THE SCIENCE BEHIND WHAT NOBODY'S SAYING

Most plant advice skips the biology.
This is the biology.

Houseplants — The Unwritten is a science-based blog about what is actually happening inside your plants, your substrate, and the products on your shelf. Not what the label says. Not what the community repeats. What the peer-reviewed literature actually shows — and where it runs out.

No sponsorships. No confident recommendations without evidence. No answers where there are only questions yet.

Written by a Dutch plant obsessive working within the world of microbiology, based in Denmark.

LATEST POSTS

PRODUCT ANALYSIS

Physan 20 — Should We Use It?

The SDS lists severe skin burns and aquatic toxicity. The hobby recommends it preventively. Those two things are worth examining together.

SUBSTRATE BIOLOGY

The Invisible Garden

Your substrate is the most biologically complex environment your plant will ever inhabit.