Little Dripleaf can be a rare item found in Minecraft. For Minecraft 1.17, the only way to get this item is to talk to Wandering Trader. They are willing to offer you a single emerald per item and you will get two of them that you can build on specific blocks, namely clay and moss. You can also place them on blocks of dirt, farmland, grass and podzols, but these must be underwater, unlike clay and moss.
Although the Little Dripleaf is considered a plant and looks like a vine, it does not grow when you place it on top of a block. Even if you place it on blocks that have it under water. The Little Dripleaf does not have a natural growth cycle and no matter how long you wait, it will never change in the next phase, the Great Dripleaf. The only way to let it grow is to feed the bone meal instead. Once he receives the bone meal, it immediately becomes a Big Dripleaf and you can use it to reach higher places where you would normally have difficulty reaching.
There are also no seeds or initial forms for little Dripleaf. You can only find them from Wandering Traders or by obtaining them from Lush Caves, which have not yet been launched in Minecraft. They will grow naturally in these biomes.