On Baylor Street the Treaty Oak has stood for centuries, and when it was poisoned in 1989 the whole city rallied to nurse it through — a measure of how deeply Austin loves its live oaks. Winter is when these trees ask for attention, because Central Texas oaks are safest to prune in the cold weeks, before oak wilt's risky season opens in February. Arbor Tree Care tends limbs and canopies in Austin, with lawn care for the ground beneath them. A clean cut at the branch collar, a crown opened to let the low January sun through, a tree left balanced for the storms of the coming year — that is tree work done with a steady hand. Look up along any shaded street here to see what such attention leaves behind.