A few desert plants have a waxy coating that helps protect them from the heat and dry air of the dessert. These plants include some varieties of Yucca trees, Creosote and Beavertail Cactus. The waxy coating blocks the plants pores, trapping the moisture inside to prevent them from drying out.
The desert does not have a waxy coating. Some plants in the desert do, however, to prevent loss of moisture.
The waxy coat helps to reduce water loss from the leaves.
Some desert plants secrete a waxy coating to help slow or prevent water loss.
Desert
No just slime coats
A cuticle is the waxy material that helps plants retain water.
Basically, to reduce the loss of water through their leaves. Some desert plants have a waxy coating on their leaves to do the same.
Lotus have waxy coating on the leaves to protect them from water.
That way the water doesn't get absorbed through the leaves first off and also to block some harmful UV rays
The waxy coating on leaves, known as the cuticle, prevents the leaves from drying out too quickly.
Leaves have a waxy coating called a cuticle to prevent excess water loss through transpiration. Without this coating they would dry up. The waxy layer blocks the stomata preventing as much water evaporating from them
Many plants have a waxy (hydrocarbon) coating. In some cases this appears to inhibit the loss of water. We can polish an apple, because we smooth out the waxy coating on its skin. With apples, it appears that the storage life of the apple is influenced by this coating. No doubt cabbages have a similar strategy.
Most xerophytic plants have waxy coating on epidermal cells of leaves to minimize water loss by transpiration. For this reason these plants also have sunken stomato gaurded by trichomes etc.