Yellow leaves, reduced size, rare flowers: the plant does not find what it needs in the soil anymore to develop. Before jumping to the garden centre to buy a bag of fertilizer, take time to analyse and determine the type of deficiency, and find the best solution.
Nitrogen deficiency (N) Nitrogen is a fundamental element for the development of the vegetal; main component of chlorophyll and proteins, it stimulates the growth of the plants.

A plant full of nitrogen bears large and bright green leaves and beautiful stems. In case of a lack of nitrogen, the plant’s growth is delayed, small stems and leaves, yellow and old leaves, which then falls.
Stems can sometimes turn red. Blossoming and fruit-forming are also affected (small fruits of poor quality and early ripening). The most concerned plants are: leaves vegetables, sunflower, cereals, green plants, grapevine (blossoming, fruit-forming), fruit-growing…

How to rectify a nitrogen deficiency?
An excess of humidity is one of the main causes of nitrogen disappearance. To avoid the washout and nourish the ground with nitrogen, ventilate the ground, reform the mold layers (rich source of nitrogen) cultivate green fertilizers and effectuate organic or minerals fertilizer injection: blood powder (a strong boost action), crushed horn, comfrey manure…