- Name: Giant Sequoia - Other Common Names: Giant Redwood / Sierra Redwood / Big Tree - Scientific Name: Sequoiadendron Giganteum - Color: Yellow - Reddish Male Flowers Turning To Brown - Plant Seeds: Fall Sow / Cold Stratify / Early Spring - Bloom Time: Spring - Hardiness Zone: 6 - 8 - Plant Height: 60 - 275' - Plant Spacing: 25 - 60' - Light Requirements: Sun - Part Shade - Soil & Water Preferences: Average - Quantity: 40 Seeds - Other: The Giant Sequoia Is Truly A Giant. They Are The Largest Trees In The World, & The Largest Living Things By Volume. Giant Sequoias Can Grow To An Average Height Of 150 – 280 Feet Tall With A Diameter Of 20 – 25 Feet. The Largest Tree On Record Is 311 Feet Tall, & The Widest Is 27 Feet In Diameter.