Complex sentence: Seedlings are grown in containers but are more prone to damping off than other eucalypts; they are highly susceptible to "Phytophthora cinnamomi" and "P. nicotinianae" Young plants are generally planted out once they are 8 or 9 months old.
Split into simpler sentences: Seedlings are grown in containers but are more prone to damping off than other eucalypts. They are generally planted out once they are 8 or 9 months old.