"Snowlogging" is a mechanic in Bedrock Edition that allows layers of snow to occupy the same block space as certain types of vegetation.
Process
Only some plants are capable of being snowlogged. They can be snowlogged by placing a snow layer inside an existing plant block. It is worth noting that, unlike waterlogging, this cannot be done in reverse, as placing a plant in an existing snow layer will delete said snow layer.[1]
Snowloggable plants
Only 1-block-high plants are snowloggable; 2-block-high plants, such as sunflowers and tall grass, are not snowloggable. Of the 1-block high plants, flowers, mushrooms, grass, and ferns are snowloggable. Bamboo saplings, beetroot crops, carrot crops, dead bush, melon stems, potato crops, pumpkin stems, sapling, and sugar cane are not snowloggable.