The glass garden
Build a small, living landscape
A terrarium begins with matching the plants to the container, not with arranging decorative stones.
Learn the difference between open and closed growing spaces, leave room for roots and air, and watch what moisture
does over several days. The layer planner turns inside dimensions into a practical shopping estimate.
Put an idea into practice →
Choose open or closed
An open container exchanges moisture with the room freely and suits a different planting style from a mostly
closed jar. Humidity-loving small plants can work together in a closed arrangement, while plants that need drier
conditions should not be selected merely because they are small. Group plants by their needs for moisture, light and
space. A large opening makes planting and later care easier. Clean the container before beginning and inspect its
shape from above as well as from the side; a narrow neck can make an attractive vessel surprisingly difficult to
maintain.
Give the layers a purpose
A lower layer of coarse material can provide a place where excess water is visible, but it does not create a
drain in a sealed vessel. Water that collects there still remains inside the container. Keep the growing medium
appropriate to the chosen plants, and allow enough depth for their roots without filling the jar to its rim. The
planner assumes a cylinder, so a rounded bowl or tapering jar needs an adjusted estimate. Add decorative stones last
and keep their weight from crushing delicate stems or compacting the planted surface.
Plant for the next month
Arrange the plants outside the jar first and imagine them a little larger. Leave access for trimming and avoid
pressing foliage tightly against the glass. Remove damaged leaves and use plants with healthy roots. A small spoon,
long tweezers and a soft brush can make placement neater, but simple tools are enough when the container has a
generous opening. Shape the surface with gentle changes in height rather than burying stems to create a dramatic
hill. A restrained planting often remains more readable and easier to care for as it grows.
Read the glass
Condensation changes with temperature as well as moisture, so a single glance does not describe the whole system.
Observe the jar at different times of day and watch the plants themselves. Persistent heavy wetness, damaged foliage
or standing water call for attention; a completely dry surface can mean something different in an open bowl than in
a closed jar. Keep the arrangement out of strong direct sun that can overheat the glass. Make small corrections and
give them time to show an effect, instead of repeatedly adding water on a fixed calendar.