A lot doesn't always help a lot
In many gardens there is more of a nutrient excess than a nutrient deficiency. In particular, the phosphorus content of many soils is extremely high. An excess of nitrogen means that the shoots do not mature enough. the hydrangea becomes sensitive to fungal diseases.
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Even if the soil has an excess of a certain nutrient, it does not mean that all nutrients are in abundance. In numerous gardens, for example, there is a deficiency in important trace elements such as iron, potassium or manganese.
If you suspect over-fertilization, first analyze the soil
Since you cannot tell which nutrients are present in the soil, it is advisable to have a soil sample examined in a laboratory from time to time. If you have the suspicion that the hydrangea will not thrive due to over-fertilization, you should only apply an appropriate mineral fertilizer after this analysis. You will often receive a fertilizer recommendation as an attachment to
Soil analysis.Two fertilizers a year are sufficient
Fertilize You the hydrangea with a nitrogen-stressed special fertilizer with a low phosphorus content. The composition of the fertilizer can be found on the packaging. Commercially available NPK fertilizers should have the ratio 8 + 5 + 7 and also contain the trace elements magnesium and iron.
It should be fertilized in spring and a second time in early summer. For garden hydrangeas, it is preferable to use solid fertilizers that you are good at in the ground incorporate. Container plants, which have a higher nutrient requirement, are fertilized with a special liquid fertilizer during the growing season from March to early August Hydrangeas provided.
Prefer organic fertilizers
Naturally grown fertilizers such as compost or coffee grounds must first be broken down by microorganisms so that the nutrients are available to the plant. As a result, these fertilizers improve and promote the soil sustainably in the long term Plant growth. However, you cannot compensate for a nutrient deficiency with these fertilizers in a short time.
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Since the microogranisms work depending on the temperature and the weather conditions, the same amount of nutrients is not always available. This means that the risk of over-fertilization is much lower than with mineral fertilizers.