Here I show an update on my 2 yr old Rain Tree mini bonsai and convert it into a self watering pot. The substrate now is crushed bricks and sits in a pool of water.
This is a 2 yr progression of a ficus mini bonsai from seed, growing hydroponically in a bottle cap. The roots in water are sacrificial and will be eventually cut off but they give me a much faster growth than possible in my soil-mix of the same volume.