Linden Tree: Greenspire™Tilia cordata 'Greenspire' As their name suggests, Greenspires have a very narrow, dense head with an oval crown. Small glossy dark green heart shaped leaves change to yellow in the fall. They bear fragrant pale yellow flowers in late spring. They can be used for street tree plantings, as specimens, or for lawns. Features: Height: 16 18m tall, 10 12m wide Sun Exposure: Full sun Soil Type: Moist to average, well drained Soil pH: Slightly acidic Zone: 3