Penicillium Mould: Where It Grows and Why It Matters

Named after the antibiotic it famously produces, Penicillium is paradoxically both a medical breakthrough and a household health hazard. It’s the second most common indoor mould in Adelaide and one of the fastest-spreading.

Identifying Penicillium

Penicillium typically appears blue-green or grey-green with a velvety texture. It has a strong musty odour and spreads rapidly through spore release. In Adelaide homes, you’ll find it on water-damaged walls, carpet and underlay, wallpaper, and stored fabrics.

Health Concerns

Penicillium is a prolific spore producer. In confined indoor spaces, concentrations can reach levels that cause chronic sinus infections, asthma flare-ups, and allergic alveolitis (hypersensitivity pneumonitis). Children in mould-affected homes show higher rates of respiratory illness. Read our complete health risks guide.

The Adelaide Connection

Penicillium loves the conditions found in Adelaide’s winter: cool temperatures, moderate humidity, and organic materials to feed on. Homes with rising damp in Burnside and Norwood provide sustained moisture that Penicillium needs. If you’re finding blue-green mould recurring despite cleaning, the moisture source hasn’t been addressed. Professional mould testing can confirm the species and guide appropriate remediation.