Old sponges, don’t throw them away: “they’re worth gold” | I always use them like this in the garden

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They reduce watering frequency — especially during hot weather.

This makes them perfect for gardens, containers, and planters.

2. Sponges Help Aerate Soil
The porous structure allows air to move through the soil more easily. This can:

Improve root development

Reduce soil compaction

Promote microbial activity

3. Sponges Reduce Waste
According to environmental estimates, the average household throws out dozens of sponges annually. By reusing them, you:

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Reduce landfill waste

Make your gardening more eco‑friendly

4. They’re Free
Once you buy a garden sponge or a kitchen sponge, you never pay for it again if you reuse it outdoors!

What Kinds of Sponges Work Best
Not all sponges are the same — and some are better suited for garden use than others.

✔ Cellulose Sponges
These are the classic, natural‑feeling sponges many of us grew up with. They are:

Highly absorbent

Biodegradable

A great fit for gardening

✖ Some Synthetic or Scrubber Sponges

Sponges with heavy plastic materials or abrasive scrubbing layers may not be ideal near edible plants, because:

They may contain chemicals

They don’t break down easily

Rule of thumb: If part of the sponge is purely plastic or metallic (like steel wool), don’t use it in your soil.

Top 10 Ways I Use Old Sponges in the Garden (and Why They Work)
1. Moisture Reservoir in Plant Pots
This is the most effective and commonly recommended method.

How to Do It:
Cut old sponges into small cubes (about 1–2 cm).

Spread these cubes across the bottom of your plant pots before adding soil.

Why This Works:
As you water your plants, the sponge pieces soak up and store water.

When the soil dries, they release moisture back into the roots.

✔ Best For:

Indoor plants

Hanging baskets

Planters in hot climates

Patio vegetables

2. Prevent Soil Compaction in Containers
Soil compaction suffocates roots, especially in deep pots.

How to Use Sponges:
Mix shredded sponge pieces into the potting soil (≈10–20% by volume).

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