The Asteran will only hatch when the sunflower is fully grown so many owners keep the eggs in a safe part of their garden where a lot of sunlight can reach it. Even when the flower is not fully grown, the petals will open during the day and close during the night for protection which can confuse owners who do not know this.
A young Asteran loves to run. It will run around fields of flowers for hours and during this time the Asteran will help pollinate the sunflowers in the field. The sunflower on the Asteran's back helps provide some nutrients but not enough for the creature to survive so a daily meal is required to keep an Asteran healthy.
The Asteran will take a floret from the sunflower head and place it next to its owner. This is a sign that the Asteran loves the owner and the floret should be cherished greatly since the Asteran will only remove one in its lifetime.