Alder Cones

Alder Cones — A Bioactive Essential for Isopods & Millipedes

Alder cones are one of the most popular natural bioactive terrarium supplies for terrariums and isopods — and for good reason. These small, woody cones from the alder tree are packed with tannins and organic goodness, making them an outstanding enrichment item and food source for isopods, millipedes, and bioactive terrarium setups alike.

Why Isopods & Millipedes Love Alder Cones

• Rich in tannins — Alder cones release beneficial tannins into the enclosure, helping to maintain a slightly acidic, naturalistic environment that many isopod and millipede species thrive in.
• Natural food source — As alder cones slowly soften and break down, isopods and millipedes will graze on the organic matter, fungi, and biofilm that develop on the surface.
• Shelter & hides — Their compact structure provides cosy spots for isopods to tuck into, rest, and moult safely away from light and disturbance.
• Humidity support — Alder cones help retain localised moisture within the enclosure, contributing to the humid microclimate that most isopod and millipede species require.
• Bioactive-friendly — Perfect for clean-up crews and healthy ecosystems, they decompose gradually and naturally without disrupting your enclosure's balance.
• Beautiful aesthetics — Scattered across the substrate, alder cones add a charming, naturalistic forest-floor feel to any vivarium.

Benefits in Bioactive Terrariums

• Drives the decomposition cycle — As alder cones break down, they feed beneficial bacteria, fungi, and microfauna — the invisible engine that keeps a bioactive enclosure clean, balanced, and self-sustaining.
• Supports springtail colonies — Springtails thrive on the fungi and organic matter that develop on decomposing alder cones, helping to keep mould and waste under control.
• Natural pH buffering — The tannins released help maintain a stable, slightly acidic environment — ideal for tropical and temperate bioactive setups alike.

A high-quality organic material for bioactive setups UK-wide, suitable for reptiles, amphibians, and microfauna habitats, as well as all isopod and millipede species including Porcellio scaber, Armadillidium vulgare, Cubaris sp., Narceus sp., and many more.

Disclaimer: While every effort is taken to ensure our products are safe for use, we strongly recommend cleaning and sterilising them yourself before introducing them to your enclosure.