10 common items in your kitchen that double as plant fertiliser

The pursuit of lush, thriving houseplants doesn’t have to cost you thousands of rupees. Plant fertiliser alternatives may already be in your kitchen—simmering on the stove or tucked behind spice jars. Indian households have long reused tea leaves, ash, and peels, well before sustainability became a trend. Today, as zero-waste living and regenerative gardening gain momentum, the kitchen is being reimagined as a miniature soil lab.

Here are ten simple things from your kitchen that double beautifully as plant fertiliser, helping you cut both waste and costs.

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Read Also : India’s Tea Board is helping growers save crops from extreme weather,

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Banana Peels

Soft, nutrient-rich and fast to decompose, banana peels are great for flowering plants. Loaded with potassium, calcium and trace amounts of magnesium, they’re particularly helpful for plants like hibiscus, roses and tomatoes. You can chop them finely and bury them in the soil, blend them into a slurry, or let them steep in water for 48 hours to create a potassium-rich liquid feed. As they break down, they help improve soil structure too.

Used Tea Leaves

A pantry classic that doubles as a gentle nitrogen source. Tea leaves (without milk or sugar) add organic matter to the soil and improve drainage. They’re ideal for acid-loving plants like roses, hydrangeas, and garden ferns. Scatter the dried leaves directly into the soil or compost them for a milder effect. Just avoid overuse, as it can increase soil acidity over time.

Coffee Grounds

Once rinsed and dried, coffee grounds make excellent soil conditioners. Coffee is slightly acidic and rich in nitrogen, making it perfect for blueberries, camellias, or anthuriums. Sprinkle a thin layer on top of the soil, or blend into compost. It also attracts beneficial earthworms and repels garden pests like slugs. Moderation is key though—too much can inhibit water flow.

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Read Also : India’s Tea Board is helping growers save crops from extreme weather,

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Eggshells

Calcium is essential for healthy root development and preventing issues like blossom end rot in tomatoes and chillies. Crushed eggshells provide a slow-release source of this mineral. Rinse and dry the shells, then crush into a coarse powder before adding to your soil or compost bin. You can even soak them in water overnight to make a calcium-rich tea for your more delicate potted plants.

Rice Water

The milky liquid left after rinsing or boiling rice is surprisingly nutritious. It contains trace levels of nitrogen, phosphorus and potassium, which is the holy trinity of plant nutrition. Once cooled, it can be poured directly at the base of houseplants to encourage leaf and root development. Avoid adding salt or oil. For best results, use rice water once a week.

Vegetable Peels

Carrot tops, potato skins, cucumber ends, all belong in your compost bin, not the rubbish. As they decompose, they release a medley of micronutrients that benefit both foliage and fruit-bearing plants. In a pinch, you can even boil a mix of peels to create a quick compost broth. Once cooled and strained, this nutrient-infused water can be used to irrigate soil.

Onion Skins

Often overlooked, onion skins are rich in potassium, calcium and iron. They’re particularly useful during flowering and fruiting stages, when plants need an extra boost. To use, soak a handful of dry skins in a litre of water for two to three days. The resulting amber liquid can be used as a natural tonic. It’s virtually odourless and especially loved by marigolds, chillies and indoor succulents.

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Leftover Milk

Milk provides calcium, proteins and natural sugars that support beneficial bacteria in the soil. Dilute it thoroughly—one part milk to four parts water—and use it occasionally to water your plants. It’s best applied to outdoor plants or larger containers, as overuse can cause sour smells. Interestingly, this mixture can also be used to wipe broad leaves clean while deterring powdery mildew.

Stale Bread

While not a direct plant fertiliser, stale bread is an excellent carbon source in compost piles. It balances out moist, nitrogen-rich kitchen scraps like fruit and veg peels, accelerating decomposition. Tear the bread into small pieces and mix it with drier compost materials like leaves or shredded newspaper. The end result is richer, fluffier compost that feeds your garden long-term.

Ash from Wood-Fired Cooking

If you cook with a traditional chulha, tandoor or outdoor wood oven, don’t discard the ash. This ash, when used correctly, acts as a potassium-rich supplement and helps keep pests away. Scatter sparingly around flowering or fruiting plants, or add a small amount to compost. Avoid using ash from charcoal briquettes or chemically treated wood, as they may contain residues harmful to plants.

There’s a certain poetic symmetry in feeding your plants with what nourishes you too. These everyday kitchen items, when redirected with intention, become extremely useful plant fertilisers. They not only enrich your soil, but also invite a gentler, more sustainable rhythm into your home gardening routine.