A 4-inch lip (the distance between the soil surface and the pot rim) creates a significant boundary layer of stagnant air that acts as a localized "dead zone" for humidity. This depth disrupts natural air circulation across the topsoil, leading to stagnant humidity and reduced transpiration.
Transpiration is the primary method by which vascular plants move water from the soil to the atmosphere, if it becomes limited or restricted then soil will remain saturated and in plastic pots growth stunt for a number of reasons.
it is scientifically accurate that when soil becomes saturated—meaning the pores are completely filled with water—oxygen moves roughly 10,000 times slower than in air-filled pores. This dramatic reduction in mobility often leads to an oxygen flux (the total amount of oxygen reaching plant roots) that is up to 320,000 times lower than in well-aerated, dry soil.
Doesn't matter how much perlite there is, its akin to locking out oxygen.
Soon as oxygen goes everything moves from aerobic to anaerobic, at drops dramatically, lactic acid is released slowly lowering ph acidic.
Low oxygen (hypoxia) in a growing medium creates anaerobic conditions that significantly alter nutrient availability, often leading to iron (Fe) deficiency, particularly in compacted or waterlogged soils. While waterlogging initially increases the solubility of iron (making it more available to the point of potential toxicity), the combination of low oxygen and oversaturation disrupts root respiration, which is essential for iron uptake.
Iron is absolutely critical for the synthesis of new chlorophyll, and its unavailability leads to a rapid, visible cessation of chlorophyll production, often manifesting within 52 hours of a severe iron-deficient environment. While iron is not a direct structural component of the chlorophyll molecule itself, it acts as an essential catalyst for the enzyme systems that build chlorophyll, generally why she goes light green.
Good luck.