Regarding this, which plant has waxy coating on leaves?
The wax plant has thick, waxy leaves that are sometimes variegated. Peperomias are small plants with thick, waxy leaves, and may vary greatly in leaf size and shape with an upright to mounding habit. The popular jade plant (Crassula spp.) produces thick, succulent, waxy leaves; some variegated varieties are available.
Subsequently, question is, why do desert plants need the waxy coating on their leaves to survive? The leaves and stems of many desert plants have a thick covering that is coated with a waxy substance, allowing them to seal in and protect what moisture they already have. The smaller or fewer leaves a plant has, the less water is lost during transpiration since it has less surface area open to the sun and wind.
Keeping this in consideration, why do plants need a waxy layer on their leaves?
However, in plants that grow in very hot or very cold conditions, the epidermis may be several layers thick to protect against excessive water loss from transpiration. A waxy layer known as the cuticle covers the leaves of all plant species. The cuticle reduces the rate of water loss from the leaf surface.
What will happen if Lotus leaves do not have a waxy coating on them?
Water would enter the plant through the stomatal pores. This killing the plant.