Thick Trunk Olive Tree - Fiber PotThick Trunk Olive Tree (Outdoor) Quick Care Guide Light & Water Prefers full sun for at least 6 hours a day. Water when the top 2 3 cm of soil is dry; allow the soil to dry out between waterings. Humidity Tolerates low humidity and prefers drier conditions. Maintenance Fertilize every 2 3 months during the growing season, prune to maintain shape and remove dead branches, and repot every 2 3 years if grown in a container.