Mid-May in Bound Brook smells like lilac and cut grass, and the small front lawns on the older streets look their best of the whole year. Royal Gardens Landscape works to keep them that way — mowing on a regular week, hedges and borders trimmed to a clean line, beds edged and mulched so the green reads sharper against the dark. Front yards here are modest in size and generous in effect, and the details are the difference. What the seasons drop gets cleared, spring and fall. Nothing shouts, and everything is in order.