Question: iron

when is the right time to put iron in plants?

Answer: iron

Dear Marco,
iron is an essential mineral for plant development, since it is an important part in the development of chlorophyll, and therefore plants that cannot find it or absorb it from the soil if left for a long time without iron begin to fail to produce any more chlorophyll, assuming a characteristic increasingly lighter color, until it has almost yellow leaves; this problem is called chlorosis.
Iron is generally always present in the soil, also considering the fact that plants need quite modest quantities of this mineral; it happens however that some soils are particularly deficient in iron, as happens for example when plants are grown in pots, in the same land for some years in a row. Other plants are not able to assimilate the iron contained in the soil because the pH of the soil, or the presence of limestone, makes it scarcely available for plant roots.
For this reason it happens to have yellow leaves even if the plants are cultivated in the best way. For this reason it is often necessary to intervene with ferrous-based fertilizers, usually containing products called iron chelates, or bio-available iron for plants.
These fertilizers are also often called greening, and are usually given in cases of different types; if the plant that needs iron is a common plant that for some reason has started to turn yellow, the iron-based fertilizer is used immediately, as soon as we see that the leaves take on the characteristic color typical of chlorosis; in this case the greening fertilizer should be administered only once, and possibly a second one after about 15 days.
As for the acidophilic plants, which are notoriously often faced with problems due to the assimilation of iron from the ground, in general we supply fertilizer based on iron chelates every year, in spring, or when the plants are in full bloom vegetative, and certainly their demand for iron is greater. There are fertilizers based on iron chelates to be administered through the leaves, very effective, and also products to be dissolved in the water used for watering. In general it should also be remembered that a good quality fertilizer, whether it is for acidophilic plants, or even only for geraniums on the terrace or for vegetable plants, should always contain small percentages of iron, mixed together with the macroelements present in the fertilizers.