Forsythia 'Gold Tide'
This ground-cover type forsythia from France has a compact, ground-hugging habit, excellent for mass plantings. It blooms with a lemon-yellow flower in early spring, prefers full sun to light shade, and moist, well-drained soils - it is not tolerant of dry soils. The plant itself is hardy to zone 4. However, the flower buds will need adequate snow cover in zone 4 for consistent spring bloom.