Lavender (lavandula) naturally grows on poor, permeable Mediterranean soils, which is why it gained the opinion of a self -sufficient plant. However, in many gardens, the soil loses nutrients over time, and changing climatic conditions – drought or downpours – additionally hinder its development. Gentle feeding supports the root system of lavender, improves water intake and microelements, and in effect translates into more abundant flowering and healthier growth. This does not mean that lavender requires intensive fertilization – the key is moderation and a conscious choice of means.
Fertilization is particularly important in the poor in potassium, phosphorus or magnesium – elements that affect the quality of flowers and essential oils. What’s more, healthy plants cope better with diseases and pests, which is why fertilization is an investment in their longevity.
Lavender reacts best to organic fertilizers, i.e. compost or well -distributed manure. Compost is one of the safest and most universal fertilizers for lavender. It arises from the decomposition of plant residues (e.g. cut grass, leaves, kitchen waste) and is rich in natural nutrients, i.e. nitrogen (n), phosphorus (P), potassium (K) and microelements (magnesium, calcium, iron). It improves the soil structure, thanks to which it becomes more permeable and more effectively stores moisture.
A well -distributed manure also works, but beware: Fresh manure is too rich in nitrogen and can harm the plant, causing excessive leaf growth at the expense of flowers. If the soil is acidic (pH below 6.5), it is worth calculating it before, because lavender prefers an alkaline reaction (pH 6.5-7.5). Scepting is a one -time procedure that prepares the ground and reduces the need for frequent fertilization.
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Lavender does not like artificial fertilizersespecially those rich in nitrogen (e.g. ammonium nitrate) because it disturbs its natural growth cycle. However, if the soil is very poor and you do not have access to organic fertilizers, you can reach for ready preparations – but with your head. Look for fertilizers for Mediterranean or decorative plants, with low nitrogen (N) and high potassium (K) and phosphorus (P), e.g. in a proportion of 5-10-15. Potassium supports flowering and drought resistance, and phosphorus strengthens the roots and production of oils.
The best time for fertilization is Early spring (March-April), when lavender comes to life, or the beginning of summer (June), before the main flowering period. Use fertilizers in small doses – e.g. a thin layer of compost (approx. 1-2 cm) distributed around the plant. After application, gently water the soil so that the ingredients reach the roots evenly. Remember that lavender does not tolerate overflow – the soil should be slightly moist, but well permeable.
In fertile soils, fertilization may be unnecessary, especially if we have prepared the ground before planting. In this case, it is enough to add a little compost once every 2-3 years to keep the plant in form. Regularity is important, but do not overdo it – intensive feeding once a year may be less effective than subtle doses every season.
One of the most noticeable effects are flowers more saturated with color and more intense smell. Fertilizers supplying phosphorus (P) and potassium (K) support the development of inflorescences and the synthesis of Linalol and Linaralili acetate, the main ingredients of lavender oils. Studies published on sciencedirect show that appropriate phosphorus fertilization can increase the content of essential oils by 10-15% in varieties such as Lavandula Angustifolia.
Lavender is a plant adapted to dry conditions, but proper fertilization further increases its tolerance to a lack of water. The plant is doing better on hot days – the leaves remain elastic, and the flowers do not wither so quickly. A stronger root system, supported by microelements, reaches deeper in search of water, which reduces the need for frequent watering.
Fertilization also strengthens the natural resistance of lavender, making it less susceptible to pathogens and insects. Potassium increases the thickness of cell walls, hindering the development of fungi (Botrytis cinerea), and zinc and manganese support defense mechanisms. Lavender is less likely to suffer from phytophthorosis, and aphids and spider mites have less chance of attack. As a result, the plant retains a healthy appearance longer and does not require chemical spraying.
