Chemical gardens can be considered as plant-like structures grown in a non-equilibrium self-organizing process creating complex structures. These biomimetic structures are formed when one seed of a metallic salt is immersed into an anionic dissolution, mainly a silicate solution. In this dissolution, the crystal of the salt starts to dissolve forming a gel around it, that acts as a semipermeable membrane. The water from the silicate dissolution flows in through this membrane towards the salt crystal driven by osmotic pressure. Then, the crystal continues dissolving and the internal volume increases. When the pressure inside the membrane rises, the membrane can break forming a hole. A jet of the internal fluid goes up due to buoyancy forces and the contact of this fluid with the external dissolution produces the precipitation of silicate owing to the different pH of the internal solution, forming the walls of tubes. The membrane formed around the crystals is permeable to H2O molecules and OH- anions. However, as the OH- anions would immediately react with the metal cations forming insoluble oxides-hydroxides on the internal side of the membrane, the concentration of OH– anions in the internal fluid is lower than in the external dissolution. The fluid dynamics is very complex within the internal chamber of these tubes and qualitatively the behaviour is similar with different inorganic cations. However, the differences in solubility of these cation salts, oxides, hydroxides or silicates can produce different ion concentrations in both dissolutions with steep chemical gradients, and then they can produce different morphology, textures, thickness, and behavior of these tubes.