Simple Guide to Growing a Pineapple in Water 1 Pick a healthy pineapple Choose one with fresh, firm green leaves. Avoid any with yellowing or damaged foliage. 2 Prepare the crown Twist off the leafy top and remove a few bottom leaves to expose 23 cm of stem. 3 Place in water Submerge only the stem in a glass of water, keeping the leaves dry. Put it in a sunny spot for 68 hours of light daily, and change the water every 23 days. 4 Wait for roots to grow Once the roots reach about 710 cm, its ready to be moved into soil. 5 Transplant and care Plant the crown in a 30 cm pot with well-draining soil, water generously, and keep it in a sunny location. Maintain regular watering. With a little patience, youll enjoy watching your pineapple grow and one day, taste a fruit you grew yourself.