Female dragonflies can lay hundreds of eggs during their adult lives, in batches over a few days or even weeks. Eggs are laid either into plant material (endophytic eggs) or deposited loosely into water (exophytic eggs).he former are elongated, but the latter are rounded and laid in a jelly-like substance which confers some protection.All damselflies and the hawkers have scythe-like ovipositors and inject their eggs into plant stems or leaves, rotten wood or mud on or close to the surface of the water. Some damselflies submerge completely to lay their eggs, often using their still-attached partner to pull them up again afterwards. Emerald damselflies and Migrant Hawkers inject their eggs into rush stems well above the water surface