Basil: the simple kitchen trick for stronger plants

A flourishing basil plant on the windowsill is, for many people, the essence of summer: fresh leaves for pasta, salads or pizza always within reach. In reality, however, it often turns out differently. Within just a few days, a shop-bought pot starts to droop, its leaves become pale and the compost looks depleted. Yet a simple trick using everyday kitchen leftovers can noticeably strengthen the plant - without the need for expensive specialist fertiliser.

Why basil wilts so quickly

Basil has a reputation as the diva of culinary herbs. It looks richly green in the supermarket, but suddenly seems delicate once it is at home. This is not solely down to watering mistakes; the way the plants are grown also plays a part.

• The pots are usually planted extremely densely.
• The compost is designed for a quick sale rather than a long lifespan.
• Most nutrients are largely used up after only a few weeks.
• Mistakes with water and light put further strain on an already stressed plant.

Even when the amount of water is roughly right and the pot is in a reasonably sunny position, growth often stalls. The plant produces very few new leaves, the stems become woody and the flavour fades. This is exactly where the kitchen trick comes in.

The two kitchen leftovers that really get basil growing

The answer is not expensive liquid fertiliser from the garden centre, but ordinary household waste: coffee grounds and eggshells. Both are thrown away every day in many homes, yet together they can nourish basil surprisingly effectively.

The mix of dried, ground eggshells and damp coffee grounds works like a gentle, natural fertiliser that does not burn the roots.

What coffee grounds do for the plant

Coffee grounds contain nitrogen above all else. This is precisely the nutrient that encourages leaf growth in basil. Nitrogen supports the formation of chlorophyll, the green pigment in leaves. When the plant receives a good supply, the results include:

• stronger, denser foliage