Hauppauge rides the high middle of Long Island, where the ground opens into Blydenburgh and the Nissequogue begins as little more than seepage under the oaks. OPAL'S WEEDING SERVICE works close to that soil — weeding and clearing beds, mowing, trimming and edging, holding a firm border against sandy ground that will grow anything you allow it. Island summers are humid and generous; a bed left to itself in July is unrecognizable by mid-August. The reward is the moment a garden goes quiet again, mulch lines crisp and nothing volunteering where it should not be. It is patient work, and it shows from the sidewalk.