The oldest Jars we have at Pikaplant were sealed over 5 years ago, and the plants inside are still very much alive today.
There are many factors that can influence your Jar’s life expectancy, which can be anywhere between 3 months and 5 years or more. Increasing the lifespan may require some maintenance. Have a look at your plant every once in a while, and try to see if there is anything out of the ordinary. Each species has specific issues that you should try to fix, and some that are just fine and can be left alone. Maintenance might require you to remove parts of the plant. The core of the ecosystem lives in the soil, so do not be afraid to open your Jar and to help it live longer.