A nursery in a river town learns quickly which plants can live with salt on the wind and which cannot. Brevard Nursery and Landscaping stocks that lesson in green, containers and flats of plants for Cocoa's sandy lots, and then carries them out into the yards as landscaping. There is something hopeful about a pot that becomes a garden: a young palm settled beside a porch, a row of shrubs that will soften a fence in a season or two, ground cover creeping out beneath an oak. In Cocoa, where breezes drift in off the Indian River Lagoon and the water turns pink at first light, a new planting has plenty of sky to grow toward. The work begins on the nursery bench and ends with a yard that looks as though it always meant to be there.