Can lime peels go in your worm bin?
Lime peels fall into the ‘with great caution’ category and should only be added in very small quantities to the worm bin. They contain a high content of citrus oils (limonene) and are very acidic, possibly even more concentrated than in lemons or oranges. These properties can disrupt the environment in the worm bin and be harmful to worms in too high concentrations. The peel itself is tough and also breaks down slowly.
How much lime can you add?
Add lime peels and other lime waste very, very limitedly to your Bonter. Think of occasionally only a few minuscule, finely chopped snippets of peel per week. The quantity must be minimal, otherwise it will accumulate and can cause problems. Always mix the small quantity thoroughly with a generous amount of dry ‘brown’ material (shredded cardboard, paper) to buffer acidity and absorb moisture. Observe your worm bin closely after addition; if worms retreat from the spot where you added citrus, stop adding immediately.
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What to do instead? Alternatives & waste management
Because lime peels require such great caution in the worm bin, other processing methods are often a better idea. Lime waste is more suitable for a traditional, large compost heap, where the acids and oils have less impact in a larger mass (although it still breaks down slowly). If your municipality collects organic waste bins, this is a more suitable destination for lime waste than your Bonter. Optionally use lime peels as a natural cleaner or air freshener in the home; this way they still get a useful purpose.
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Tips for safe lime composting
If you do decide to add a minimal quantity of lime peel to your Bonter, cut it into the smallest possible pieces to help the breakdown process somewhat. Mix the finely chopped pieces directly with a large amount of dry, ‘brown’ material (cardboard, paper) to buffer acidity and absorb moisture. Bury the lime scraps deep under the bedding to limit the strong smell and discourage pests (attracted by any leftover sugars). Closely monitor your bin after adding citrus; signs of disruption (worms fleeing, unpleasant odor) mean you’ve added too much. Despite the Bonter air filter, odors will escape less easily, but be extremely careful with citrus.
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Frequently asked questions about composting lime
Are lime peels harmful to worms?
Why can I only add very little lime?
Do lime peels break down quickly in the worm bin?
Does lime attract pests?
Can I make lime waste safer by treating it?
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