The 'Princeton Sentry' Ginkgo (Ginkgo biloba 'Princeton Sentry') is a male, fruitless cultivar known for its narrow, upright, and columnar form, maturing to 40–65 feet tall and 15–20 feet wide. It is a durable, low-maintenance, and "living fossil" tree, ideal for urban settings due to high tolerance for pollution, drought, compacted soil, and salt. Its distinct fan-shaped, dark green foliage turns a bright, uniform golden yellow in autumn. 
Key Characteristics & Overview
Form: Columnar to narrowly conical, making it ideal for tight spaces, street-side planting, or as a vertical accent.
Foliage: Deciduous, with distinctive, fan-shaped leaves.
Fall Color: Highly regarded for its intense, brilliant yellow foliage.
Fruit: This is a male clone, meaning it does not produce the messy, foul-smelling fruit associated with female ginkgos.
Growth Rate: Slow to moderate.
Hardiness Zones: Generally hardy in USDA zones 3-8. 
Planting and Care
Sunlight: Full sun is required (6+ hours).
Soil: Highly adaptable to various soil conditions, including clay, sand, and alkaline soil, but prefers well-drained soil.
Maintenance: Low maintenance; rarely needs pruning and is resistant to pests and diseases.
Watering: Drought-tolerant once established, but prefers regular water in its youth. 
Landscape Uses
Due to its vertical, tidy habit, the 'Princeton Sentry' is an excellent choice for urban landscapes, city parkways, narrow lots, and as a formal accent tree.