pussy willow
Salix discolor

Hardiness: Zones 4 to 8 
Plant type: Shrub
Height: 6- 15'
Spread: 4- 12'
Sun: Full sun to part shade
Water: Medium to wet
Bloom time: March, April
Bloom color: yellowish green
Soil: Moist, well-draining, loamy, sandy or clay soils.

More information on this plant here.