When a small forest preserve is surrounded by culture it becomes weedy, because the Biosphere requires that energy flow from simple, disturbed, and productive communities such as shrublands, yards, and gardens, into complex, energy-storing depots like forests. Escapees from cultivation and weedy natives such as greenbriar and poison ivy proliferate in disturbed spots, because they are long-distance invaders and rapid reproducers. Weedseep is accentuated in a narrow ravine, with a considerable porous edge relative to its interior, and trails that are invasion pathways for seeds inadvertently carried by people, pets, and wildlife. Chunks are better nature preserves. Today is my annual census of woody invaders along the preserve trail, and I try to eliminate as many exotics and trailside hazards as possible. The most insidious contaminant is Japanese honeysuckle along one-fifth of the trail, having doubled its coverage in the nine years since a sewer line was built creating bare earth receptive to invasion. Other exotic invaders are two loquats, twelve Chinese tallows, fourteen ligustrums, seventy-one nandinas, and over one hundred chinaberries. I yank seedlings and cut saplings, which will resprout but won't reseed for awhile, and I spray poison ivy and honeysuckle, because a corollary of the weedseep principle is that management is mandatory in island-like suburban wildlands.