Hosp Grove Park in Carlsbad preserves 53 acres of century-old eucalyptus forest on Jefferson Street across from Buena Vista Lagoon, tracing its origin to 1908 when nurseryman F.P. Hosp and the Hosp Eucalyptus Corporation planted over 40,000 trees across 219 acres with the intention of selling the timber as railroad ties to the Santa Fe Railroad. The eucalyptus proved too brittle for construction, and in 1986 the City of Carlsbad acquired the remaining acreage and established the park—a transformation from failed commercial venture to public asset now documented by the Carlsbad Historical Society. Two trail loops—the West Grove and East Grove, separated by Monroe Street—total approximately three miles of unpaved singletrack with 350 feet of cumulative elevation gain, offering views of Buena Vista Lagoon and the Pacific Ocean from the ridgeline. The West Grove trailhead includes a small playground, picnic tables, the Hi-Noon Rotary Picnic Area, and a "Mother Earth and Father Sky" sculpture near a boulder plaque dedicated to F.P. Hosp, while the East Grove features steeper climbs through a denser canopy favored by trail runners and mountain bikers. The grove's eucalyptus canopy also serves as habitat for migrating monarch butterflies and provides year-round shade that makes the trails a cooler alternative to exposed coastal routes—an asset promoted by the Carlsbad Chamber of Commerce as part of the city's 67-mile trail system. Leashed dogs are permitted on all trails, and the West Grove parking lot off Jefferson Street provides the primary access point 0.6 miles south of the Las Flores Drive exit from Interstate 5.