Pile of dark brown worm castings on a white background

Worm castings

Worm castings are a mild organic amendment for custom potting mixes. Use a small amount for background nutrition and texture, not as a full substrate or fertiliser replacement.

Read full guide to Worm castings

€11,35

VAT included · plus

Size:

3l

Variant

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Worm castings: indoor use and sizing

Worm castings is a liquid feed intended for indoor plants. Use it as directed on the label and adjust dose to current growth.

Dosing: start low after repotting or during low-light periods, then adjust based on response.
Compatibility: follow the brand guidance for mineral/inert substrates if you use them.
Practical tip: mix fresh each time and avoid storing diluted solution.

Worm castings – gentle organic amendment for substrate recipes

Worm castings are useful where a custom blend needs a small organic nutrient contribution. They should stay in proportion with the rest of the recipe because their fine texture changes how the pot holds water.

Key points

Mild amendment: background nutrition for suitable mixes
Fine texture: softens very mineral blends
Small amounts: helps avoid a dense, slow-drying pot
Not for lean plants: skip carnivorous and ultra-low-nutrient substrates

Details

Pair a small amount with open materials such as bark, pumice, perlite or lava rock. That keeps the substrate from becoming too soft while still bringing an organic component.

More information

Worm castings do not replace an appropriate fertilising routine for plants that need regular nutrition. They are also unsuitable for carnivorous plants and other very lean systems.

At a glance

Use as directed on the label and dose to current growth. Start at the lower end of the range after repotting or during low-light periods, then adjust based on response.

If you grow in inert or mineral substrates, follow the brand’s guidance for that setup and avoid stacking multiple feeds at once.

Useful overview

Mix fresh each time and avoid storing diluted solution.
Rinse the pot occasionally with plain water if salts build up.
Store tightly closed and out of reach of children and pets.

Worm castings FAQs

What are worm castings used for?

Worm castings are a gentle organic amendment that can add mild nutrition and improve moisture behaviour in a mix.

Can I use worm castings as potting soil?

No. Use worm castings as a small ingredient, not as a full substrate. Too much can make a mix heavy and overly moisture-retentive.

Are worm castings suitable for every plant?

No. Avoid them for plants that need very lean or nutrient-poor media, including carnivorous plants, Lithops and many dry-growing succulents.

Fertilizing

Beginner’s Guide to Fertilizing Houseplants

Plant Care

The Ultimate Guide to Houseplant Substrates: Creating the Perfect Home for Your Plants

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