Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The garden (Bustan) in a dream is the wife. Whatever good or bad happens in the garden reflects on her. Watering the garden indicates intimacy with the wife. An unknown garden is Paradise.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The garden indicates seeking forgiveness and repentance. Entering it for the unmarried is marriage, and for the sick, healing. A dry garden indicates a barren woman.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The garden is interpreted as a wife, wealth, a child, and a good life. Whoever sees himself strolling in a garden, his worry and grief will disappear.