreaded tan, which can be prevented with a fertilizer containing magnesium. Most coniferous plants do not differ in their need for nutrients so much that they would require a more specific fertilizer - the pine fertilizer does it for everyone.


Fir fertilizer contains more than the usual components sodium, phosphate and potassium. It consists partly of organic material, but also contains iron, magnesium and sulfur. The shares are variable, depending on the manufacturer. Tannin fertilizer, unlike other types of fertilizer, can be used year-round and does not differ in composition at different seasons. Since the coniferous plants are usually in the field and have the opportunity to expand their root network as needed, they can supplement missing nutrients quite independently. Plants that are kept in vats or in the room can not do this - for them, a special fertilizer that takes into account the seasons and growth phases in the composition, more suitable.

Application and dosage

Firs and spruces are fertilized from February to August, these are the months when the trees grow. Starting in August, they are preparing for hibernation and no longer need fertilizer until they start to drive out again next spring. 70 to 140 g of fertilizer per square meter is recommended per dose, depending on the size of the tree. The fertilizer is available between one week and ten weeks, depending on the weather and the ability to absorb, depending on the soil permeability, soil conditions and size of the tree. As a rule, fertilizer is re-fertilized every six to eight weeks. A tablespoon holds about 20 g of solid fertilizer, so the amount per dose is three or more tablespoons full of fertilizer.
The fertilizer is distributed around the tree on the ground and shallow, but evenly incorporated. When a tree has been replanted or moved, fertilization is also required, and may be more abundant. It may be up to 180 g of fertilizer per square meter. It is worth keeping the manufacturer's instructions for the required amount of fertilizer, at least roughly, because contrary to opinion one can also over-fertilize firs and spruces.

Epsom salt instead of pine fertilizer

Of course, trees in the field can grow without fertilizer - in the forest is not fertilized. However, pine fertilizer contains a nutrient mixture that not only provides green needles, but is also nitrogen-rich enough to grow plants much faster than they would in nature. If firs and spruces on your own garden plot grow slowly, then it is better to give less pine fertilizer. For beautiful green needles and a vital look provides Epsom salt. Epsom salt is a highly concentrated magnesium sulfate fertilizer, which is actually intended only as an additional fertilizer in brown needles. However, with careful dosage and to curb growth, the salt may also serve as the sole fertilizer. Epsom salt is available as a liquid mixture and as a dry fertilizer. If Epsom salt is applied dry, it should not only be worked flat into the soil around the plants. The plants must also be abundantly poured so that the fertilizer can dissolve in the water and be absorbed through the roots. Even with Epsom salts, it is important to pay attention to the manufacturer's instructions: The fertilizer must not be overdosed.

If it is not due to the fertilizer

Conifers do not only get brown needles when the soil is too low in nutrients, but also for other reasons. So before fertilizing abundantly and excessively, you should carry out a soil analysis - this applies to a planned fertilization with pine fertilizer as well as with Epsom salts. Even a strong soil compaction triggers the characteristic discoloration of the needles. A too wet location can also be a reason for brown needles. Additional fertilizer would not help the tree in such a case, but make the situation worse. Fertilizing only with Epsom salt can also cause the needles to turn brown, as a high magnesium density in the soil prevents the absorption of potassium.Therefore it may make sense to use the fir or conifer fertilizer instead of Epsom salt.

Nordmann fir

Incidentally, prolonged dryness and too much road salt in the winter, which reaches the garden via meltwater and rainwater, can also cause brown needles in coniferous plants. Apart from that, pests such as Sitka spruce and pine spp are also known to brown the needles of the infested trees. Fertilizing does not help in these cases.

Tips for quick readers

  • Firs, spruces, thuja and other conifers are generally better supplied with a pine fertilizer than with a pure NPK fertilizer.
  • In addition to nitrogen, phosphate and potassium, pine fertilizer also contains sulfur, iron and magnesium.
  • Magnesium and sulfur prevent the tan.
  • Nitrogenous pine fertilizers have an accelerating effect on the growth of coniferous trees. If the trees are more likely to grow naturally (ie slower), Epsom salt is recommended.
  • Epsom salt is an additional fertilizer consisting essentially of magnesium and sulfate. The mixture leaves conifers fresher and greener.
  • Fertilization takes place between February and August: During these months, trees are in the growth phase and require additional nutrients.
  • When fertilizing you should always follow the manufacturer's instructions: over-fertilized trees suffer health.
  • Tannin fertilizer and Epsom salt are distributed around the tree in the soil (the amount depends on the size of the tree and square meters of soil available) and is shallow and evenly worked.
  • If fertilized with solid fertilizer, it should always be poured abundantly afterwards.
  • Fir trees need loose soil and a location that is not too humid - brown needles may also be due to soil compaction or waterlogging.
  • Conifers are flat-rooters, dryness can be a reason for brown needles. Other reasons that have nothing to do with fertilization are road salt and pests.

Worth knowing about fir fertilizer shortly

From autumn to spring conifers such as the fir should not be fertilized, as they are then not in the growth phase. The supply of water can not hurt during this time, but it is not absolutely necessary. Fertilization takes place only from February / March. Here, pine fertilizer or Epsom salt can be used. However, never fertilize before the plant was first watered! Only if you have already poured once or the soil is still wet due to the rainfall, you can assume that the pine fertilizer works sufficiently.
  • The fir fertilizer uses various nutrients, such as nitrogen, to supply the plants.
  • Magnesium is also present in large quantities in pine fertilizer. This combats the lack of magnesium in the soil.
  • On the other hand, the magnesium can counteract a brownish discoloration of the needles, which occurs especially in the spring by switching from low light and sun to much light and sunshine.
  • With the right pine fertilizer and the use of Epsom salt, it is possible to prevent these discolorations or to completely treat them off again.
  • In the case of Epsom salts, for example, a dosage of 100 to 200 milligrams per square meter makes sense for the curative treatment.
  • For a preventive treatment you should choose a dosage of 50 to 200 milligrams.
  • Dependent is the best dosage but not only of the plants, which one wants to fertilize with Tannend├╝nger, but also of the used Tannend├╝nger itself.
  • Here you should also pay attention to the price, which should be no more than about two to three euros per pack.

Video Board: How to Fertilize Evergreen Trees.

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