Mini greenhouses provide a convenient way to germinate seeds indoors and prepare them for transplanting in their appropriate season. Once the seeds have successfully germinated and sprouted, they can be moved outdoors for short periods to start the hardening process. After the plants are able to survive outdoor weather, they can simply be planted directly into the soil, as the pots are biodegradable.
Wash the mini greenhouse to remove any dirt from the tray and any fingerprints or smudges from the glass.
Make four 2 3/4-inch cuts at the base of each toilet paper roll. Fold the tabs inward and tuck the last fold under the first to create the bottom of the planting cups.
Fill each cup with potting soil and plant the seeds at the depth directed on their packaging.
Water each cup and place them in the mini greenhouse.
Place the greenhouse on a windowsill that gets at least 6 hours of sunlight a day.
Check the pots' soil daily and water if the soil is dry.
Harden off the plants by exposing them to the outdoors for increasing amounts of time over a week, and transplant the plants as they become too large for the greenhouse.