Chamaecyparis pisifera is the botanical name of threadleaf cypress mops.
Mops are dwarf threadleaf or Filiform variants with scale-like needles adhering to the branches. There are also larger threadleaf cultivars of the same species.
This cypress has golden weeping foliage and prefers well-drained soil and full sun or part shade (deeper shade may cause the foliage to turn green instead of golden). Its height at 7 years is listed at 5-10' and at 20 years a maximum of 15'.