This is the ultimate solution if you want a plant in an unique enclosure with zero maintenance.
Really no watering, no manuring? Simple the plant is embedded in hydropearls. The sphere ensures that no water is lost, the pearls provide the nutrition.
Does it really work? The picture represents the current state of my Biosphere after one year.
Wow so what do I need to make one by myself?
Get a 6 mm alu tube and use it as socket strut
Get some hydropearls as soil
Get a 120 mm acrylic sphere
Get a plant which grows slowly and is able to live in an humid environment.
Pro Tip: Drill a small hole into the sphere close above the sphere socket to prevent fogging inside the sphere. Keep your plant out of direct sunlight.