Nesting Flowerpot / Sustainable design

Along with the growth of plants, capacity required for the pot is increasing and pots are needed to change every several months. However, improper repotting could lead to the death of plants. Therefore we designed a series of nesting pots, which are made of mud, straws and sticks. There are nutrient substance and fertilizer on the inner wall of every single pot.
supplement: Choosing the size of pots depends on the size of plants and their roots. This design meets the demand for plants in different growth stages. If a small pant is repotted into a relatively over-sized pot, it has a negative influence on roots respiration. Soil with high water