Nematodes are not kept in stock year round.

Non-toxic proactive root weevil control. Contains 6 million predatory nematodes (Steinernema kraussei) and covers 130 square feet. Effective to temperatures down to 5°C. For use during early March as long as soil has risen to 5°C or above. Nematodes are microscopic and effective before weevils and other lawn pests hit their grub stage.