Indoor plants, unlike those in the garden, have limited access to soil nutrients. Fertilization thus becomes essential for harmonious growth, vibrant leaves and abundant flowering. This guide explores types of fertilizers, natural and chemical, and the correct way to use them to keep your plants in top shape.
Why choose natural fertilizers?
Using natural fertilizers is often preferable for indoor plants because:
Reduced exposure to chemicals: Chemicals can end up in the air inside your home.
Balanced nutrition: Provides nitrogen, phosphorus and potassium in an easily assimilated form.
Soil health: Maintains soil balance and offers a slow release of nutrients, contributing to uniform growth and long-term health.
Types of natural fertilizers and how to use them:
Sugar: One of the simplest aids. A teaspoon of sugar mixed in a glass of water can stimulate the growth process of all plants. Water the soil with this solution.
Coffee Grounds: Rich in nitrogen, phosphorus, minerals and potassium. Let the grounds dry on a newspaper for easier spreading. Use: Sprinkle and gently incorporate into the soil around the plant. For indoor plants, apply once every 6 months. For outdoor plants (roses, carnations, hydrangeas, rhododendrons, azaleas), up to 4 times per year.
Can be mixed into the soil at planting or transplanting.
Water from boiled vegetables: An excellent source of vitamins. Let the water cool completely and use it for watering plants once a week.
Carbonated mineral water (Stătută): When it loses its acidity, carbonated mineral water can be used due to its high mineral content. It is a versatile and safe solution for most plants.
Banana peels: Rich in minerals, they work as a slow-release fertilizer. Place 1-2 pieces at the base of the pot. Ideal for annual plants and roses.
Wood ash: An excellent source of phosphorus, potassium, calcium, iron, magnesium, zinc and sulfur. Use: Mix 2-3 tablespoons into the planting soil or sprinkle on top. You can also make a semi-liquid paste (1 tablespoon of paste per pot), applied every 6 months, more often for flowering plants.
pH Caution: Ash has an alkaline pH (not acidic, as sometimes mistakenly mentioned). For plants that prefer acidic soil, avoid ash or use it in very small amounts. To partially neutralize the alkalinity, some combine it with acidic materials, but it is simpler to use it on plants that tolerate a neutral to alkaline pH.
Onion skin tea (and disinfectant): Prepare an infusion of 50g onion skins in 1L of boiling water. Let stand for 3-4 hours, strain and spray on leaves and soil to prevent microorganisms and pests. Suitable for all plants.
Yeast: Dissolve fresh or dry yeast in the water from boiled rice, pasta or the water in which beans have been soaked. Water the plants with this solution once a month.
