Down in Mission Valley, past the hotels and the trolley line, the San Diego River still threads a green corridor through the city, and in spring its sycamores leaf out in broad, pale hands while egrets stalk the shallows below. It is a reminder that this sunny city grows big trees fast once they find water. Big Branch Tree Service puts the work right in its name: the heavy limbs that reach across a yard, the boughs leaning toward a roofline, the canopy that has outgrown its space. Across San Diego, the job is trimming and pruning with a clear eye for how each limb carries its weight, so a tree stays sound and the ground beneath it opens up. On a warm spring afternoon, with a newly pruned crown scattering coins of light across the grass, a yard can feel twice its size.