Down at Rexford the Mohawk widens and slows, and on a summer evening the water goes the color of a pearl held up to a lamp. Pearl Landscaping & Patio Company keeps the yards that climb the bank above the river and the flatter lots inland toward Grooms Road. The work is mowing, trimming and holding the bed lines sharp, on a rhythm that opens when the forsythia breaks and closes when the last oak leaf is off the grass. A property looked after all season carries a settled look you notice from the street without quite knowing why. Pearl serves Clifton Park, Rexford, Niskayuna, Vischer Ferry and Halfmoon.