Threadleaf Coreopsis 'Zagreb' Characteristics
'Zagreb' are wildflowers that thrive in poor soils. They can be tolerant of heat, drought, and deer. Deadheading spent flowers can promote new fall blooms and prevent propagation via self seeding. Deadheading can be done by picking off individual flower heads or shearing the entire plant. Shearing will also help to keep the foliage tidy. They may spread by creeping roots that occasionally sprout a new plant.
There are few disease or insect issues that plague 'Zagreb'. Aster yellows and powdery mildew are uncommon. Slugs and snails may be occasional visitors. Rots may occur in poorly drained soils.