Glass Jar Garden

Moss

Red sphagnum as drawn in the simulator

Red sphagnum

Sphagnum magellanicum

ModerateFine in a closed jar

A peat moss that turns wine-red in bright light. Very acid.

What the simulation uses

Light
8,000 to 50,000 lux
The brightness it grows well in.
Humidity
75 to 100 % RH
Air moisture it is happy in; below the lower end it dries out.
Temperature
8 to 30 °C
Comfortable range; outside it growth slows.
Dies at
below -20 or above 46 °C
Days beyond these temperatures kill it.
Soil pH
3.5 to 4.5 pH
Soil acidity it prefers.
Grows up
0.35 cm/month
How fast it gains height in good conditions.
Spreads
0.13 cm/month
How fast its edge creeps outwards.
Thickens
2.5 %/month
How fast its cover fills in on its own ground.
Copes with wet
excellent
How well it stands soggy soil; poor means rot comes quickly.
Copes with still air
good
Sealed jars have still air; poor means grey mould finds it.
Copes with shade
poor
How well it holds on in dim light.
Copes with drying
fair
How well it survives the jar drying out.
Water use
0.035 ml/cm²/day
Water that evaporates off the cushion each day in room air.
Holds water
0.25 ml/cm²
Water a cm² of moss soaks up and keeps.
Grows on
soil
Where it can take hold and spread. Moss that cannot grow on stone thins out there.

Care

Day length
10 to 14 h
Substrate
Wet

What kills it

Description

In the wild it builds hummocks in bogs and needs plenty of light. Watch the colour in your jar, since a deep red means it is getting enough. Use mineral-free water, because tap water minerals harm it.

Also called Magellanic bogmoss, red bog moss, S. medium / S. divinum (recent splits).

Estimated, where sources were thin: photoperiod for red colouring; temp_c.

Sources

Grow it in a jar