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Natural fertilizers for indoor plants

As with the vegetable patch and the ornamental garden, indoor plants can escape chemical fertilizers which end up, at the end of the chain, in nature, after having required gray energy upstream during the industrial manufacturing process. The alternative is to use “homemade” natural and organic fertilizers for indoor plants specially adapted to the plants of the house but also of the terrace, that is to say, the smell of which is not disturbing. ! …

Coffee grounds, a well-known fortifier of green plants

Coffee grounds, a well-known fortifier of green plants

Generally, the coffee grounds end up in the compost, which is beneficial since it acts as an activator but if you do not have a composter, or if you have too much coffee grounds (not too much for the compost). !), then use it as a fertilizer for your indoor plants, your balcony planters, your terraced pot garden, your heather soil plants …

Coffee grounds are part of the slowly decomposing organic fertilizers which act over the long term, unlike “boost” fertilizers.

Fertilizer supplies plants with the essential elements that they would normally find in the soil. However, in pots, when the plant has exhausted the nutrients contained in its soil, it must be fertilized. To do this, coffee grounds, rich in nitrogen (N) 2%, and a little less in phosphorus (P) 0.3%, potassium (K) 0.3%, magnesium is particularly well suited. As it is also acidifying, heather earth plants (hydrangea, azalea, rhododendron, etc.) demand more.

Two methods of using coffee grounds as a fertilizer are possible:

  • Sprinkle with water to which you will have added the coffee grounds recovered from your coffee maker, whatever it is (Italian, plunger, filter, percolator…); the use of capsules makes it almost impossible to recover the grounds;
  • Mix coffee grounds with the potting soil during repotting or, if the size of your plant is such that you only practice a surfacing, place the coffee grounds at the foot of the plant and gently scratch to incorporate it a little into the existing soil.

Tea and infusion bags, fertilizers for indoor plants

If you are more tea than coffee or if you prefer to take an infusion than tea at the usual time of “tea time”, do not throw your bags in the trash. As with coffee grounds, you may be used to sending them to the composter, but nothing prevents you from using them to invigorate your green plants or your patio plants.

Tea and infusion bags, fertilizers for indoor plants

In all cases, as with coffee for that matter, it is strongly recommended to use only organic products. For tea leaves or medicinal plants in sachets, only compost the whole sachet if it is not closed with a metal clip and only if the sachet (or the filter) is made of cellulose because the nylon sachets will not decompose.

The process consists of pouring the cooled bottom of the teapot, if you have prepared too much, on the soil of the plants, in watering. You can also directly sprinkle the top of the substrate with the infused leaves, they will form a nutrient blanket for your potted plants.

It seems that even the bottoms of wine glasses cut in half with water, when serving the Sunday table, are good for these same plants! And to find out more, a focus on the maintenance of indoor plants has been added to the new, more dynamic and clearer edition of the essential book. I prepare my potions for the garden* by Brigitte Lapouge-Déjean, organic gardener and Serge Lapouge, gardener and photographer. The contents of the book have been redesigned with a few additions, and then identical recipes that have been proven, as well as others that have been revisited, to facilitate you the right dosages and the right uses.

* Living Earth Editions – coll. Easy & organic – April 14, 2021 – 144 pages – € 14