From Creatures Wikia
The Eggtree actually appears to be more of a parasitic plant than a tree at all; Eggtrees can be found growing on ledges and stumps in Norngarden 1. Each Eggtree produces only one flower at a time, which will eventually turn into a delicious fatty gourd that creatures recognize as food. Each gourd can be eaten in several bites. A potted version of this plant is also available for download from The Norngarden. The potted version of the Eggtree produces several food gourds at once, and is portable.
The original Eggtree is an integral part of Norngarden 1.