Journal

Notes from the bench.

What we learn while planting, and what we get wrong. Mostly about water, light and moss — the three things a sealed jar is made of.

Written in the shop, published every other Tuesday. No newsletters about newsletters.

The sealed jar · diagram of a water cycle
Featured · Build guides 14 March 2026 · 8 minute read

The sealed jar: what actually happens to the water inside

A closed terrarium is a water cycle you can watch from the sofa. Where the moisture goes, why the glass fogs before breakfast and clears by lunch, and the one number that tells you whether to intervene at all.

With a cutaway drawing, the maths for a 4 litre vessel, and the reason we now leave the lid off for exactly one hour before sealing.

Read the article

Everything else

Six more from the archive

Newest first · all written by the two of us

Build guides
Build guides

Choosing a vessel: cloche, cube or carboy

The shape decides how much you can see and how often you have to reach in. A short guide to getting it right the first time.

4 February 2026 7 minute read

Plant care
Plant care

Condensation: what a foggy jar is telling you

A little fog in the morning is healthy. Fog that never clears is a message about light or water, and it is worth reading early.

12 December 2025 4 minute read

Stuck on a jar that has gone wrong? Send us a photograph and the date you planted it — that is usually enough for us to say what happened. We answer these before we answer anything else. Write to the workshop.
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